Title 24 · California Energy Code
What compliance software is allowed and how is it certified?
Summary: For any project using the Title 24 performance path you must use Energy Commission‑approved (Commission‑certified) compliance software — the software simulates both the proposed and standard designs, calculates LSC and/or Source Energy, and produces the Certificate of Compliance outputs required by **§ 10-109** and **§ 10-116**.
Last reviewed: July 6, 2026
What the code requires — 2-4 sentences
The performance (energy‑budget) compliance path must be demonstrated using Commission‑certified compliance software — i.e., COMPLIANCE SOFTWARE approved under § 10-109 and used as specified in § 10-116. The same software must simulate both the Proposed Design Building and the Standard Design Building, calculate Long‑Term System Cost (LSC) and/or Source Energy, and produce the Certificate of Compliance outputs required by Part 6. See § 10-109 and § 10-116 for the statutory approval/certification requirements and modeling rules .
The single most important rule: use only Energy Commission‑approved / Commission‑certified compliance software to run both the proposed and standard design simulations — that approval is required by § 10-109 and § 10-116.
Requirements in detail
Which software is allowed (short)
- Allowed software = COMPLIANCE SOFTWARE that has been approved or certified by the California Energy Commission pursuant to § 10-109 (approval) and used as required in § 10-116 (modeling rules). The code defines COMPLIANCE SOFTWARE as software approved under § 10-109.
What certified software must do (functions & outputs)
- Simulate the Proposed Design Building and the Standard Design Building, using the same geometry and orientation, producing energy budget outputs in LSC and/or Source Energy as applicable. This is required wherever the performance approach is used (residential, nonresidential, multifamily) per the performance sections that reference § 10-109(c) and § 10-116.
- Produce the Certificate of Compliance documentation and specific LSC outputs required for permit submittal (for example, LSC rating must be included in Certificate of Compliance for some voluntary measures). See A4.203.1.1 for an example requirement to include the LSC rating in the Certificate of Compliance.
- Apply the Commission’s modeling rules for “existing efficiency level” and altered components when the project is an addition/alteration — those rules are described in § 10-109(c) and § 10-116 and must be implemented by the compliance software.
Who certifies / approves (process overview from code text)
- The California Energy Commission is the approving/certifying authority for compliance software under § 10-109 and the modeling rules in § 10-116; software must be listed or otherwise designated by the Commission to be used for Title 24 Part 6 compliance. The code repeatedly ties the performance compliance approach to use of Commission‑certified compliance software under § 10-109 and § 10-116. The detailed procedural steps for submission/testing are set by the Commission (not fully reproduced in the retrieved excerpts).
When you must use Commission-certified software
- Anytime the project uses the performance approach (energy budgets) — new construction or where the code requires performance compliance — the calculations must be done with Commission‑certified/approved compliance software as specified in § 10-109(c) and § 10-116. This applies across Sections 140.1, 150.1, 170.1 and analogous performance sections that reference those code sections.
Decision table — decision‑relevant dimensions and values
| Decision dimension | Required / Allowed value | Code Reference |
|---|---|---|
| Which software may be used for performance path | Only Commission‑approved / Commission‑certified compliance software | § 10-109 and § 10-116 |
| What the software must simulate | Proposed Design Building and Standard Design Building (same geometry/orientation) | § 10-109(c); performance sections referencing § 10-116 |
| Required outputs | Long‑Term System Cost (LSC) and/or Source Energy budgets and Certificate of Compliance data | Performance sections and LSC calculation/definitions (Reference: Section 100.2 and performance sections) |
| Alterations / existing components | Use the “existing efficiency level” modeling rules as described in § 10-109(c) and § 10-116 | § 10-109(c) and § 10-116 (see Section 150.2 notes) |
| Certification authority | California Energy Commission | § 10-109 (approval/certification) |
| Exceptions or offsets (community/shared systems) | Community shared systems may be approved to offset LSC/EDR by § 10-115 methods | § 10-115 referenced in performance sections (A4/170/140 notes) |
(Each Code Reference above points to where the code ties use of compliance software to Commission approval/certification and to the specific modeling or output requirements.)
Exceptions & special cases
- Community shared solar or community shared BESS can offset certain LSC or Energy Design Rating credits, but those community options must themselves be approved by the Commission per § 10-115; the performance sections refer to this exception when describing allowable offsets. This is a special case, not a substitute for using certified compliance software.
- Programming libraries used by DDC controllers must be certified to the Energy Commission when the Standard requires certified libraries (see Section 140.4(r)3); nonprogrammable/configurable controllers may be excepted. This shows that the Commission‑certification concept applies to software libraries too.
- For additions and alterations, the standard‑design altered‑component rules require use of existing efficiency level modeling rules as set out by § 10-109(c) and § 10-116; compliance software must implement these rules for the standard design in alteration projects.
If you need the step‑by‑step test procedures, submission forms, or the current Commission listing of certified software, those procedural details and the certified‑software list are maintained by the Energy Commission and are not fully reproduced in the retrieved text excerpts here.
Common mistakes
- Using non‑certified or home‑grown simulation tools for the performance path — the code requires Commission approval/certification: do not submit results from unapproved software. § 10-109 and § 10-116 require certified software for performance compliance.
- Failing to simulate both the Standard Design and Proposed Design in the same software or failing to use identical geometry/orientation assumptions for both simulations (the standard design is simulated with the same geometry/orientation). See the definition of Standard Design Building and the performance sections referencing § 10-109(c) and § 10-116.
- Not including required outputs (for example, LSC values or LSC rating) in the Certificate of Compliance when the code or appendix requires it (see A4.203.1.1 for an LSC requirement tied to compliance documentation).
- For alterations, misapplying the “existing efficiency level” rules — if the project is an alteration, the software must apply the existing‑component rules described in § 10-109(c) and § 10-116.
Worked example — concrete scenario
Scenario: new small office building — performance path demonstration.
Situation: Proposed Design simulated in Commission‑certified software produces:
- Annual Proposed LSC = 92 LSC units (illustrative)
- Annual Source Energy = 18,000 kBtu (illustrative)
Standard Design: same building geometry/orientation simulated by the same Commission‑certified software (standard design assumptions per code) produces:
- Annual Standard Design LSC = 100 LSC units (illustrative)
Result: Because Proposed LSC (92) ≤ Standard Design LSC (100), the building meets the LSC energy budget on the performance path. The permit submittal must include the Certificate of Compliance outputs produced by the Commission‑certified compliance software (the LSC values and required supporting reports). The software used to generate those numbers must be approved/certified under § 10-109 / § 10-116; otherwise the submittal will be rejected. The LSC calculation methodology itself is defined in the code (LSC multiplication by hourly factors, etc.), and compliance software implements those calculations.
Note: the numeric values above are illustrative to show the workflow — actual LSC budgets and numeric thresholds depend on Commission tables, climate zone, and building type as implemented in certified software. The key compliance requirement is use of Commission‑certified tools to produce and submit the results.
Related provisions (direct cross‑references)
- § 10-109 — Approval/certification of compliance software (see definition and repeated references)
- § 10-116 — Modeling rules and application to standard/proposed design simulations (referenced by performance sections)
- § 100.2 — Calculation of Energy Budgets and LSC definition (how LSC is computed; supports what the software must calculate)
- § 150.1(b) — Performance approach for single‑family residential: ties required use of Commission‑certified software to demonstrating compliance
- § 140.1 — Performance approach for nonresidential/hotel: requires Commission‑certified compliance software (references § 10-109(c) and § 10-116)
- § 170.1 — Performance approach for multifamily: same requirement to use Commission‑certified software
- § 10-115 — Approval pathway for community shared solar/BESS (used as special‑case offsets) referenced in performance sections
If you want, I can:
- Pull the current Energy Commission listing of approved/certified compliance software and describe how to confirm a given tool is accepted for the 2025 standards; or
- Draft the checklist of outputs and files you must attach to a building‑permit application when you submit results from a specific certified tool.
