CALGreen · California Green Building Standards Code (CALGreen)

May uncertified workers perform HVAC installations under supervision?

Under CALGreen **§ 702.1**, uncertified workers may perform HVAC installation tasks only while a certified HVAC installer or a contractor licensed to install HVAC systems is **directly supervising and responsible**; acceptable training programs include apprenticeships, utility or trade programs, manufacturer programs, or other programs approved by the enforcing agency.

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Last reviewed: July 6, 2026

What the code requires — 2–4 sentences

The California Green Building Standards Code requires that HVAC system installers be trained and certified by a nationally or regionally recognized program. However, uncertified persons may perform HVAC installations when under the direct supervision and responsibility of a person trained and certified to install HVAC systems or a contractor licensed to install HVAC systems — this is the rule in § 702.1.

If a worker is not certified, they may still do HVAC installation work only while a certified installer or licensed HVAC contractor is directly supervising and taking responsibility for the work.

Requirements in detail

Who must be certified

  • HVAC system installers must be trained and certified by a nationally or regionally recognized training or certification program. § 702.1 is the controlling provision.

When uncertified persons may work

  • Uncertified persons may perform installation tasks only when under the direct supervision and responsibility of:
    • A person who is trained and certified to install HVAC systems, or
    • A contractor licensed to install HVAC systems.

Acceptable training/certification examples

The code lists examples of acceptable programs (non‑exclusive), including:

  • State certified apprenticeship programs
  • Public utility training programs
  • Training programs sponsored by trade or labor organizations
  • Manufacturer‑sponsored programs
  • Other programs acceptable to the enforcing agency
    These are illustrative, and the enforcing agency may accept other programs. § 702.1.

Decision-relevant summary table

Decision dimension Values / requirement Code Reference
Who must be certified HVAC system installers § 702.1
Can uncertified workers install HVAC? Yes, only under direct supervision and responsibility of a certified installer or licensed contractor § 702.1
Who may supervise uncertified workers Certified installer or contractor licensed to install HVAC systems § 702.1
Acceptable cert/training programs State apprenticeship, utility programs, trade/labor programs, manufacturer programs, or other programs acceptable to the enforcing agency § 702.1
Documentation of compliance Construction documents, installer certification, inspection reports, or other methods acceptable to the enforcing agency § 703.1

Exceptions & special cases

  • The code itself does not define numeric limits (crew size or helper ratios) for how many uncertified persons one certified supervisor may oversee; those operational details are left to the enforcing agency or other authorities. The text of § 702.1 provides no maximum crew ratio.
  • The list of acceptable training and certification programs in § 702.1 is not exhaustive; the phrase “Other programs acceptable to the enforcing agency” gives the local enforcing agency discretion to accept alternative programs.
  • If the enforcing agency requires special inspection or specific verification methods, that requirement is handled elsewhere in Chapter 7 (see § 702.2 and § 703.1 for special inspection and documentation provisions).

If you need a definitive local interpretation of “direct supervision,” or whether a particular program qualifies, consult the enforcing agency — CALGreen delegates those determinations to them. The code text for § 702.1 does not itself define “direct supervision” or list supervisory duties in greater detail.

Common mistakes

  • Assuming uncertified workers can work unsupervised — CALGreen allows uncertified workers to work only under direct supervision and responsibility of a certified installer or licensed contractor. § 702.1.
  • Treating the examples of training programs as the only acceptable programs — the list is illustrative; the enforcing agency may accept other programs. § 702.1.
  • Failing to document who the certified supervisor is — documentation is required to demonstrate compliance per § 703.1 (construction documents, installer certification, inspection reports, etc.).
  • Confusing certification under CALGreen with contractor licensing: CALGreen requires certified installers (training/certification) but also recognizes a contractor licensed to install HVAC systems as an acceptable supervising entity. Licensing requirements are governed by other law and the AHJ. § 702.1.

Worked example — concrete scenario

Scenario: A contractor is replacing ductwork and a new rooftop package unit on a small commercial storefront.

  1. The contractor holds the appropriate California contractor license to install HVAC systems. The lead technician on site holds a nationally recognized HVAC installation certificate (e.g., a state apprenticeship certificate). Under § 702.1, the contractor or the certified lead may supervise uncertified crew members.
  2. Two uncertified helpers perform duct layout, sheet‑metal cuts, and assist lifting equipment while the certified lead performs the final connections, refrigerant charging, system start‑up, and takes responsibility for system compliance. Because the certified lead or licensed contractor is on site and directly supervising and responsible, CALGreen allows the uncertified helpers to perform the stated work. § 702.1.
  3. The project files include the certified installer’s credentials and installation verification (plans, inspection reports) so the enforcing agency can confirm compliance per § 703.1. If the local enforcing agency requires any special inspection, that requirement would be addressed under § 702.2 or the enforcing agency’s rules.

