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C&S Resources
Below you can find trusted Codes & Standards resources for various building sectors, such as HERS Rating, Water Heating, and Solar PV/Battery Storage. If you have any questions after viewing these resources, please reach out to info@iren.gov.
2025 Energy Code
- 2025 California Energy Code - 2025 Energy Code Summary from the California Energy Commission
- 2025 California Energy Code Fact Sheet - 2025 Code Fact Sheet from the California Energy Commission
- 2025 Energy Code Overview Presentation - California Energy Commission
- Single-family Buildings: What's Changed in 2025 - Energy Code Ace
- Single-family Buildings: What's New in 2025 - Energy Code Ace
- What's New for Single-Family Residential: 2025 Building Energy Efficiency Standards - California Energy Commission
- 2025 Single-Family Residential Mandatory Requirements Summary - California Energy Commission
- Multifamily Buildings: What's New in 2025 - Energy Code Ace
- Multifamily Buildings: What’s Changed in 2025 - Energy Code Ace
- What's New for Multifamily Buildings: 2025 Building Energy Efficiency Standards - California Energy Commission
- Nonresidential Buildings: What’s New in 2025 - Energy Code Ace
- Nonresidential Buildings: What’s Changed in 2025 - Energy Code Ace
- What's New for Nonresidential Buildings: 2025 Building Energy Efficiency Standards - California Energy Commission
- Nonresidential, Single-family, and Multifamily Pool and Spa Heating 2025 - Energy Code Ace
HERS Rating:
- Home Energy Rating System Program - HERS | California Energy Commission – basics of HERS Rating Program from the CEC, including an FAQ
- Home Energy Rating System Providers (ca.gov) – Avenue to find appropriately certified HERS Raters
- Multifamily HERS Verification Fact Sheet – Energy Code Ace factsheet on HERS Verification for low-rise and high-rise multifamily buildings
- Single-family HERS Verification Fact Sheet – Energy Code Ace factsheet on HERS verification for single-family buildings
- CHEERS - California's Central Energy Code Registry – also approved by the CEC to train HERS Raters and provides other services for building industry workers to register energy code projects electronically
HVAC Systems:
- HVAC (ca.gov) – CEC landing page for all HVAC Energy Code information
- Single-family HVAC Additions and Alterations Fact Sheet – Energy Code Ace
- Residential Minimum Heating and Cooling Efficiencies Quick Reference Sheet – Energy Code Ace
- Nonresidential Small Commercial HVAC Alterations Trigger Sheet – Energy Code Ace
Lighting:
- Lighting (ca.gov) – main CEC page on indoor, outdoor, and sign lighting Energy Code requirements
- Residential Lighting Guide for 2022 Building Energy Efficiency Standards | California Lighting Technology Center (ucdavis.edu) – CEC approved guide on residential lighting in the 2022 Energy Code
- Nonresidential Lighting & Electrical Power Distribution Guide for 2022 Building Energy Efficiency Standards | California Lighting Technology Center (ucdavis.edu) – CEC approved guide on nonresidential lighting in the 2022 Energy Code
- California Lighting Technology Center, UC Davis (YouTube) – CEC approved channel on all lighting technologies and Energy Code compliance
- Residential Lighting Fact Sheet – Energy Code Ace
- Nonresidential and Multifamily Lighting Fact Sheet – Energy Code Ace
- Residential High-efficacy Lighting Fact Sheet – Energy Code Ace sheet including overlap and differences between Title 20 and Title 24
Single-family Residential:
- Single-family Buildings Envelope Fact Sheet – Energy Code Ace
- 2022 Energy Code Changes: Single-family Residential Buildings Fact Sheet – Energy Code Ace
- Single-family Building Accessory Dwelling Units - Energy Code Ace
Solar PV/Battery Storage:
- Nonresidential and High-rise Multifamily Solar and Battery Systems Fact Sheet – Energy Code Ace buildings factsheet
- Single-family and Low-rise Multifamily Solar and Battery Systems Fact Sheet – Energy Code Ace buildings factsheet
- 2022 Single-Family Solar PV (ca.gov) – CEC FAQ on single-family solar PV
- Solar PV, Solar Ready, Battery, and Electric Ready (ca.gov) – CEC page on Solar PV, Solar Ready, Battery, and Electric Ready requirements in the 2022 code.
- Residential Solar Permit Reporting – SB 379 | California Energy Commission – CEC page on SB379/SolarAPP+
Water Heating:
- Water Heating (ca.gov) – main CEC page on water heating standards
- Water Heater Efficiency Guide (ca.gov) – 2022 Water Heater Efficiency Guide for both residential and non-residential
- Water Heater Alterations Individual Dwelling Units (ca.gov) – Water Heater Replacement Guide for prescriptive and performance pathways
- 2022 Energy Code, Single-Family Water Heating Overview (ca.gov) – presentation from the CEC on single family water heating
- 2022 Energy Code, Nonresidential Water Heating Overview (ca.gov) – presentation from the CEC on nonresidential water heating
- 2022 Energy Code, Multifamily Water Heating Overview (ca.gov) – presentation from the CEC on multifamily water heating
- Water Heating Energy Code Guidelines Fact Sheet (windows.net) – Energy Code Ace factsheet on single family, multifamily, hotel, and motel hot water heating
- Residential Water Heaters: Guide to 2022 Energy Code Requirements (bayren.org) – BayREN resource on residential water heating, for both new construction and water heater replacements
- TECH Public Reporting Home Page (techcleanca.com) – landing page for TECH Clean California, part of an initiative to install heat pump water heaters across California