Code references
Grounded in the retrieved California Energy Code — click a citation to read the verbatim passage:
§ 203.1.1 High relevance — show source text
A4.203.1.1 Long-term system cost (LSC). LSC rating for the building’s Proposed Design shall be computed by Compliance Software certified by the Energy Commission as specified in Title 24, Part 6, Section 100.1 and 150.1(b), and shall reduce the LSC required in the Compliance Software for minimum performance-based compliance with the California Energy Code by the compliance margin specified in Table A4.203.1.1. The rating shall be included in the Certificate of Compliance documentation.
TABLE A4.203.1.1—RECOMMENDED LSC MARGINS BY CLIMATE ZONES Col2 CALIFORNIA ENERGY CODE CLIMATE ZONE TOTAL LSC COMPLIANCE MARGIN 1 2.70 2 1.62 3 1.10 4 1.11 5 1.01 6 0.24 7 0.24 8 0.21 9 0.20 10 0.18 11 1.11 12 1.05 13 0.96 14 1.21 15 0.59 16 1.68 Note: Community shared options complying with Title 24, Part 1, Section 10-115 may be used to achieve LSC targets. Note: Community shared options complying with Title 24, Part 1, Section 10-115 may be used to achieve LSC targets. 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE APPENDIX A4-9
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APPENDIX A4 — RESIDENTIAL VOLUNTARY MEASURES
A4.203.1.2 Prerequisite options. In addition, a minimum of TWO of the efficiency measures specified in Sections A4.203.1.2.1 through A4.203.1.2.7 must be met.
A4.203.1.2.1 Roof deck insulation, or ducts in conditioned space. Meet one of the three options for the location of ducts and air handlers as well as insulation R -values and installation of a radiant barrier as specified in Title 24, Part 6, Section 150.1(c)9A or B:
Below roof deck insulation with a minimum R -value of 19; or,
Continuous above deck insulation with a minimum R-8 and with an air space present between the roofing and the roof deck; or,
All ducts and air handlers in conditioned space as specified in the Title 24, Part 6, Reference Appendix RA3.1.
A4.203.1.2.2 High performance walls. Meet the climate zone dependent U -factor or insulation R -value for either 2x6 or 2x4 framing as specified in Title 24, Part 6, Section 150.1(c)1B: maximum U -factor of 0.048.
A4.203.1.2.3 Compact hot water distribution system. Meet the requirements for installation of Compact Hot Water Distribution Systems specified in the Title 24, Part 6, Reference Appendix RA3.6.5.
§ 201.1 High relevance — show source text
SECTION A4.201—GENERAL
A4.201.1 Scope. For the purposes of mandatory energy efficiency standards in the California Building Standards Code (Title 24), the California Energy Commission will continue to adopt mandatory standards in the California Energy Code (Title 24, Part 6). It is the intent of these voluntary provisions to encourage local jurisdictions through codification to achieve exemplary performance in the area of building energy efficiency. Local jurisdictions adopting these voluntary provisions as mandatory local energy efficiency standards shall submit the required application and receive the required approval of the California Energy Commission in compliance with Title 24, Part 1, Section 10-106 prior to enforcement. Once the required filing has been verified and finding has been made by the Energy Commission, local jurisdictions shall file an ordinance expressly marking the local modification along with findings and receive the required acceptance from the California Building Standards Commission in compliance with Section 101.7 of this code, prior to enforcement. (Title 24, Part 1, Section 10-106 is available at https://www.energy.ca.gov/programs-and-topics/programs/build- ing-energy-efficiency-standards/2025-building-energy-efficiency
SECTION A4.202—DEFINITIONS
A4.202.1 Definitions. The following terms are defined in Chapter 2.
ENERGY BUDGET.
LONG-TERM SYSTEM COST (LSC).
RECOVERED ENERGY, ON-SITE.
SOLAR POOL HEATING SYSTEM.
SECTION A4.203—PERFORMANCE APPROACH FOR NEWLY CONSTRUCTED BUILDINGS
A4.203.1 Energy efficiency. Newly constructed low-rise residential buildings shall comply with Sections A4.203.1.1 through A4.203.1.4.
A4.203.1.1 Long-term system cost (LSC). LSC rating for the building’s Proposed Design shall be computed by Compliance Software certified by the Energy Commission as specified in Title 24, Part 6, Section 100.1 and 150.1(b), and shall reduce the LSC required in the Compliance Software for minimum performance-based compliance with the California Energy Code by the compliance margin specified in Table A4.203.1.1. The rating shall be included in the Certificate of Compliance documentation.
TABLE A4.203.1.1—RECOMMENDED LSC MARGINS BY CLIMATE ZONES Col2 CALIFORNIA ENERGY CODE CLIMATE ZONE TOTAL LSC COMPLIANCE MARGIN 1 2.70 2 1.62 3 1.10 4 1.11 5 1.01 6 0.24 7 0.24 8 0.21 9 0.20 10 0.18 11 1.11 12 1.05 13 0.96 14 1.21 15 0.59 16 1.68 Note: Community shared options complying with Title 24, Part 1, Section 10-115 may be used to achieve LSC targets. Note: Community shared options complying with Title 24, Part 1, Section 10-115 may be used to achieve LSC targets. 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE APPENDIX A4-9
§ 204.1 High relevance — show source text
** Buildings complying with the second level of advanced energy efficiency shall have an Energy Budget that is no greater than indicated below, depending on building type and the type of energy systems included in the building project. If the newly constructed building or addition does not include indoor lighting or mechanical systems, then no additional performance requirements above Title 24, Part 6 are required.
- For nonresidential building projects that include indoor lighting or mechanical systems, but not both: No greater than 90 percent of the Title 24, Part 6, Energy Budget for the Standard Design Building as calculated by compliance software certified by the Energy Commission.
- For nonresidential building projects that include indoor lighting and mechanical systems: No greater than 85 percent of the Title 24, Part 6, Energy Budget for the Standard Design Building as calculated by compliance software certified by the Energy Commission.
- For high-rise residential and hotel/motel building projects: No greater than 95 percent of the Title 24, Part 6, Energy Budget for the Standard Design Building as calculated by compliance software certified by the Energy Commission.
Note: For Energy Budget calculations, high-rise residential and hotel/motel buildings are considered nonresidential buildings.
SECTION A5.204—MANDATORY REQUIREMENTS FOR ALTERATIONS TO EXISTING BUILDINGS
A5.204.1 Energy efficiency . Alterations to existing nonresidential buildings shall comply with Section A5.204.1.1.
A5.204.1.1 Altered pool and/or spa heating for existing nonresidential buildings . Alteration of existing nonresidential pool and/or spa heating system shall meet the following.
Heating source sizing. Heating systems or equipment for pools or spas shall meet one of the sizing requirements of Items 1 through 5 below:
- Solar pool heating system with a solar collector surface area that is equivalent to 65 percent or greater of the surface areas of the pool or spa or a combination of both respectively; or
- A heat pump pool heater as the primary heating system that meets the sizing requirements of Reference Joint Appendix JA16.3. The control for the heat pump pool heater shall meet the requirements specified in Section 110.4(d). The supplementary heater can be of any energy source; or
- A heating system that derives at least 60 percent of the annual heating energy from on-site renewable energy or on-site recovered energy; or
- A combination of a solar pool heating system and heat pump pool heater without any additional supplementary heater;
or
- A pool heating system determined by the Energy Commission Executive Director to use no more energy than the systems specified in Item 1, 2, 3, or 4 above.
Exception 1 to A5.204.1.1: Portable electric spas compliant with 20 CCR, Section 1605.3(g)(7) of the Appliance Efficiency Regulations.
Exception 2 to A5.204.1.1: A pool or spa that is heated solely by a solar pool heating system without any supplementary heater.
Exception 3 to A5.204.1.1: An existing building with inadequate Solar Access Roof Area (SARA) as specified in Section 140.10(a) for a solar pool heating system to be installed.