Note: The code text does not specify a maximum number of uncertified helpers a single supervisor may oversee; consult the local enforcing agency for any practical limits or supervisory requirements.

Related provisions

  • § 702.2 — Special inspection; competence and special inspector qualifications.
  • § 703.1 — Documentation to show compliance (construction documents, installer certification, inspection reports).

Code references

Grounded in the retrieved California Green Building Standards Code (CALGreen) — click a citation to read the verbatim passage:

  • CALGreen § 7-1 High relevance — show source text

    2025 CALIFORNIA GREEN BUILDING STANDARDS CODE 7-1

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    7-2 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    7 INSTALLER AND SPECIAL INSPECTOR QUALIFICATIONS

    SECTION 701—GENERAL (RESERVED)

    SECTION 702—QUALIFICATIONS

    702.1 Installer training. HVAC system installers shall be trained and certified in the proper installation of HVAC systems including ducts and equipment by a nationally or regionally recognized training or certification program. Uncertified persons may perform HVAC installations when under the direct supervision and responsibility of a person trained and certified to install HVAC systems or contractor licensed to install HVAC systems. Examples of acceptable HVAC training and certification programs include but are not limited to the following:

    1. State certified apprenticeship programs.
    2. Public utility training programs.
    3. Training programs sponsored by trade, labor or statewide energy consulting or verification organizations.
    4. Programs sponsored by manufacturing organizations.
    5. Other programs acceptable to the enforcing agency.

    702.2 Special inspection.

    [HCD] When required by the enforcing agency, the owner or the responsible entity acting as the owner’s agent shall employ one or more special inspectors to provide inspection or other duties necessary to substantiate compliance with this code. Special inspectors shall demonstrate competence to the satisfaction of the enforcing agency for the particular type of inspection or task to be performed. In addition to other certifications or qualifications acceptable to the enforcing agency, the following certifications or education may be considered by the enforcing agency when evaluating the qualifications of a special inspector:

    1. Certification by a national or regional green building program or standard publisher.
    2. Certification by a statewide energy consulting or verification organization, building performance contractors and home energy auditors.
    3. Successful completion of a third party apprentice training program in the appropriate trade.
    4. Other programs acceptable to the enforcing agency.

    Note: Special inspectors shall be independent entities with no financial interest in the materials or the project they are inspecting for compliance with this code.

    [BSC-CG] When required by the enforcing agency, the owner or the responsible entity acting as the owner’s agent shall employ one or more special inspectors to provide inspection or other duties necessary to substantiate compliance with this code. Special inspectors shall demonstrate competence to the satisfaction of the enforcing agency for the particular type of inspection or task to be performed. In addition, the special inspector shall have a certification from a recognized state, national or international association, as determined by the local agency. The area of certification shall be closely related to the primary job function, as determined by the local agency.

    Note: Special inspectors shall be independent entities with no financial interest in the materials or the project they are inspecting for compliance with this code.

    SECTION 703—VERIFICATIONS

    703.1 Documentation. Documentation used to show compliance with this code shall include but is not limited to, construction documents, plans, specifications, builder or installer certification, inspection reports or other methods acceptable to the enforcing agency which demonstrate substantial conformance. When specific documentation or special inspection is necessary to verify compliance, that method of compliance will be specified in the appropriate section or identified in the application checklist.

    2025 CALIFORNIA GREEN BUILDING STANDARDS CODE 7-3

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

  • CALGreen § 702.2 High relevance — show source text

    CALIFORNIA GREEN BUILDING STANDARDS CODE – MATRIX ADOPTION TABLE

    CHAPTER 7 – INSTALLER AND SPECIAL INSPECTOR QUALIFICATIONS

    (Matrix Adoption Tables are nonregulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)

    Adopting agency BSC BSC-
    CG    		 SFM HCD Col6 Col7 DSA Col9 OSHPD Col11 Col12 Col13 Col14 Col15 BSCC DPH AGR DWR CEC CA SL SLC
    Adopting agency BSC BSC-
    CG    		 SFM 1 2 1/AC AC SS 1 1R 2 3 4 5 5 5 5 5 5 5 5 5
    Adopt entire CA chapter X
    Adopt entire chapter as
    amended (amended
    sections listed below)
    Adopt only those sections
    that are listed below    		 X
    Chapter/Section
    702.2 X
    703.1 X

    2025 CALIFORNIA GREEN BUILDING STANDARDS CODE 7-1

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    7-2 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    7 INSTALLER AND SPECIAL INSPECTOR QUALIFICATIONS

    SECTION 701—GENERAL (RESERVED)

    SECTION 702—QUALIFICATIONS

    702.1 Installer training. HVAC system installers shall be trained and certified in the proper installation of HVAC systems including ducts and equipment by a nationally or regionally recognized training or certification program. Uncertified persons may perform HVAC installations when under the direct supervision and responsibility of a person trained and certified to install HVAC systems or contractor licensed to install HVAC systems. Examples of acceptable HVAC training and certification programs include but are not limited to the following:

    1. State certified apprenticeship programs.
    2. Public utility training programs.
    3. Training programs sponsored by trade, labor or statewide energy consulting or verification organizations.
    4. Programs sponsored by manufacturing organizations.
    5. Other programs acceptable to the enforcing agency.

