Climate Zone 8: Inland South Coast
Warmer inland valleys with hot summer afternoons.
Every Title 24 energy calculation uses the climate zone of the building’s physical location. In Zone 8, the climate is mixed, which shapes which building features have the most effect on compliance.
Typical project considerations
- Cooling loads rise; window SHGC and attic insulation matter.
- Duct location (attic vs conditioned space) can swing results.
General guidance only — requirements depend on building type, scope and the code edition in effect for your permit application.
Example communities
Anaheim · Irvine · Fullerton
City guides: Los Angeles · Anaheim · Irvine
Official references
Frequently asked questions
Where is California Climate Zone 8?
Climate Zone 8 (Inland South Coast) covers areas such as Inland Orange County & LA basin. Its representative weather city in CEC data is Fullerton. Boundaries don’t follow city limits, so confirm by address.
Does Climate Zone 8 change my Title 24 requirements?
Yes. All Energy Code calculations use the project’s climate zone, which affects prescriptive values such as insulation and window performance and how heating and cooling are weighted in performance modeling.
What report do I need?
Single-family projects use CF1R, low-rise multifamily uses LMCC and nonresidential projects use NRCC forms — regardless of climate zone.
Ready to get your Title 24 report?
Upload your plans in minutes. We’ll handle the modeling, the forms and the plan-check revisions.