California Title 24 Requirements
Title 24 is California’s building energy code. Below is a clear overview of solar requirements for new residential construction and updated pool heating rules taking effect January 1, 2026.
Solar PV Requirements for New Homes
How solar requirements are determined
Title 24 solar requirements are calculated as a system size (kW), not a fixed square footage of panels.
- Based on conditioned floor area and climate zone
- Calculated using Title 24 compliance methods
- Requirements vary by home size and location
Important clarifications
- Gas appliances do not create a separate minimum solar rule
- Mixed-fuel homes are already accounted for
- Local enforcement may vary by jurisdiction
When solar may not be required
Exceptions may apply due to roof limitations, shading, structural feasibility, very small calculated system size, or approved community solar participation.
Pool Heating Requirements (Effective January 1, 2026)
Primary heating source requirements
For new pools or first-time heater installations, gas may no longer serve as the sole primary heat source.
- Solar thermal pool heating
- Electric heat pump pool heaters
- Hybrid renewable systems
Gas heaters after 2026
Gas heaters remain allowed as supplemental or backup heat when paired with a compliant primary heating system.
- Solar thermal + gas backup
- Heat pump + gas backup
- Hybrid renewable systems
Frequently Asked Questions
Does adding gas equipment increase solar requirements?
No. Mixed-fuel homes are already accounted for in Title 24 calculations.
Can I still install a gas pool heater after January 1, 2026?
Yes, but not as the sole primary heat source. Gas may be used as backup when paired with a compliant system.
How do I know what applies to my project?
Requirements vary by project scope and location. Contact Revco for guidance.
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