    702.2 Special inspection.

    [HCD] When required by the enforcing agency, the owner or the responsible entity acting as the owner’s agent shall employ one or more special inspectors to provide inspection or other duties necessary to substantiate compliance with this code. Special inspectors shall demonstrate competence to the satisfaction of the enforcing agency for the particular type of inspection or task to be performed. In addition to other certifications or qualifications acceptable to the enforcing agency, the following certifications or education may be considered by the enforcing agency when evaluating the qualifications of a special inspector: 1.

  • CALGreen § 506.1 Medium relevance — show source text

    ENERGY STAR fans ducted to terminate outside the building.
    2. Fans must be controlled by a humidity control (separate or built-
    in); OR functioning as a component of a whole-house ventilation
    system.
    3. Humidity controls with manual or automatic means of
    adjustment, capable of adjustment between a relative humidity
    range of≤ 50 percent to a maximum of 80 percent.||||
    |
    |
    | |A4.506.1 Reserved.||||||| |A4.506.2 [HR] Provide filters on return air openings rated MERV 8 or
    higher during construction when it is necessary to use HVAC
    equipment.||||||| |A4.506.3 Direct-vent appliances shall be used when equipment is
    located in conditioned space; or the equipment must be installed in
    an isolated mechanical room.||||||| |Environmental Comfort||||||| |4.507.2 Duct systems are sized, designed and equipment is selected
    using the following methods:
    1. Establish heat loss and heat gain values according to ANSI/ACCA 2
    Manual J-2016 or equivalent.
    2. Size duct systems according to ANSI/ACCA 1 Manual D-2016
    or equivalent.
    3. Select heating and cooling equipment according to ANSI/ACCA 3
    Manual S-2014 or equivalent.||||||| |Outdoor Air Quality
    Reserved||||||| |Innovative Concepts and Local Environmental Conditions|Innovative Concepts and Local Environmental Conditions|Innovative Concepts and Local Environmental Conditions|Innovative Concepts and Local Environmental Conditions|Innovative Concepts and Local Environmental Conditions|Innovative Concepts and Local Environmental Conditions|Innovative Concepts and Local Environmental Conditions| |A4.509.1 Items in this section are necessary to address innovative
    concepts or local environmental conditions.||||||| |Item 1||
    |
    |
    |
    |
    | |Item 2||
    |
    |
    |
    |
    | |Item 3||||||| |Installer and Special Inspector Qualifications||||||| |Qualifications|Qualifications|Qualifications|Qualifications|Qualifications|Qualifications|Qualifications| |702.1 HVAC system installers are trained and certified in the proper
    installation of HVAC systems.||||||| |702.2 Special inspectors employed by the owner or owner's agent
    must be qualified and able to demonstrate competence in the
    discipline they are inspecting to the enforcing agency.

  • CALGreen § 608.0 Medium relevance — show source text

    (3) Heating and cooling equipment in accordance with ACCA Manual S or other equivalent methods.

    E 608.0 Low VOC Solvent Cement and Primer.

    E 608.1 General. Primers and solvent cements used to join plastic pipe, and fittings shall be in accordance with Section E 608.1.1 and Section E 608.1.2.

    E 608.1.1 Solvent Cement. Solvent cement, including one-step solvent cement, shall have a volatile organic compound (VOC) content of less than or equal to 65 ounces per gallon (oz/gal) (487 g/L) for CPVC cement, 68 oz/gal (509 g/L) for PVC cement, and 43 oz/gal (322 g/L) for ABS cement, as determined by the South Coast Air Quality Management District’s Laboratory Methods of Analysis for Enforcement Samples, Method 316A. E 608.1.2 Primer. Primer shall have a volatile organic compound (VOC) content of less than or equal to 73 oz/gal (546 g/L), as determined by the South Coast Air Quality Management District’s Laboratory Methods of Analysis for Enforcement Samples, Method 316A.

    E 701.0 Installer Qualifications.

    E 701.1 Scope. The provisions of this section address minimum qualifications of installers of mechanical systems covered within the scope of this appendix.

    E 702.0 Qualifications.

