The Central Valley’s hot summers place real emphasis on cooling performance, insulation, and HVAC efficiency in Title 24 energy modeling.
Title 24 in a Hot-Summer Valley
The Central Valley runs from the San Joaquin County area in the north to Kern County in the south. Summers are long, hot and dry, and winters are cool and often foggy, so the energy model has to balance a large cooling load with real heating needs. Ceiling and wall insulation, window area and orientation, duct location and heat pump efficiency all carry significant weight. Our Title 24 calculations guide explains how the design is compared with the code's standard design for the same zone.
Central Valley Climate Zones
- Northern San Joaquin Valley — Stockton and Modesto are in Climate Zone 12.
- Southern San Joaquin Valley — Fresno, Visalia and Bakersfield are in Climate Zone 13.
We also serve nearby communities such as Tracy, Turlock, Merced and Clovis. Both zones are among the hotter inland zones in the state, so the same house design can model very differently here than on the coast.
The report always uses the zone assigned to your project address and ZIP code; see the climate zone map for all 16 zones.
Common Central Valley Projects
- New single-family homes in expanding subdivisions — see new construction Title 24
- ADUs on larger residential lots — see ADU Title 24 reports
- HVAC changeouts to heat pumps, where cooling equipment runs hard — see the HVAC replacement service
- Additions to existing homes — see the home addition service
For the wider region, see Northern California Title 24.
Frequently Asked Questions
What usually decides compliance in the Central Valley?
Cooling. West-facing glass, attic insulation, ducts in a hot attic and cooling efficiency tend to have the biggest effect. Choosing these early makes compliance easier.
Do Central Valley homes need solar?
Most newly constructed single-family homes do. Additions and many ADUs have exceptions, and the report determines what applies. See Title 24 requirements.
