California Climate Zone 12 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 12 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.
What Climate Zone 12 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 12 is one of them.
Why Climate Zone 12 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 12 and What It Means for Your Report
Climate Zone 12 covers the Sacramento area and the northern San Joaquin Valley, including Sacramento, Stockton and Modesto, along with inland East Bay cities such as Concord and Walnut Creek. Summers are hot and dry, though evening breezes from the Delta bring some relief to parts of the zone, and winters are cool and often foggy.
The energy model in Zone 12 weighs both heating and cooling. Summer performance depends heavily on windows and shading, attic and roof design, and ducts that are well sealed and ideally kept out of hot attics. Winter performance depends on insulation and air sealing. Efficient heat pump space and water heating help on both fronts, which is why they appear in so many compliant designs in this zone.
Cities & areas in Climate Zone 12
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 12.
California Title 24 Climate Zone 12. Your project's zone is set by its address; see the California Energy Commission's official climate zone map for boundaries.
How Zone 12 affects HVAC
The zone's climate influences how heating and cooling are weighted in the model. Current Title 24 favors heat pumps statewide. Zone 12 HVAC requirements →
How Zone 12 affects windows
U-factor and SHGC targets are influenced by the zone's climate. Zone 12 window requirements →
How Zone 12 affects insulation
Wall, roof, and floor performance is measured against the zone's energy budget. Zone 12 insulation requirements →
How Zone 12 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 12, taken from the California Energy Commission's official table, or use the climate zone ZIP code lookup.
Title 24 Guides for Climate Zone 12
The Climate Zone 12 Title 24 requirements page gives the full overview. From there, read Zone 12 HVAC requirements, Zone 12 heat pump requirements and Zone 12 window requirements. The Zone 12 ADU guide and Zone 12 new home guide cover the most common projects, and Title 24 cost in Zone 12 covers pricing. For statewide background, see California Title 24 requirements and Title 24 calculations. City guides include Sacramento and Stockton.
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