Exception 4 to A5.204.1.1: Heating systems which are used exclusively for permanent spa applications in existing buildings with gas availability.
SECTION A5.211—RESERVED
SECTION A5.212—ELEVATORS, ESCALATORS AND OTHER EQUIPMENT
§ 2.0 High relevance — show source text
B. Certified to the Energy Commission as being capable of responding to a demand response signal from a certified OpenADR 2.0b or a certified Baseline Profile OpenADR 3.0 Virtual End Node by automatically implementing the control functions requested by the Virtual End Node for the equipment it controls. 2. All demand responsive controls shall be capable of communicating with the VEN using a wired or wireless bidirectional communication protocol.
Reserved.
When the demand response signal is disabled or unavailable, all demand responsive controls shall continue to perform all other control functions provided by the control.
Demand responsive control thermostats shall comply with Reference Joint Appendix 5 (JA5), Technical Specifications for Occupant Controlled Smart Thermostats. (b) Demand Responsive Zonal HVAC Controls. Nonresidential HVAC systems with DDC to the Zone level shall be programmed to allow centralized demand shed for noncritical zones as follows:
The controls shall have a capability to remotely increase the operating cooling temperature set points by 4 degrees or more in all noncritical zones on signal from a centralized contact or software point within an Energy Management Control System (EMCS).
The controls shall have a capability to remotely decrease the operating heating temperature set points by 4 degrees or more in all noncritical zones on signal from a centralized contact or software point within an EMCS.
The controls shall have capabilities to remotely reset the temperatures in all noncritical zones to original operating levels on signal from a centralized contact or software point within an EMCS.
The controls shall be programmed to provide an adjustable rate of change for the temperature increase, decrease, and reset.
The controls shall have the following features: A. Disabled. Disabled by authorized facility operators; and B. Manual control. Manual control by authorized facility operators to allow adjustment of heating and cooling set points globally from a single point in the EMCS; and C. Automatic Demand Shed Control. Upon receipt of a demand response signal, the space-conditioning systems shall conduct a centralized demand shed, as specified in Sections 110.12(b)1 and 110.12(b)2, for noncritical zones during the demand response period.
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ALL OCCUPANCIES—MANDATORY REQUIREMENTS FOR THE MANUFACTURE, CONSTRUCTION AND INSTALLATION OF SYSTEMS, EQUIPMENT AND BUILDING COMPONENTS
(c) Demand Responsive Lighting Controls. Buildings with nonresidential lighting systems having a total installed lighting power of 4,000 watts or greater that are subject to the requirements of Section 130.1(b) or 160.5(b)4B shall install controls that are capable of automatically reducing lighting power in response to a demand response signal.
- For compliance testing, the lighting controls shall demonstrate a 15-percent or greater reduction in lighting power as described in NA7.6.3. The controls may provide additional demand responsive functions or abilities.
- For buildings where demand response controls are required, demand responsive controls shall control the general lighting in the spaces required to meet Section 130.1(b) or 160.5(b)4B.
- General lighting shall be reduced in a manner consistent with the requirements of Section 130.1(b) or 160.5(b)4B. Exception to Section 110.12(c): Spaces where a health or life safety statute, ordinance, or regulation does not permit the general lighting to be reduced are not required to install demand responsive controls and do not count toward the 4,000-watt threshold.
§ 409.2.3 High relevance — show source text
Software used to conduct the whole building life cycle assessment, including reference baseline building, shall have a data set compliant with ISO 14044, and ISO 21930 or EN 15804, and the software shall conform to ISO 21931 and/or EN 15978. The software tools and data sets shall be the same for evaluation of both the baseline building and the proposed building.
Exception: For projects that include building reuse, the reference baseline building shall not be of new construction and shall retain existing materials. The percent reduction in GWP shall be achieved through the design and construction of new project elements.
A5.409.2.3 Verification of compliance. A summary of the GWP analysis produced by the software and Worksheet WS-7 signed by the design professional of record shall be provided in the construction documents as documentation of compliance. A copy of the whole building life cycle assessment which includes the GWP analysis produced by the software, in addition to maintenance and training information, shall be included in the operation and maintenance manual and shall be provided to the owner at the close of construction. The enforcing agency may require inspection and inspection reports in accordance with Sections 702.2 and 703.1 during and at completion of construction to demonstrate substantial conformance. Inspection shall be performed by the design professional of record or third party acceptable to the enforcing agency.
A5.409.3 Product GWP compliance—prescriptive path. Each product that is permanently installed and listed in Table A5.409.3 shall have a Type III environmental product declaration (EPD), either product-specific or factory-specific.
Exception: Concrete may be considered one product category to meet compliance with this section. A weighted average of the maximum GWP for all concrete mixes installed in the project shall be less than the weighted average maximum GWP allowed per Table A5.409.3 using Exception Equation A5.409.3.1. Calculations shall be performed with consistent units of measurement for the material quantity and the GWP value. For the purposes of this exception, industry-wide EPDs are acceptable.
Exception EQUATION A5.409.3.1
GWP n < GWP allowed
where
GWP n = Σ (GWP n )(v n ) and GWP allowed = Σ (GWP allowed )(v n )
and
n = each concrete mix installed in the project GWP n = the GWP for concrete mix n per concrete mix EPD, in kg CO 2 e/m [3]
GWP allowed = the GWP potential allowed for concrete mix n per Table 5.409.3 v n = the volume of concrete mix n installed in the project, in m [3]
APPENDIX A5-30 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE
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APPENDIX A5 — NONRESIDENTIAL VOLUNTARY MEASURES
|TABLE A5.409.3—PRODUCT GWP LIMITS,
§ 100.2 High relevance — show source text
SECTION 100.2—CALCULATION OF ENERGY BUDGETS
Energy budgets are adopted by the Commission to establish the maximum energy consumption that a proposed building, or portion of a building, can be designed to consume. A building complies with the performance standards compliance approach if the energy consumption calculated for the proposed design building is no greater than the energy budget calculated for the standard design building using Commission-certified compliance software as specified by the Alternative Calculation Methods Reference Manual. The energy budget for newly constructed single-family, multifamily, and nonresidential buildings are expressed in terms of Long-Term System Cost (LSC) and Source Energy. The energy budget for additions and alterations for all building types are expressed in terms of LSC.
Long-term System Cost (LSC) is calculated by multiplying for each hour of the year the site energy use (electricity kWh, natural gas therms, or fuel oil or LPG gallons) for each energy type by the applicable CEC-published LSC hourly factors. LSC hourly factors vary for each hour of the year and by energy type (electricity, natural gas, or propane), by Climate Zone and by building type (residential, nonresidential). LSC hourly factors are summarized in Reference Joint Appendix JA3. LSC hourly factors for propane are used for all energy obtained from depletable sources other than electricity and natural gas.
Source Energy is calculated by multiplying for each hour of the year the site energy use (electricity kWh, natural gas therms, or fuel oil or LPG gallons) by Btu factors for fossil fuel consumed either directly at the building site or caused to be consumed to meet the electrical demand of the building considering the long-term marginal hourly resources of Commission-projected electric system resource procurement.
Note: Authority: Sections 25213, 25218, 25218.5, 25402 and 25402.1, Public Resources Code . Reference: Sections 25007, 25008, 25218.5, 25310, 25402, 25402.1, 25402.4, 25402.5, 25402.8 and 25943, Public Resources Code .
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ALL OCCUPANCIES—GENERAL PROVISIONS
FIGURE 100.1-A CALIFORNIA CLIMATE ZONES
Climate Zones for Residential and Nonresidential Occupancies
2025 CALIFORNIA ENERGY CODE 37
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2 ALL OCCUPANCIES—MANDATORY REQUIREMENTS FOR THE
MANUFACTURE, CONSTRUCTION AND INSTALLATION OF SYSTEMS, EQUIPMENT AND BUILDING COMPONENTS
SECTION 110.0—SYSTEMS AND EQUIPMENT—GENERAL
Sections 110.1 through 110.12 specify requirements for manufacturing, construction and installation of certain systems, equipment, appliances and building components that are installed in buildings within the scope of Section 100.0(a).