    E 702.1 General. Where permits are required, the Authority Having Jurisdiction shall have the authority to require contractors, installers, or service technicians to demonstrate competency. Where determined by the Authority Having Jurisdiction, the contractor, installer, or service technician shall be licensed to perform such work.

    Part I

    E 801.0 Heating, Ventilation, and Air Conditioning Systems Commissioning. E 801.1 Applicability. The provisions of this section apply to the commissioning of commercial and institutional HVAC systems.

    E 802.0 Commissioning. E 802.1 Commissioning Requirements. HVAC commissioning shall be included in the design and construction processes of the project to verify that the HVAC systems and components meet the owner’s project requirements and in accordance with this appendix. Commissioning shall be performed in accordance with this appendix by personnel trained and certified in commissioning by a nationally recognized organization. Commissioning requirements shall include the following:

    (1) Owner’s project requirements

    (2) Basis of design

    (3) Commissioning measures shown in the construction doc uments

    (4) Commissioning plan

    (5) Functional performance

    (6) Testing

    (7) Post construction documentation and training

    (8) Commissioning report

    2025 CALIFORNIA MECHANICAL CODE 479

    ), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.

    APPENDIX E

    HVAC systems and components covered by this appendix as well as process equipment and controls, and renewable energy systems shall be included in the scope of the commissioning requirements. E 802.2 Owner’s Project Requirements (OPR). The performance goals and requirements of the HVAC system shall be documented before the design phase of the project begins. This documentation shall include not less than the following:

    (1) Environmental and sustainability goals

    (2) Energy efficiency goals

    (3) Indoor environmental quality requirements

    (4) Equipment and systems performance goals

  • CALGreen § 2.02 Medium relevance — show source text

    05|75°F/52°F (Class 1)|AHRI 1360| |Air cooled with free
    air discharge
    condenser|Ducted|≥29 000 Btu/h and
    <65 000 Btu/h|2.02|2.02|2.02| |Air cooled with free
    air discharge
    condenser|Ducted|≥65 000 Btu/h|1.92|1.92|1.92| |Air cooled with free
    air discharge
    condenser|Nonducted|<29 000 Btu/h|2.08|2.08|2.08| |Air cooled with free
    air discharge
    condenser|Nonducted|≥29 000 Btu/h and
    <65 000 Btu/h|2.05|2.05|2.05| |Air cooled with free
    air discharge
    condenser|Nonducted|≥65 000 Btu/h|1.94|1.94|1.94| |Air cooled with free
    air discharge
    condenser with fluid
    economizer|Ducted|<29 000 Btu/h|2.01|75°F/52°F (Class 1)|AHRI 1360| |Air cooled with free
    air discharge
    condenser with fluid
    economizer|Ducted|≥29 000 Btu/h and
    <65 000 Btu/h|1.97|1.97|1.97| |Air cooled with free
    air discharge
    condenser with fluid
    economizer|Ducted|≥65 000 Btu/h|1.87|1.87|1.87| |Air cooled with free
    air discharge
    condenser with fluid
    economizer|Nonducted|<29 000 Btu/h
    |2.04|2.04|2.04| |Air cooled with free
    air discharge
    condenser with fluid
    economizer|Nonducted|≥29 000 Btu/h and
    <65 000 Btu/h|2.00|2.00|2.00| |Air cooled with free
    air discharge
    condenser with fluid
    economizer|Nonducted|≥65 000 Btu/h
    |1.89
    |1.89
    |1.89
    | |Air cooled with
    ducted condenser|Ducted|<29 000 Btu/h|1.86|75°F/52°F (Class 1)|AHRI 1360| |Air cooled with
    ducted condenser|Ducted|≥29 000 Btu/h and
    <65 000 Btu/h|1.83|1.83|1.83| |Air cooled with
    ducted condenser|Ducted|≥65 000 Btu/h|1.73|1.73|1.73|

    2025 CALIFORNIA MECHANICAL CODE 471

    ), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.

    APPENDIX E

    TABLE E 503.7.1(17) (continued) CEILING-MOUNTED COMPUTER-ROOM AIR CONDITIONERS—MINIMUM EFFICIENCY REQUIREMENTS

    [ASHRAE 90.1: TABLE 6.8.1-17]

