West · Climate zones 2–6
HVAC service in California
California spans mild coastal climates, hot inland valleys, deserts and cold mountains. San Diego and San Francisco need little cooling, while Sacramento, Fresno, Riverside and the deserts face long, hot summers. Statewide energy codes and incentives push toward heat pumps.
- 1,984 ZIP codes covered
- 779 cities and towns
- Licensed contractors
California HVAC at a glance
- Climate
- Mixed (IECC zones 2–6)
- What it means
- Real heating and cooling seasons. Heat pumps and dual-fuel systems are popular, and both spring and fall maintenance pay off.
- Common systems
- Gas furnace + central AC, Heat pumps, Ductless mini-splits, High-MERV filtration
- Coverage
- 1,984 ZIP codes in 779 cities and towns
- Region
- West
Homes & equipment
Heating and cooling in California
Gas furnaces with central AC remain common in older homes, but heat pumps are increasingly standard in new construction and replacements. Title 24 energy rules affect duct sealing and equipment efficiency when systems are replaced.
Wildfire smoke has made filtration and fresh-air control a priority in many regions.
Common problems
HVAC problems we see in California
Wildfire smoke
Better filters, sealed returns and recirculation settings protect indoor air during smoke events.
Title 24 duct requirements
Equipment replacement often triggers duct leakage testing and sealing under state energy rules.
Inland heat
Central Valley and Inland Empire homes need strong cooling in long, hot summers.
City guides
HVAC city guides in California
Recommended
Services California homeowners need most
California
HVAC services in California
Contractor licensing in California
California licenses HVAC contractors through the Contractors State License Board (CSLB), usually under the C-20 Warm-Air Heating, Ventilating and Air-Conditioning classification.
Utilities in California
PG&E, Southern California Edison, SDG&E and municipal utilities such as LADWP and SMUD supply electricity. SoCalGas, PG&E and SDG&E supply natural gas.
FAQ
California HVAC questions
Does replacing my AC in California require a duct test?+
Often yes. Title 24 rules generally require duct leakage testing when HVAC equipment is replaced, with a HERS rater verifying the results.
Are heat pumps good for California?+
Yes. Most of California's climate suits heat pumps well, and state and utility incentives often support them.
Other states in the West
HVAC help in California
Call to be connected with a licensed HVAC contractor serving your ZIP code.