Note: The requirements of Sections 110.0 through 110.12 apply to newly constructed buildings. Sections 141.0 and 150.2 specify which requirements of Sections 110.1 through 110.12 also apply to additions and alterations to existing buildings.
§ 170.0 High relevance — show source text
Exception to Section 170.0 (a)3: If a single development falls in more than one climate zone, all buildings in the subdivision or tract may be designed to meet the performance or prescriptive standards for the climate zone that contains 50 percent or more of the dwelling units.
NOTE: The Commission periodically updates, publishes and makes available to interested persons and local enforcement agencies precise descriptions of the climate zones, as specified in Reference Joint Appendix JA2—Weather/Climate Data.
NOTE: The requirements of Sections 170.1(a) through 170.2(e) apply to newly constructed buildings and Sections 180.1 and 180.2 specify changes to the requirements of Sections 170.1(a) through 170.2(e) that apply to additions or alterations.
NOTE: Authority: Sections 25213, 25218, 25218.5, 25402 and 25402.1, Public Resources Code . Reference: Sections 25007, 25008, 25218.5, 25310, 25402, 25402.1, 25402.4, 25402.5, 25402.8 and 25943, Public Resources Code .
SECTION 170.1—PERFORMANCE APPROACH
A building complies with the performance approach if the energy consumption calculated for the proposed design building is no greater than the energy budget calculated for the standard design building using Commission-certified compliance software as specified by Sections 10-109 and 10-116 and the Alternative Calculation Method Reference Manual.
(a) Energy budget. The energy budget is expressed in terms of long-term system cost (LSC) and source energy:
- Long-term system cost (LSC). The LSC energy budget is determined by applying the mandatory and prescriptive requirements of the standard design to the proposed design building and has two components, the Efficiency LSC and the Total LSC.
A. The Efficiency LSC energy is the sum of the LSC energy for space-conditioning, water heating, mechanical ventilation, lighting and the self-utilization credit. B. The Total LSC energy is the sum of the Efficiency LSC energy and LSC energy from the photovoltaic system, battery energy storage systems (BESS), and demand flexibility. 2. Source energy. The source energy budget is determined by applying the mandatory and prescriptive requirements of the standard design, except with a consumer gas or propane water heater, to the proposed design building.
Exception to Section 170.1(a): A community shared solar electric generation system, or other renewable electric generation system, and/or community shared BESS, that provides dedicated power, utility energy reduction credits or payments for energy bill reductions to the permitted building and is approved by the Energy Commission as specified in Title 24, Part 1, Section 10-115, may offset part or all of the solar electric generation system or BESS LSC energy required to comply with the standards, as calculated according to methods established by the Commission in the Nonresidential ACM Reference Manual.
(b) Compliance demonstration requirements for performance standards.
- Certificate of Compliance and Application for a Building Permit. The application for a building permit shall include documentation pursuant to Sections 10-103(a)1 and 10-103(a)2 that demonstrates, using an approved calculation method, that the building has been designed so that its source energy and LSC energy consumption do not exceed the standard design energy budgets for the applicable climate zone.
- Field verification of individual dwelling unit systems.
§ 2.5. Medium relevance — show source text
ii. Temperature maintenance tank. Meet one of the following: A. The electrical power required to power a HPWH system temperature maintenance tank that meets the total building hot water demand as calculated and documented by the responsible person associated with the project. B. The electrical power required that meets the requirements specified for the temperature maintenance tank in Joint Appendix JA15.2.5.
NOTE: Authority: Sections 25213, 25218, 25218.5, 25402 and 25402.1, Public Resources Code . Reference: Sections 25007, 25008, 25218.5 25310, 25402, 25402.1, 25402.4, 25402.5, 25402.8 and 25943, Public Resources Code .
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11 MULTIFAMILY BUILDINGS—PERFORMANCE
AND PRESCRIPTIVE COMPLIANCE APPROACHES
SECTION 170.0—GENERAL
Multifamily buildings shall comply with the applicable requirements of Sections 170.0 through 170.2. Sections 170.0 through 170.2 apply to dwelling units and common use areas in multifamily buildings. Nonresidential occupancies in mixed occupancy buildings shall comply with nonresidential requirements in Sections 120, 130, 140 and 141.
(a) Multifamily buildings shall meet all of the following:
- The applicable requirements of Sections 110.0 through 110.10.
- The applicable requirements of Section 160.0 (mandatory features).
- Either the performance standards Section 170.1 or the prescriptive standards Section 170.2 set forth in this subchapter for the climate zone in which the building is located. Climate zones are shown in Reference Joint Appendix JA2— Weather/Climate Data.
Exception to Section 170.0 (a)3: If a single development falls in more than one climate zone, all buildings in the subdivision or tract may be designed to meet the performance or prescriptive standards for the climate zone that contains 50 percent or more of the dwelling units.
NOTE: The Commission periodically updates, publishes and makes available to interested persons and local enforcement agencies precise descriptions of the climate zones, as specified in Reference Joint Appendix JA2—Weather/Climate Data.
NOTE: The requirements of Sections 170.1(a) through 170.2(e) apply to newly constructed buildings and Sections 180.1 and 180.2 specify changes to the requirements of Sections 170.1(a) through 170.2(e) that apply to additions or alterations.
NOTE: Authority: Sections 25213, 25218, 25218.5, 25402 and 25402.1, Public Resources Code . Reference: Sections 25007, 25008, 25218.5, 25310, 25402, 25402.1, 25402.4, 25402.5, 25402.8 and 25943, Public Resources Code .
SECTION 170.1—PERFORMANCE APPROACH
A building complies with the performance approach if the energy consumption calculated for the proposed design building is no greater than the energy budget calculated for the standard design building using Commission-certified compliance software as specified by Sections 10-109 and 10-116 and the Alternative Calculation Method Reference Manual.
§ 10-109 Medium relevance — show source text
(b) Performance approach. A building complies with the performance approach if the energy consumption calculated for the proposed design building is no greater than the energy budget calculated for the standard design building using Commission-certified compliance software as specified by Sections 10-109(c) and 10-116.
- Energy budget. The energy budget is expressed in terms of source energy and long-term system cost (LSC). A. Long-term system cost (LSC). The LSC energy budget is determined by applying the mandatory and prescriptive requirements of the standard design to the proposed design building and has two components, the Efficiency LSC and the Total LSC.
i. The Efficiency LSC energy is the sum of the LSC energy for space-conditioning, water heating, mechanical ventilation, and the self-utilization credit.
ii. The Total LSC energy is the sum of the Efficiency LSC energy and LSC energy from the photovoltaic system, battery energy storage systems (BESS), lighting, demand flexibility, and other plug loads. B. Source energy. The source energy budget is determined by applying the mandatory and prescriptive requirements of the standard design to the proposed design building. The source energy is the total annual source energy. Exception to Section 150.1(b)1. A community shared solar electric generation system, or other renewable electric generation system, or community shared BESS, which provides dedicated power, utility energy reduction credits, or payments for energy bill reductions to the permitted building and is approved by the Energy Commission as specified in Title 24, Part 1, Section 10-115, may offset part or all of the solar electric generation system and demand flexibility Energy Design Rating required to comply with the Standards, as calculated according to methods established by the Commission in the Residential ACM Reference Manual.
- Compliance demonstration requirements for performance standards. A. Certificate of compliance and application for a building permit. The application for a building permit shall include documentation pursuant to Sections 10-103(a)1 and 10-103(a)2 which demonstrates, using an approved calculation method, that the building has been designed so that its energy consumption does not exceed the standard design energy budgets for the applicable climate zone. Exception to Section 150.1(b)2A Multiple orientation: A permit applicant may demonstrate compliance with the energy budget requirements of Section 150.1(a) and (b) for any orientation of the same building model if the documentation demonstrates that the building model with its proposed designs and features would comply in each of the four cardinal orientations.