  • CALGreen § 0.055 Medium relevance — show source text

    )|0.055 (16 ga.)|0.055 (16 ga.)| |12 to 15|0|0.027 (22 ga.)|0.033 (20 ga.)|0.055 (16 ga.)|0.068 (14 ga.)|0.097 (12 ga.)|0.097 (12 ga.)|––|––|––| |12 to 15|96|0.027 (22 ga.)|0.033 (20 ga.)|0.044 (18 ga.)|0.044 (18 ga.)|0.055 (16 ga.)|0.055 (16 ga.)|0.097 (12 ga.)|0.112 (11 ga.)|0.112 (11 ga.)| |12 to 15|48|0.027 (22 ga.)|0.027 (22 ga.)|0.033 (20 ga.)|0.033 (20 ga.)|0.044 (18 ga.)|0.044 (18 ga.)|0.068 (14 ga.)|0.068 (14 ga.)|0.097 (12 ga.)| |12 to 15|24|0.027 (22 ga.)|0.027 (22 ga.)|0.033 (20 ga.)|0.033 (20 ga.)|0.044 (18 ga.)|0.044 (18 ga.)|0.055 (16 ga.)|0.055 (16 ga.)|0.055 (16 ga.)| |16 to 20|0|0.027 (22 ga.)|0.044 (18 ga.)|0.068 (14 ga.)|0.097 (12 ga.)|0.112 (11 ga.)|––|––|––|––| |16 to 20|96|0.027 (22 ga.)|0.033 (20 ga.)|0.055 (16 ga.)|0.055 (16 ga.)|0.068 (14 ga.)|0.068 (14 ga.)|0.112 (11 ga.)|0.112 (11 ga.)|0.112 (11 ga.)| |16 to 20|48|0.027 (22 ga.)|0.033 (20 ga.)|0.033 (20 ga.)|0.044 (18 ga.)|0.055 (16 ga.)|0.055 (16 ga.)|0.068 (14 ga.)|0.068 (14 ga.)|0.097 (12 ga.)| |16 to 20|24|0.027 (22 ga.)|0.033 (20 ga.)|0.033 (20 ga.)|0.033 (20 ga.)|0.044 (18 ga.)|0.044 (18 ga.)|0.055 (16 ga.)|0.055 (16 ga.)|0.055 (16 ga.)| |||CLASS 3
    (inches)|CLASS 3
    (inches)|CLASS 3
    (inches)|CLASS 3
    (inches)|CLASS 3
    (inches)|CLASS 3
    (inches)|CLASS 3
    (inches)|CLASS 3
    (inches)|CLASS 3
    (inches)| |To 7|0|0.033 (20 ga.)|0.033 (20 ga.)|0.044 (18 ga.)|0.044 (18 ga.)|0.055 (16 ga.)|0.068 (14 ga.

  • CALGreen § 102.2.1 Medium relevance — show source text

    H 102.2.1 Qualification for Mechanical Inspector. Professional qualification for mechanical inspectors shall be in accordance with ASSE/IAPMO/ANSI 16020.

    H 102.2.2 Qualification for Mechanical Plan Exam- iner. Professional qualification for mechanical plan examiners shall be in accordance with ASSE/IAPMO/ANSI

    H 102.3 Residential Mechanical Service Technician. Professional qualification for residential mechanical service technicians shall be in accordance with ASSE/IAPMO/ANSI

    Series 13000.

    H 102.3.1 Qualification for Residential Mechani- cal Service Technician. Professional qualification for residential mechanical service technicians shall be with

    accordance ASSE/IAPMO/ANSI 13020.

    H 102.4 Hydronic Systems. Personnel qualification for installers and designers of hydronic heating and cooling systems, as well as installers of solar water heaters shall be in accordance with ASSE/IAPMO/ANSI Series 19000.

    H 102.4.1 Qualification for Solar Water Heating System Installer. Professional qualification for solar water heating system installers shall be in accordance with ASSE/IAPMO/ANSI 19110.

    H 102.4.2 Qualification for Hydronic Heating and Cooling System Installer. Professional qualification for hydronic heating and cooling system installers shall be in accordance with ASSE/IAPMO/ANSI 19210.

    H 102.4.3 Qualification for Hydronic Heating and Cooling System Designer. Professional qualification for hydronic heating and cooling system designers shall be in accordance with ASSE/IAPMO/ANSI 19220.

    H 102.5 Water Management and Infection Control Risk Assessment for Building Systems. Professional qualification for construction and maintenance personnel and employers to identify and manage potentially hazardous exposure to bloodborne, waterborne and airborne pathogens. Also includes qualifications for members of a water safety team involved in the development of a risk assessment analysis, and water management and sampling plan, for protection from Legionella and other waterborne pathogens and persons who conduct a facility risk assessment and implement a water safety and management program to reduce the risk of infections due to Legionella. Qualifications are in accordance with ASSE/IAPMO/ANSI Series 12000.

    H 102.5.1 Qualification for Environment of Care, Infection Control and Construction Risk Assess- ment. Professional qualification for general knowledge of the environment of care, infection control and construction risk assessment procedures to protect facility operations, occupants, workers or any individual who has the potential for harm caused by construction activities shall be in accordance with ASSE 12010.

