Heat Pumps in California
A heat pump moves heat rather than burning fuel to make it, so one unit heats in winter and cools in summer. California is actively electrifying buildings, making heat pumps a central part of the state's efficiency and climate strategy.
Last updated: 2026-09-15
How a heat pump heats and cools
In cooling mode it absorbs indoor heat and releases it outside; in heating mode it reverses and pulls heat from outdoor air even in cold weather. Because it moves heat instead of generating it, it can deliver 2–4 units of heat for every unit of electricity used.
Air-source, ducted, and ductless
Air-source heat pumps are most common. Ducted systems use existing ductwork; ductless mini-split heat pumps serve individual rooms or zones. Cold-climate models are designed to keep full output at low outdoor temperatures.
Sizing and the Manual J load calculation
Proper sizing uses an ACCA Manual J calculation that accounts for square footage, insulation, windows, climate, and occupancy. Oversizing short-cycles and dehumidifies poorly; undersizing can't keep up on extreme days. Ask for the load calculation in writing.
Electrical capacity and panel upgrades
A heat pump may need more electrical capacity than the old gas furnace. If your panel is small or full, an electrician may need to upgrade it (see Electricians.com.AI). This cost should be quoted before you sign.
Efficiency ratings: SEER2 and HSPF2
SEER2 measures cooling efficiency; HSPF2 measures heating efficiency. Higher numbers mean lower operating cost. Federal minimums and utility rebate thresholds change, so confirm current standards before buying.
Incentives to ask about
Ask about federal tax credits (IRA §25C), TECH Clean California, and your utility's heat-pump rebates. Eligibility and amounts change; confirm with the program administrator before signing a contract.
Operating cost vs. gas furnace
Heat pumps can lower total energy use, but the actual bill depends on your electricity rate, gas rate, climate, and equipment efficiency. Compare annual operating cost, not just the install price.
Homeowner checklist
- Request a Manual J load calculation
- Confirm electrical panel capacity
- Ask which SEER2/HSPF2 tier qualifies for rebates
- Get permit and HERS testing in writing
- Ask about warranty registration requirements