B. Field verification. When performance of installed features, materials, components, manufactured devices or systems above the minimum specified in Section 150.1(c) is necessary for the building to comply with Section 150.1(b), or is necessary to achieve a more stringent local ordinance, field verification shall be performed in accordance with the applicable requirements in the following subsections, and the results of the verification(s) shall be documented on applicable certificates of installation pursuant to Section 10-103(a)3 and applicable certificates of verification pursuant to Section 10-103(a)5. i. EER2/SEER2/CEER/HSPF2 Rating. When performance compliance requires installation of a space-conditioning system with a rating that is greater than the minimum rating required by Table 150.1-A or specified for the standard design, the installed system shall be field verified in accordance with the procedures specified in the applicable sections of Reference Residential Appendix RA3.4. ii. **Variable capacity heat pump (VCHP) compliance option.
§ 140.0 Medium relevance — show source text
Note to Section 140.0(c): The Commission periodically updates, publishes and makes available to interested persons and local enforcement agencies precise descriptions of the climate zones, which is available by zip code boundaries depicted in the Reference Joint Appendices along with a list of the communities in each zone.
Note to Section 140.0: The requirements of Sections 140.1 through 140.10 apply to newly constructed buildings. Section 141.0 specifies which requirements of Sections 140.1 through 140.10 also apply to additions or alterations to existing buildings.
Note: Authority: Sections 25213, 25218, 25218.5, 25402 and 25402.1, Public Resources Code. Reference: Sections 25007, 25008, 25218.5, 25310, 25402, 25402.1, 25402.4, 25402.5, 25402.8, and 25943, Public Resources Code.
SECTION 140.1—PERFORMANCE APPROACH: ENERGY BUDGETS
A building complies with the performance standards if the energy consumption calculated for the proposed design building is no greater than the energy budget calculated for the standard design building using Commission-certified compliance software as specified by Sections 10-109(c) and 10-116.
(a) Energy budget. The energy budget is expressed in terms of long-term system cost (LSC) and source energy.
- Long-term system cost (LSC). The LSC energy budget is determined by applying the mandatory and prescriptive requirements of the standard design to the proposed design building and has two components, the Efficiency LSC and the Total LSC.
A. The Efficiency LSC energy is the sum of the LSC energy for space-conditioning, water heating, mechanical ventilation, and lighting. B. The Total LSC energy is the sum of the Efficiency LSC energy and LSC energy from the photovoltaic system, battery energy storage systems (BESS) and demand flexibility. 2. Source energy . The source energy budget is determined by applying the mandatory and prescriptive requirements of the standard design to the proposed design building.
Exception to Section 140.1(a). A community shared solar electric generation system, or other renewable electric generation system, and/or community shared BESS, that provides dedicated power, utility energy reduction credits or payments for energy bill reductions to the permitted building and is approved by the Energy Commission as specified in Title 24, Part 1, Section 10-115, may offset part or all of the solar electric generation system or BESS LSC energy required to comply with the standards, as calculated according to methods established by the Commission in the Nonresidential ACM Reference Manual.
Note: Authority: Sections 25213, 25218, 25218.5, 25402 and 25402.1, Public Resources Code. Reference: Sections 25007, 25008, 25218.5, 25310, 25402, 25402.1, 25402.4, 25402.5, 25402.8, and 25943, Public Resources Code.
SECTION 140.2—PRESCRIPTIVE APPROACH
To comply using the prescriptive approach a building shall be designed with and shall have constructed and installed systems and components meeting the applicable requirements of Sections 140.3 through 140.10.
§ 10-109 Medium relevance — show source text
SOUTH-FACING (See “orientation.”)
SPA is a vessel that contains heated water in which humans can immerse themselves, is not a pool, and is not a bathtub.
SPACE-CONDITIONING SYSTEM is a system that provides mechanical heating or mechanical cooling within or associated with conditioned spaces in a building, and may incorporate use of components such as chillers/compressors, fluid distribution systems (e.g., air ducts, water piping, refrigerant piping), pumps, air handlers, cooling and heating coils, air or water cooled condensers, economizers, terminal units, and associated controls.
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STANDARD DESIGN BUILDING is a building that is automatically simulated by Commission-approved compliance software to establish the energy budget that is the maximum energy consumption allowed by a proposed design building to comply with the Title 24 Building Energy Efficiency Standards. The standard design building is simulated using the same location and having the same characteristics of the proposed design building, but assuming minimal compliance with the mandatory and prescriptive requirements that are applicable to the proposed building, as specified by Section 10-109(c) and Section 10-116.
STORAGE, COLD is a storage area within a refrigerated warehouse where space temperatures are maintained at or above 32°F.
STORAGE, FROZEN is a storage area within a refrigerated warehouse where the space temperatures are maintained below 32°F.
TENANT SPACE is a portion of a building occupied by a tenant.
THERMAL MASS is solid or liquid material with a high overall heat capacity to store energy for heating or cooling requirements.
THERMAL RESISTANCE (R) is a measurement of the resistance over time of a material or building component to the passage of heat in (hr × ft [2] × °F)/Btu.
THERMOSTAT is an automatic control device or system used to maintain temperature at a fixed or adjustable setpoint.
THERMOSTATIC EXPANSION VALVE (TXV) is a refrigerant metering valve, installed in an air conditioner or heat pump, which controls the flow of liquid refrigerant entering the evaporator in response to the superheat of the gas leaving it.
TOTAL HEAT OF REJECTION (THR) is the heat rejected by refrigeration system compressors at design conditions, consisting of the design cooling capacity plus the heat of compression added by the compressors.
TOWNHOUSE is a single-family dwelling unit constructed in a group of three or more attached units in which each unit extends from the foundation to roof and with open space on at least two sides.
TRANSCRITICAL CO 2 REFRIGERATION SYSTEM is a type of refrigeration system that uses CO 2 as the refrigerant where the ultimate heat rejection to ambient air can take place above the critical point.
SUBCRITICAL MODE is a system operating condition for a refrigeration system wherein the refrigerant pressure and temperature leaving the compressor is such that the refrigerant is below the critical point. Typically used in reference to CO 2 refrigeration systems.
TRANSCRITICAL MODE is a system operating condition for a refrigeration system wherein the refrigerant pressure and temperature leaving the compressor is such that the refrigerant is at or above the critical point. Typically used in reference to CO 2 refrigeration systems.
TRANSIENT is the occupancy for not more than 30 days of a dwelling unit or sleeping unit.
§ 110.11 Medium relevance — show source text
(a) Low-voltage dry-type distribution transformer shall be certified by the Manufacturer as required by the Title 20 Appliance Efficiency Regulations.
EXCEPTION to Section 110.11(a):
autotransformer;
drive (isolation) transformer;
grounding transformer;
machine-tool (control) transformer;
nonventilated transformer;
rectifier transformer;
regulating transformer;
sealed transformer;
special-impedance transformer;
testing transformer;
transformer with tap range of 20 percent or more;
uninterruptible power supply transformer; or
welding transformer.
Note: Authority: Sections 25213, 25218, 25218.5, 25402 and 25402.1, Public Resources Code. Reference: Sections 25007, 25008, 25218.5, 25310, 25402, 25402.1, 25402.4, 25402.8, and 25943, Public Resources Code.
SECTION 110.12 — MANDATORY REQUIREMENTS FOR DEMAND MANAGEMENT
Buildings, other than healthcare facilities, that install or are required to install demand responsive controls shall comply with the applicable demand responsive control requirements of Sections 110.12(a) through 110.12(e). (a) Demand responsive controls.