    H 102.5.2 Qualification for Environment of Care, Infection Control and Construction Risk Assess- ment Professional Qualification Standard for Construction and Maintenance Employers. Professional qualification for general knowledge of the environment of care, infection control and construction risk assessment requirements and procedures to protect facility operations, occupants, workers, or any individual who has the potential for harm caused by construction activities shall be in accordance with ASSE 12020. It also provides general knowledge of employer responsibilities to the worker and to the facility. H 102.5.3 Qualification for Water Quality Pro- gram, Pipefitters and HVAC Technicians. Professional qualification for water quality program for pipe fitters and HVAC technicians shall be in accordance with

    ASSE 12062.

  • CALGreen § 1104.0. Medium relevance — show source text

    4 only|Any|Any| |E|Group A1 or A2L4 only|Any|Any| |F-1|Group A12 or A2L2,4 only|Any|Any| |F-2|Any2|Any|Any| |H-1|Any|Any|Any| |H-2|Any|Any|Any| |H-3|Any|Any|Any| |H-4|Group A1 or A2L4 only|Any|Any| |H-5|Group A1 or A2L4 only|Any|Any| |I-1|None|Any|Any| |I-2|Group A1 or A2L4 only|Any|Any| |I-3|None|Any|Any| |I-4|Group A1 or A2L4 only|Any|Any| |M|Group A12 or A2L2,4 only|Any|Any| |R-1|Group A1 or A2L4 only|Any|Any| |R-2|Group A1 or A2L4 only|Any|Any| |R-3|Group A1 or A2L4 only|Any|Any| |R-4|Group A1 or A2L4 only|Any|Any| |S-1|Group A12 or A2L2,4 only|Any|Any| |S-2|Any2|Any|Any| |U|Any|Any|Any|

    Notes: 1 See Section 1104.0. 2 A refrigerant shall be permitted to be used within a high-probability system where the room or space is in accordance with Section 1104.4. 3 Occupancy classifications are defined in the building code. 4 See Section 1104.6 for requirements applicable to A2L equipment.

    independent circuit of high-probability systems shall not exceed the amounts shown in Table 1102.3, except as provided in Section 1104.3, Section 1104.4, and Section 1104.6. The volume of occupied space shall be determined in accordance with Section 1104.2.1 through Section 1104.2.3. Exceptions: (1) Listed equipment in locations other than public corridors and lobbies containing not more than 6.6 pounds (2.99 kg) of refrigerant, regardless of its refrigerant safety classification, provided the equipment is installed in accordance with the listing and with the manufacturer’s installation instructions.

    (2) Listed equipment for use in laboratories with more than 100 square feet (9.29 m [2] ) of space per person, regardless of the refrigerant safety classification, provided that the equipment is installed in accordance with the listing and the manufacturer’s installation instructions. {ASHRAE 15:7.2}

    1104.2.1 Volume Calculations. The volume used to convert from refrigerant concentration limits to refrigerating system quantity limits for refrigerants in Section 1104.2 shall be based on the volume of space to which refrigerant disperses in the event of a refrigerant leak.

    [ASHRAE 15:7.3]

  • CALGreen § 102.5.2 Medium relevance — show source text

    H 102.5.2 Qualification for Environment of Care, Infection Control and Construction Risk Assess- ment Professional Qualification Standard for Construction and Maintenance Employers. Professional qualification for general knowledge of the environment of care, infection control and construction risk assessment requirements and procedures to protect facility operations, occupants, workers, or any individual who has the potential for harm caused by construction activities shall be in accordance with ASSE 12020. It also provides general knowledge of employer responsibilities to the worker and to the facility. H 102.5.3 Qualification for Water Quality Pro- gram, Pipefitters and HVAC Technicians. Professional qualification for water quality program for pipe fitters and HVAC technicians shall be in accordance with

    ASSE 12062.

    H 102.5.4 Legionella Water Safety and Manage- ment Personnel. Professional qualification of persons who conduct a facility risk assessment and implement a water safety and management program to reduce the risk of infections due to Legionella shall be in accordance with ASSE 12080.

    2025 CALIFORNIA MECHANICAL CODE 551

    ), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.

    552 2025 CALIFORNIA MECHANICAL CODE

    ), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.

    CALIFORNIA MECHANICAL CODE – MATRIX ADOPTION TABLE

    APPENDIX I – INDOOR HORTICULTURAL FACILITIES

    (Matrix Adoption Tables are non-regulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)

    Adopting Agency BSC BSC-
    CG    		 SFM HCD Col6 Col7 DSA Col9 Col10 OSHPD Col12 Col13 Col14 Col15 Col16 Col17 BSCC DPH AGR DWR CEC CA SL SLC
    Adopting Agency BSC BSC-
    CG    		 SFM 1 2 1-AC AC ** SS** ** SS/CC** 1 1R 2 3 4 5 6 6 6 6 6 6 6 6 6
    Adopt Entire Chapter
    Adopt Entire Chapter as
    amended (amended sections
    listed below)
    Adopt only those sections
    that are listed below
    Chapter/Section

    This state agency does not adopt sections identified with the following symbol: The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.0.

