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Earlier editions: 20222019

Chapter 4 — RESIDENTIAL MANDATORY MEASURES

4.507 Environmental Comfort — 2025 California Green Building Standards Code

California Green Building Standards Code (Title 24, Part 11) · 2025 edition · updated 2026-09-25 · California

CBSC: official editions, supplements and errata

Cite as: 2025 California Green Building Standards Code (Title 24, Part 11) § 4.507 · Effective January 1, 2026 · Official source: Building Standards Commission

4.507.1 Reserved.

RESIDENTIAL MANDATORY MEASURES

4.507.2 Heating and air-conditioning system design. Heating and air-conditioning systems shall be sized, designed and have their equipment selected using the following methods:

  1. The heat loss and heat gain is established according to ANSI/ACCA 2 Manual J—2016 ( Residential Load Calculation ), ASHRAE handbooks or other equivalent design software or methods.
  2. Duct systems are sized according to ANSI/ACCA 1 Manual D—2016 ( Residential Duct Systems ), ASHRAE handbooks or other equivalent design software or methods.
  3. Select heating and cooling equipment according to ANSI/ACCA 3 Manual S—2014 ( Residential Equipment Selection ) or other equivalent design software or methods.

Exception: Use of alternate design temperatures necessary to ensure the systems function are acceptable.

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▸Contents — California Green Building Standards Code (Title 24, Part 11)
California Green Building Standards Code (Title 24, Part 11)

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