- All demand responsive controls shall be either: A. A certified OpenADR 2.0a or OpenADR 2.0b Virtual End Node (VEN), as specified under Clause 11, Conformance, in the applicable OpenADR 2.0 Specification; or a certified Baseline Profile OpenADR 3.0 Virtual End Node; or
B. Certified to the Energy Commission as being capable of responding to a demand response signal from a certified OpenADR 2.0b or a certified Baseline Profile OpenADR 3.0 Virtual End Node by automatically implementing the control functions requested by the Virtual End Node for the equipment it controls. 2. All demand responsive controls shall be capable of communicating with the VEN using a wired or wireless bidirectional communication protocol.
Reserved.
When the demand response signal is disabled or unavailable, all demand responsive controls shall continue to perform all other control functions provided by the control.
Demand responsive control thermostats shall comply with Reference Joint Appendix 5 (JA5), Technical Specifications for Occupant Controlled Smart Thermostats. (b) Demand Responsive Zonal HVAC Controls. Nonresidential HVAC systems with DDC to the Zone level shall be programmed to allow centralized demand shed for noncritical zones as follows:
The controls shall have a capability to remotely increase the operating cooling temperature set points by 4 degrees or more in all noncritical zones on signal from a centralized contact or software point within an Energy Management Control System (EMCS).
The controls shall have a capability to remotely decrease the operating heating temperature set points by 4 degrees or more in all noncritical zones on signal from a centralized contact or software point within an EMCS.
The controls shall have capabilities to remotely reset the temperatures in all noncritical zones to original operating levels on signal from a centralized contact or software point within an EMCS.
The controls shall be programmed to provide an adjustable rate of change for the temperature increase, decrease, and reset.
§ 10-109 High relevance — show source text
COMPLIANCE SOFTWARE is software that has been approved pursuant to Section 10-109 of Part 1 of Title 24 of the California Code of Regulations, to demonstrate compliance with the performance approach of Part 6.
COMPRESSED AIR SYSTEM is a system of at least one compressor providing compressed air at 40 psig or higher.
COMPUTER ROOM is a room within a building whose primary function is to house electronic equipment and that has a design information technology equipment (ITE) equipment power density exceeding 20 watts/ft [2] (215 watts/m [2] ) of conditioned floor area.
CONDENSER is a refrigeration component that condenses refrigerant vapor by rejecting heat to air mechanically circulated over its heat transfer surface.
CONDENSER, ADIABATIC is a condenser that has the ability to use two heat transfer processes in series as accomplished by a single factory-made unit. The first heat transfer process is the precooling of the entering air by lowering the entering air drybulb temperature. The second heat transfer process is forced-air circulation cooling over the heat transfer surface of the condenser.
DRY MODE is an operating condition of an adiabatic condenser wherein the only means of heat transfer is accomplished through forced-air circulation over the heat transfer surface of the condenser without any precooling of the entering air.
PRECOOL MODE is an operating condition of an adiabatic condenser wherein the entering air is precooled.
CONDENSER SPECIFIC EFFICIENCY is the full load condenser Total Heat of Rejection (THR) capacity at standardized conditions divided by the fan input electric power (including but not limited to spray pump electric input power for evaporative condensers) at 100 percent rated fan speed.
CONDITIONED FLOOR AREA (CFA) is the floor area (in square feet) of enclosed conditioned space on all floors of a building, as measured at the floor level of the exterior surfaces of exterior walls enclosing the conditioned space.
CONDITIONED GREENHOUSE is a greenhouse that is provided with wood heating, mechanical heating that has a capacity exceeding 10 Btu/hr-ft2, or mechanical cooling that has a capacity exceeding 5 Btu/hr-ft2.
CONDITIONED SPACE is an enclosed space within a building that is directly conditioned or indirectly conditioned.
CONDITIONED SPACE, DIRECTLY is an enclosed space that is provided with wood heating, mechanical heating that has a capacity exceeding 10 Btu/hr-ft [2] ) or mechanical cooling that has a capacity exceeding 5 Btu/hr-ft [2] . Directly conditioned space does not include process space. (See “process space.”)
CONDITIONED SPACE, INDIRECTLY is enclosed space that (1) is not directly conditioned space; and (2) either (a) has a thermal transmittance area product (UA) to directly conditioned space exceeding that to the outdoors or to unconditioned space and does not have fixed vents or openings to the outdoors or to unconditioned space, or (b) is a space through which air from directly conditioned spaces is transferred at a rate exceeding three air changes per hour.
CONDITIONED VOLUME is the total volume (in cubic feet) of the conditioned space within a building.
CONTINUOUS INSULATION (c.i.) is insulation that is continuous across all assemblies that separate conditioned from unconditioned space. It is installed on the exterior or interior or is integral to any opaque surface of the building envelope and has no thermal bridges other than fasteners and necessary service openings.
§ 110.2 Medium relevance — show source text
COMBINED ENERGY EFFICIENCY RATIO (CEER) is the ratio of net cooling capacity (in Btu/hr) to total rate of electrical energy input (in watts) of a cooling system under designated operating conditions, including standby mode, as determined using the applicable test method in the Appliance Efficiency Regulations.
COMBUSTION AIR POSITIVE SHUT-OFF is a means of restricting air flow through a boiler combustion chamber during standby periods, used to reduce standby heat loss. A flue damper and a vent damper are two examples of combustion air positive shut-off devices.
COMBUSTION EFFICIENCY is a measure of the percentage of heat from the combustion of gas or oil that is transferred to the medium being heated or lost as jacket loss.
COMMERCIAL BOILER is a type of boiler with a capacity (rated maximum input) of 300,000 Btus per hour (Btu/h) or more and serving a space heating or water heating load in a commercial building.
COMMISSION is the California State Energy Resources Conservation and Development Commission, which is also referred to as the California Energy Commission.
COMPARTMENTALIZATION is when a dwelling unit enclosure area, including walls, ceilings, and floors shared with exterior spaces or adjacent spaces in the building, including but not limited to neighboring units, corridors, and elevator shafts, is constructed to prevent air leakage.
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COMPLEX MECHANICAL SYSTEMS are systems that include 1) fan systems each serving multiple thermostatically controlled zones; or 2) built-up air handler systems (nonunitary or nonpackaged HVAC equipment); or 3) hydronic or steam heating systems; or 4) hydronic cooling systems. Complex mechanical systems are NOT the following: (1) unitary or packaged equipment listed in Table 110.2-A, 110.2-B, 110.2-C or 110.2-E that each serves one zone, or (2) two-pipe, heating only systems serving one or more zones.
COMPLIANCE SOFTWARE is software that has been approved pursuant to Section 10-109 of Part 1 of Title 24 of the California Code of Regulations, to demonstrate compliance with the performance approach of Part 6.
COMPRESSED AIR SYSTEM is a system of at least one compressor providing compressed air at 40 psig or higher.
COMPUTER ROOM is a room within a building whose primary function is to house electronic equipment and that has a design information technology equipment (ITE) equipment power density exceeding 20 watts/ft [2] (215 watts/m [2] ) of conditioned floor area.
CONDENSER is a refrigeration component that condenses refrigerant vapor by rejecting heat to air mechanically circulated over its heat transfer surface.
CONDENSER, ADIABATIC is a condenser that has the ability to use two heat transfer processes in series as accomplished by a single factory-made unit. The first heat transfer process is the precooling of the entering air by lowering the entering air drybulb temperature. The second heat transfer process is forced-air circulation cooling over the heat transfer surface of the condenser.
DRY MODE is an operating condition of an adiabatic condenser wherein the only means of heat transfer is accomplished through forced-air circulation over the heat transfer surface of the condenser without any precooling of the entering air.
§ 10-109 Medium relevance — show source text
PROPOSED DESIGN BUILDING is a building that is simulated by Commission-approved compliance software to determine the energy consumption resulting from all of the characteristics and energy consuming features that are actually proposed for a building, as specified by Section 10-109(c) and Section 10-116.