    2025 CALIFORNIA MECHANICAL CODE 553

  • CALGreen § 3-4 Medium relevance — show source text

    302 Mixed Occupancy Buildings . . . . . . . . . . . . . . . . . . . . . . .3-4 303 Phased Projects. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4 304 Voluntary Tiers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4 305 CALGreen Tier 1 and CALGreen Tier 2 . . . . . . . . . . . . . .3-4

    306 Voluntary Measures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4

    CHAPTER 4 RESIDENTIAL MANDATORY MEASURES . . . . . . 4-3

    4.1 Planning and Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3 4.2 Energy Efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-7 4.3 Water Efficiency and Conservation . . . . . . . . . . . . . . . . .4-9 4.4 Material Conservation and Resource Efficiency . . . . 4-11 4.5 Environmental Quality . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13

    CHAPTER 5 NONRESIDENTIAL MANDATORY MEASURES . . 5-3

    5.1 Planning and Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-3 5.2 Energy Efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15 5.3 Water Efficiency and Conservation . . . . . . . . . . . . . . . 5-19 5.4 Material Conservation and Resource Efficiency . . . . 5-23 5.5 Environmental Quality . . . . . . . . . . . . . . . . . . . . . . . . . . 5-31

    CHAPTER 6 REFERENCED ORGANIZATIONS

    AND STANDARDS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

    601 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-3

    CHAPTER 7 INSTALLER AND SPECIAL

    INSPECTOR QUALIFICATIONS . . . . . . . . . . . . . . . . . . . . . . 7-3 701 General (Reserved) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-3 702 Qualifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-3

  • CALGreen § 5.5 Medium relevance — show source text

    DIVISION 5.5 – ENVIRONMENTAL QUALITY

    SECTION 5.501—GENERAL

    5.501.1 Scope. The provisions of this chapter shall outline means of reducing the quantity of air contaminants that are odorous, irritating and/or harmful to the comfort and well-being of a building’s installers, occupants and neighbors.

    SECTION 5.502—DEFINITIONS

    5.502.1 Definitions. The following terms are defined in Chapter 2.

    1 BTU/HOUR.

    ARTERIAL HIGHWAY.

    A-WEIGHTED SOUND LEVEL (dBA).

    COMMUNITY NOISE EQUIVALENT LEVEL (CNEL).

    COMPOSITE WOOD PRODUCTS.

    DAY-NIGHT AVERAGE SOUND LEVEL (Ldn).

    DECIBEL (dB).

    ENERGY EQUIVALENT (NOISE) LEVEL (L eq ).

    EXPRESSWAY.

    FREEWAY.

    GLOBAL WARMING POTENTIAL (GWP).

    GLOBAL WARMING POTENTIAL VALUE (GWP VALUE).

    HIGH-GWP REFRIGERANT.

    LONG RADIUS ELBOW.

    LOW-GWP REFRIGERANT.

    MERV.

    MAXIMUM INCREMENTAL REACTIVITY (MIR).

    PRODUCT-WEIGHTED MIR (PWMIR).

    PSIG.

    REACTIVE ORGANIC COMPOUND (ROC).

    SCHRADER ACCESS VALVES.

    SHORT RADIUS ELBOW.

    SUPERMARKET.

    VOC.

    SECTION 5.503—FIREPLACES

    5.503.1 Fireplaces. Install only a direct-vent sealed-combustion gas or sealed wood-burning fireplace, or a sealed woodstove or pellet stove, and refer to residential requirements in the California Energy Code, Title 24, Part 6, Subchapter 7, Section 150. Woodstoves, pellet stoves and fireplaces shall comply with applicable local ordinances.

    5.503.1.1 Woodstoves. Woodstove and pellet stoves shall comply with US EPA New Source Performance Standards (NSPS) emission limits as applicable, and shall have a permanent label indicating they are certified to meet the emission limits.

    SECTION 5.504—POLLUTANT CONTROL

    5.504.1 Temporary ventilation. The permanent HVAC system shall only be used during construction if necessary to condition the building or areas of addition or alteration within the required temperature range for material and equipment installation. If the HVAC system is used during construction, use return air filters with a Minimum Efficiency Reporting Value (MERV) of 13, based on ASHRAE 52.2. Replace all filters immediately prior to occupancy, or, if the building is occupied during alteration, at the conclusion of construction.

