California Climate Zone 8 is one of the 16 official climate zones the California Energy Commission uses to set Title 24 energy budgets. Title 24 is a statewide California energy code. Climate Zone 8 does not have its own separate rules — the same statewide standards apply, with the energy budget calibrated to this zone's climate. Your project's exact requirements are determined when your specific address is modeled in CEC-approved compliance software.
Title24Comply prepares Title 24 reports for Climate Zone 8 projects across Anaheim, Irvine, Fullerton, Santa Ana and surrounding cities. Pricing starts at $199 for ADUs, $245 for single-family residential and $345 for multifamily, with no zone surcharge. Standard turnaround is 2–3 business days, with rush and same-day options, and you can order online without a phone call.
What Climate Zone 8 means
Each of California's 16 zones reflects distinct temperature, humidity, and solar conditions, and each has its own energy budget under Title 24. Climate Zone 8 is one of them.
Why Climate Zone 8 matters for Title 24
Although the standards are statewide, the budget your design must meet is calibrated to the zone — which can shift the emphasis between insulation, HVAC, windows, and solar. The exact targets are determined when your address is modeled.
The Climate in Zone 8 and What It Means for Your Report
Climate Zone 8 lies just inland from the Southern California coast, taking in inland Orange County cities such as Anaheim, Irvine, Santa Ana and Fullerton. The ocean still moderates winters, but summers are warmer and sunnier than in the coastal zones, and hot spells are more frequent.
That shift means cooling plays a bigger role in the Zone 8 energy model than it does a few miles closer to the ocean. Window solar gain and orientation, attic and roof design, duct location and sealing, and the cooling efficiency of the heat pump or air conditioner all carry real weight. Heating remains a smaller but still measurable part of the budget, and water heating continues to matter as it does statewide.
Cities & areas in Climate Zone 8
Climate zones are assigned by exact project address — often by ZIP code — and a single city can span more than one zone. The cities named on this page are examples only; we always confirm your zone from your project address. Browse our city Title 24 pages or read how cities map to Zone 8.
California Title 24 Climate Zone 8. Your project's zone is set by its address; see the California Energy Commission's official climate zone map for boundaries.
How Zone 8 affects HVAC
The zone's climate influences how heating and cooling are weighted in the model. Current Title 24 favors heat pumps statewide. Zone 8 HVAC requirements →
How Zone 8 affects windows
U-factor and SHGC targets are influenced by the zone's climate. Zone 8 window requirements →
How Zone 8 affects insulation
Wall, roof, and floor performance is measured against the zone's energy budget. Zone 8 insulation requirements →
How Zone 8 affects solar & heat pumps
Solar PV is required for most new low-rise residential statewide, with PV size set by your project; heat pumps are favored under current code. Solar & battery → · Heat pumps →
Common project types
Looking for a specific address? See every city and ZIP code in Climate Zone 8, taken from the California Energy Commission's official table, or use the climate zone ZIP code lookup.
Title 24 Guides for Climate Zone 8
Use the Climate Zone 8 Title 24 requirements page as your overview, then read Zone 8 HVAC requirements, Zone 8 window requirements and Zone 8 insulation requirements, the systems that matter most as summers warm up. Orange County's many backyard units are covered in the Zone 8 ADU guide, and Title 24 cost in Zone 8 covers pricing. For statewide background, see California Title 24 requirements and Title 24 calculations. City guides for this zone include Anaheim and Santa Ana.
Climate zones follow the project address, not just the city name, and one city can straddle two zones. We confirm the exact zone from your address or ZIP code when we model the project; you can also check it yourself with our California climate zone lookup.
Title 24 pricing
- ADU — from $199
- Residential — from $245
- Multifamily — from $345
Standard turnaround: 2–3 business days. Rush (next business day): +$49 ADU / +$99 Residential / +$149 Multifamily. Super Rush (same day — typically completed within a few hours): +$150, subject to availability. Every report includes two revisions. See our pricing page.
What we need
- Architectural plans (PDF)
- Project address (this determines your climate zone)
- Scope of work
- Contact information
- Any plan-check comments (if available)
What we deliver
- Complete Title 24 energy report
- CF1R documentation (LMCC when applicable)
- CHEERS registration completed
- Professionally signed, permit-ready PDF package
- Two Revisions Included