PUBLIC AREAS are spaces generally open to the public at large, customers or congregation members, or similar spaces where occupants need to be prevented from controlling lights for safety, security or business reasons. R -VALUE is the measure of the thermal resistance of insulation or any material or building component expressed in ft [2] -hr-°F/Btu.
RADIANT BARRIER is a highly reflective, low emitting material installed at the underside surface of the roof deck and the inside surface of gable ends or other exterior vertical surfaces in attics to reduce solar heat gain.
RAISED FLOOR is a floor (partition) over a crawl space, or an unconditioned space, or ambient air.
READILY ACCESSIBLE is capable of being reached quickly for operation, repair or inspection, without requiring climbing or removing obstacles, or resorting to access equipment.
RECOOL is the cooling of air that has been previously heated by space-conditioning equipment or systems serving the same building.
RECOVERED ENERGY is energy used in a building that (1) is recovered from space conditioning, service water heating, lighting, or process equipment after the energy has performed its original function; (2) provides space conditioning, service water heating, or lighting; and (3) would otherwise be wasted.
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RECOVERED ENERGY, ON-SITE is recovered energy that is captured at the building site.
REFERENCE APPENDICES is the support document for the Building Energy Efficiency Standards. The document consists of three sections: the Reference Joint Appendices (JA), the Reference Residential Appendices (RA) and the Reference Nonresidential Appendices (NA).
REFLECTANCE, SOLAR is the ratio of the reflected solar flux to the incident solar flux.
REFRIGERATED CASE is a manufactured commercial refrigerator or freezer, including but not limited to display cases, reach-in cabinets, meat cases, and frozen food and soda fountain units.
REFRIGERATED SPACE is a space constructed for storage or handling of products, where mechanical refrigeration is used to maintain the space temperature at 55°F or less.
REFRIGERATED WAREHOUSE is a building or a space greater than or equal to 3,000 square feet constructed for storage or handling of products, where mechanical refrigeration is used to maintain the space temperature at 55°F or less.
REHEAT is the heating of air that has been previously cooled by cooling equipment or supplied by an economizer.
RELOCATABLE PUBLIC SCHOOL BUILDING is a relocatable building as defined by Title 24, Part 1, Section 4-314, which is subject to Title 24, Part 1, Chapter 4, Group 1.
REPAIR is the reconstruction or renewal for the purpose of maintenance of any component, system or equipment of an existing building. Repairs shall not increase the preexisting energy consumption of the repaired component, system or equipment. Replacement of any component, system or equipment for which there are requirements in the Standards is considered an alteration and not a repair.
§ 130.5 Medium relevance — show source text
Exception 2 to Section 130.5(d): Receptacles in healthcare facilities.
(e) Demand responsive controls and equipment. See Section 110.12 for requirements for demand responsive controls and equipment, including demand responsive controls for controlled receptacles.
Note: Definitions of terms and phrases in Section 130.5 are determined as specified in Section 100.1(b). Terms and phrases not found in Section 100.1(b) shall be defined as specified in Title 24, Part 3, Article 100 of the California Electrical Code.
Note: Authority: Sections 25213, 25218, 25218.5, 25402 and 25402.1, Public Resources Code. Reference: Sections 25007, 25008, 25218.5, 25310, 25402, 25402.1, 25402.4, 25402.5, 25402.8, and 25943, Public Resources Code.
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5 NONRESIDENTIAL AND HOTEL/MOTEL OCCUPANCIES—
PERFORMANCE AND PRESCRIPTIVE COMPLIANCE APPROACHES FOR ACHIEVING ENERGY EFFICIENCY
SECTION 140.0—PERFORMANCE AND PRESCRIPTIVE COMPLIANCE APPROACHES
Nonresidential and hotel/motel buildings shall comply with all of the following: (a) The requirements of Sections 100.0 through 110.12 applicable to the building project (mandatory measures for all buildings). (b) The requirements of Sections 120.0 through 130.5 (mandatory measures for nonresidential and hotel/motel buildings). (c) Either the performance compliance approach (energy budgets) specified in Section 140.1 or the prescriptive compliance approach specified in Section 140.2 for the climate zone in which the building will be located. Climate zones are shown in Figure 100.1-A.
Note to Section 140.0(c): The Commission periodically updates, publishes and makes available to interested persons and local enforcement agencies precise descriptions of the climate zones, which is available by zip code boundaries depicted in the Reference Joint Appendices along with a list of the communities in each zone.
Note to Section 140.0: The requirements of Sections 140.1 through 140.10 apply to newly constructed buildings. Section 141.0 specifies which requirements of Sections 140.1 through 140.10 also apply to additions or alterations to existing buildings.
Note: Authority: Sections 25213, 25218, 25218.5, 25402 and 25402.1, Public Resources Code. Reference: Sections 25007, 25008, 25218.5, 25310, 25402, 25402.1, 25402.4, 25402.5, 25402.8, and 25943, Public Resources Code.
SECTION 140.1—PERFORMANCE APPROACH: ENERGY BUDGETS
A building complies with the performance standards if the energy consumption calculated for the proposed design building is no greater than the energy budget calculated for the standard design building using Commission-certified compliance software as specified by Sections 10-109(c) and 10-116.
§ 150.1 Medium relevance — show source text
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8 SINGLE-FAMILY RESIDENTIAL BUILDINGS—PERFORMANCE
AND PRESCRIPTIVE COMPLIANCE APPROACHES
SECTION 150.1—PERFORMANCE AND PRESCRIPTIVE COMPLIANCE APPROACHES FOR SINGLE-FAMILY RESIDENTIAL BUILDINGS
(a) Basic requirements. Single-family residential buildings shall meet all of the following:
- The applicable requirements of Sections 110.0 through 110.10.
- The applicable requirements of Section 150.0 (mandatory features).
- Either the performance standards or the prescriptive standards set forth in this section for the climate zone in which the building is located. Climate zones are shown in Reference Joint Appendix JA2–Weather/Climate Data. Exception to Section 150.1(a)3: If a single contiguous subdivision or tract falls in more than one climate zone, all buildings in the subdivision or tract may be designed to meet the performance or prescriptive standards for the climate zone that contains 50 percent or more of the dwelling units. Note: The Commission periodically updates, publishes, and makes available to interested persons and local enforcement agencies precise descriptions of the climate zones, as specified in Reference Joint Appendix JA2–Weather/Climate Data.
Note: The requirements of Sections 150.0(a) through 150.0(r) apply to newly constructed buildings and Sections 150.2(a) and 150.2(b) specifies changes to the requirements of Sections 150.1(a) through 150.1(c) that apply to additions or alterations.
(b) Performance approach. A building complies with the performance approach if the energy consumption calculated for the proposed design building is no greater than the energy budget calculated for the standard design building using Commission-certified compliance software as specified by Sections 10-109(c) and 10-116.
- Energy budget. The energy budget is expressed in terms of source energy and long-term system cost (LSC). A. Long-term system cost (LSC). The LSC energy budget is determined by applying the mandatory and prescriptive requirements of the standard design to the proposed design building and has two components, the Efficiency LSC and the Total LSC.
i. The Efficiency LSC energy is the sum of the LSC energy for space-conditioning, water heating, mechanical ventilation, and the self-utilization credit.
ii. The Total LSC energy is the sum of the Efficiency LSC energy and LSC energy from the photovoltaic system, battery energy storage systems (BESS), lighting, demand flexibility, and other plug loads. B. Source energy. The source energy budget is determined by applying the mandatory and prescriptive requirements of the standard design to the proposed design building. The source energy is the total annual source energy. Exception to Section 150.1(b)1. A community shared solar electric generation system, or other renewable electric generation system, or community shared BESS, which provides dedicated power, utility energy reduction credits, or payments for energy bill reductions to the permitted building and is approved by the Energy Commission as specified in Title 24, Part 1, Section 10-115, may offset part or all of the solar electric generation system and demand flexibility Energy Design Rating required to comply with the Standards, as calculated according to methods established by the Commission in the Residential ACM Reference Manual.