    5.504.2 Reserved.

    5.504.3 Covering of duct openings and protection of mechanical equipment during construction. At the time of rough installation and during storage on the construction site until final startup of the heating, cooling and ventilating equipment, all duct and

    2025 CALIFORNIA GREEN BUILDING STANDARDS CODE 5-31

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    NONRESIDENTIAL MANDATORY MEASURES

  • CALGreen § 12000-2021 Medium relevance — show source text

    Gas Systems Maintenance Personnel|Professional
    Qualifications| |ASSE/IAPMO/ANSI 7010-
    2020|Installers of Residential Potable Water Fire Sprinkler Systems for One- and Two-
    Family Dwellings|Professional
    Qualifications| |ASSE/IAPMO/ANSI 7020-
    2020|Inspectors of Residential Potable Water Fire Sprinkler Systems for One- and Two-
    Family Dwellings|Professional
    Qualifications| |ASSE/IAPMO/ANSI Series
    12000-2021|Professional Qualifications Standard for Water Management and Infection Control
    Risk Assessment for Building Systems|Professional
    Qualifications| |ASSE/IAPMO/ANSI
    12020-2021|Environment of Care, Infection Control and Construction Risk Assessment Profes-
    sional Qualification Standard for Construction and Maintenance Employers|Professional
    Qualifications| |ASSE/IAPMO/ANSI
    12060-2021|Water Quality Program Professional Qualifications Standard for Employers and Des-
    ignated Representatives|Professional
    Qualifications| |ASSE/IAPMO/ANSI
    12061-2021|Water Quality Program Professional Qualifications Standard for Plumbers|Professional
    Qualifications| |ASSE/IAPMO/ANSI
    12062-2021|Water Quality Program Professional Qualifications Standard for Pipefitters and
    HVAC Technicians|Professional
    Qualifications| |ASSE/IAPMO/ANSI
    12063-2021|Water Quality Program Professional Qualifications Standard for Sprinkler Fitters|Professional
    Qualifications| |ASSE/IAPMO/ANSI
    12080-2021|Professional Qualifications Standard for Legionella Water Safety and Management
    Specialist|Professional
    Qualifications| |ASSE/IAPMO/ANSI Series
    13000-2015 (R2020)|Service Plumber and Residential Mechanical Service Technician Professional Quali-
    fications Standard|Professional
    Qualifications| |ASSE/IAPMO/ANSI
    13010-2015 (R2020)|Professional Qualifications Standard for the Service Plumber|Professional
    Qualifications| |ASSE/IAPMO/ANSI Series
    16000-2019|Professional Qualifications Standard for Inspectors and Plans Examiners|Professional
    Qualifications| |ASSE/IAPMO/ANSI
    16010-2019|Plumbing Inspector|Professional
    Qualifications| |ASSE/IAPMO/ANSI
    16040-2019|Plumbing Plan Examiner|Professional
    Qualifications| |ASSE/ARCSA/IAPMO/
    ANSI Series 21000-2017|Rainwater Catchment Systems Personnel|Professional
    Qualifications| |ASSE/IAPMO/ANSI
    21110-2017|Rainwater Catchment Systems Installers|Professional
    Qualifications| |ASSE/IAPMO/ANSI
    21120-2017|Rainwater Catchment Systems Designers|Professional
    Qualifications| |ASSE/IAPMO/ANSI
    21130-2017|Inspectors of Rainwater and Stormwater Catchment Systems|Professional
    Qualifications| |ASTM|ASTM|ASTM| |ASTM A48/A48M-2003
    (R2021)|Standard Specification for Gray Iron Castings|Piping, Ferrous|

    2025 CALIFORNIA PLUMBING CODE 353

Frequently asked questions

May an uncertified worker solder refrigerant lines?

Yes — but only if the uncertified worker is performing that task while directly supervised and under the responsibility of a certified HVAC installer or HVAC‑licensed contractor as required by § 702.1. The code does not separately prohibit specific tasks, but supervision is mandatory.

Does CALGreen set how many uncertified workers one certified supervisor can oversee?

No. § 702.1 does not set numeric crew ratios or maximums; such operational details are left to the enforcing agency or other governing authorities.

Is manufacturer product training acceptable as certification?

Manufacturer‑sponsored training is listed as an example of acceptable programs in § 702.1, but the enforcing agency must accept the program for it to qualify.

Do I need to provide proof of the supervisor’s certification to the inspector?

Yes — documentation methods acceptable to the enforcing agency (plans, installer certification, inspection reports, etc.) are described in § 703.1; include the certified person’s credentials in the project records.

If a contractor is licensed but not personally certified, can they supervise uncertified workers?

Yes. § 702.1 permits uncertified persons to work under the supervision and responsibility of either a person trained and certified or a contractor licensed to install HVAC systems.

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