§ 006-2006 Medium relevance — show source text
SMACNA is the Sheet Metal and Air-conditioning Contractors National Association.
SMACNA HVAC DUCT CONSTRUCTION STANDARDS is the Sheet Metal Contractors’ National Association document “HVAC Duct Construction Standards Metal and Flexible - 3rd Edition,” 2006 (2006 ANSI/SMACNA- 006-2006 HVAC Duct Construction Standards Metal and Flexible 3rd Edition).
SMACNA RESIDENTIAL COMFORT SYSTEM INSTALLATION STANDARDS is the Sheet Metal Contractors’ National Association document entitled “Residential Comfort System Installation Standards, Eighth Edition,” (2016).
SOCIAL SERVICES BUILDING is a space where public assistance and social services are provided to individuals or families.
SOLAR ELECTRIC GENERATION SYSTEM or PHOTOVOLTAIC SYSTEM is the complete set of all components for converting sunlight into electricity through the photovoltaic process, including the array of panels, inverter(s) and the balance of system components required to enable the system to effectively deliver power to reduce a building’s consumption of electricity from the utility grid.
SOLAR POOL HEATING SYSTEM is an assembly of components designed to heat water for swimming pools, spas or swimming pool and spa combinations by solar thermal means, excluding pool recirculation components.
SOLAR REFLECTANCE INDEX (SRI) is a measure of the roof’s ability to reject solar heat, which includes both reflectance and emittance.
SOLAR SAVINGS FRACTION (SSF) is the fraction of domestic hot water demand provided by a solar water-heating system.
SOLAR ZONE is a section of the roof designated and reserved for the future installation of a solar electric or solar thermal system.
SOURCE ENERGY is defined as the long run hourly marginal source energy of fossil fuels that are combusted as a result of building energy consumption either directly at the building site or caused to be consumed to meet the electrical demand of the building considering the long-term effects of Commission-projected energy resource procurement. For a given hour, the value in that hour for each forecasted year is averaged to establish a lifetime average source energy.
SOUTH-FACING (See “orientation.”)
SPA is a vessel that contains heated water in which humans can immerse themselves, is not a pool, and is not a bathtub.
SPACE-CONDITIONING SYSTEM is a system that provides mechanical heating or mechanical cooling within or associated with conditioned spaces in a building, and may incorporate use of components such as chillers/compressors, fluid distribution systems (e.g., air ducts, water piping, refrigerant piping), pumps, air handlers, cooling and heating coils, air or water cooled condensers, economizers, terminal units, and associated controls.
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STANDARD DESIGN BUILDING is a building that is automatically simulated by Commission-approved compliance software to establish the energy budget that is the maximum energy consumption allowed by a proposed design building to comply with the Title 24 Building Energy Efficiency Standards. The standard design building is simulated using the same location and having the same characteristics of the proposed design building, but assuming minimal compliance with the mandatory and prescriptive requirements that are applicable to the proposed building, as specified by Section 10-109(c) and Section 10-116.
STORAGE, COLD is a storage area within a refrigerated warehouse where space temperatures are maintained at or above 32°F.
§ 62.1. Medium relevance — show source text
Of Class 4 as defined in ASHRAE Standard 62.1.
Systems expected to operate less than 20 hours per week.
A5.203.1.2 Performance standard. Comply with one of the advanced efficiency levels indicated below.
A5.203.1.2.1 Tier 1. Buildings complying with the first level of advanced energy efficiency shall have an Energy Budget that is no greater than indicated below, depending on building type and the type of energy systems included in the building project. If the newly constructed building or addition does not include indoor lighting or mechanical systems, then no additional performance requirements above Title 24, Part 6 are required.
- For nonresidential building projects that include indoor lighting or mechanical systems, but not both: No greater than 95 percent of the Title 24, Part 6, Energy Budget for the Standard Design Building as calculated by compliance software certified by the Energy Commission.
- For nonresidential building projects that include indoor lighting and mechanical systems: No greater than 90 percent of the Title 24, Part 6 Energy Budget for the Standard Design Building as calculated by compliance software certified by the Energy Commission.
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APPENDIX A5 — NONRESIDENTIAL VOLUNTARY MEASURES
- For high-rise residential and hotel/motel building projects: No greater than 95 percent of the Title 24, Part 6, Energy Budget for the Standard Design Building as calculated by compliance software certified by the Energy Commission.
A5.203.1.2.2 Tier 2. Buildings complying with the second level of advanced energy efficiency shall have an Energy Budget that is no greater than indicated below, depending on building type and the type of energy systems included in the building project. If the newly constructed building or addition does not include indoor lighting or mechanical systems, then no additional performance requirements above Title 24, Part 6 are required.
- For nonresidential building projects that include indoor lighting or mechanical systems, but not both: No greater than 90 percent of the Title 24, Part 6, Energy Budget for the Standard Design Building as calculated by compliance software certified by the Energy Commission.
- For nonresidential building projects that include indoor lighting and mechanical systems: No greater than 85 percent of the Title 24, Part 6, Energy Budget for the Standard Design Building as calculated by compliance software certified by the Energy Commission.
- For high-rise residential and hotel/motel building projects: No greater than 95 percent of the Title 24, Part 6, Energy Budget for the Standard Design Building as calculated by compliance software certified by the Energy Commission.
Note: For Energy Budget calculations, high-rise residential and hotel/motel buildings are considered nonresidential buildings.
SECTION A5.204—MANDATORY REQUIREMENTS FOR ALTERATIONS TO EXISTING BUILDINGS
A5.204.1 Energy efficiency . Alterations to existing nonresidential buildings shall comply with Section A5.204.1.1.
A5.204.1.1 Altered pool and/or spa heating for existing nonresidential buildings . Alteration of existing nonresidential pool and/or spa heating system shall meet the following.
Heating source sizing. Heating systems or equipment for pools or spas shall meet one of the sizing requirements of Items 1 through 5 below: 1.
Frequently asked questions
What exactly is “compliance software” under Title 24?
“COMPLIANCE SOFTWARE” is the term the code uses for the computer programs the Energy Commission approves to demonstrate compliance with Part 6 (performance approach). The code ties that approval to § 10-109 and use in modeling rules set out in § 10-116.
Can I use an in‑house energy model or spreadsheet for the performance path?
No — the performance path requires Commission‑approved/certified compliance software under § 10-109 and § 10-116. Results from unapproved tools will not satisfy the Part 6 performance documentation requirements.
Where are the software certification rules documented?
The code references the certification/approval requirement in § 10-109 and the applicable modeling rules in § 10-116; procedural details, test procedures, and the Commission’s list of certified software are maintained by the California Energy Commission outside the Part 6 text.
For an alteration, can the software use “existing efficiency levels”?
Yes — for alterations the standard design altered‑component rules require use of the “existing efficiency level” modeling rules described in § 10-109(c) and § 10-116; your compliance software must implement those rules.
Do certified tools also handle LSC and Source Energy?
Yes — performance compliance uses LSC and/or Source Energy budgets; compliance software must implement those calculations and produce the required outputs for the Certificate of Compliance. The LSC calculation approach is defined in the code and implemented by certified software.
More in California Energy Code
- Compliance paths, energy budgets, performance modeling and forms/software requirements
- Controls, commissioning, demand-response, sensors, and field verification/diagnostic testing
- Domestic hot water systems, efficiency, controls and installation requirements
- Electrical infrastructure, EV charging readiness, load management and demand controls
- Envelope construction, insulation, fenestration and thermal performance
- HVAC systems, ventilation rates, ducting, controls and testing
- Interior and exterior lighting power, controls and daylighting requirements
- Mandatory measures, appliance efficiency and certification requirements
- Photovoltaic requirements, BESS (battery energy storage) sizing and SARA procedures
- Reference appendices, test procedures, product certification and labeling requirements
- Scope, applicability, definitions and administrative requirements
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