Heat pumps in San Diego

Climate and sizing

Winters are mild, so almost any certified heat pump can heat the house; cooling efficiency and quiet running decide the choice. This is a dry climate: look at EER2, the efficiency on the hottest afternoons, as well as SEER2. Whatever the climate, the system should be sized from a room-by-room load calculation (ACCA Manual J), not from the size of the old air conditioner or furnace: an oversized heat pump short-cycles, dehumidifies poorly and costs more.

IECC 2021 climate zone

3B

Heating degree days (65°F)

990

Cooling degree days (65°F)

893

Weather station

SAN DIEGO LINDBERGH FLD, CA US

Seasonal COP for planning

2.8 cold-climate · 2.5 standard

Typical home

built around 1979; 47% owner-occupied

Degree days: NOAA 1991–2020 climate normals. Climate zone: IECC 2021 (PNNL county list). Housing: Census American Community Survey. Seasonal COP: Seasonal COP for a whole heating season, including electric backup heat and defrost, for a heat pump sized for mild to cold weather. Planning values set slightly below modelled results (Dunsky/CCI 2024) because field studies (RDH for FortisBC; Yukon pilot) came in lower. Above 6,000 degree-days the values rest on one partial-season pilot in Whitehorse, so we use the low end of the band from 7,000 degree-days (Yellowknife).

What heat costs to run in San Diego

Cost per million Btu of heat delivered into the house, at California's average residential prices from the EIA (electricity for July 2026, gas as an annual average). A typical older house in a cold climate uses 50 to 100 million Btu of heat a year; a house in the South uses far less. Here a heat pump needs a seasonal COP above 4.4 to beat a 95% gas furnace, so at these prices gas stays cheaper to run; the case for a heat pump rests on replacing the air conditioner, cutting emissions or a time-of-use rate.

Against electric resistance heat (baseboards or an electric furnace), even a standard heat pump cuts the heating bill by about 60%.

Prices: EIA electricity · EIA natural gas. Your own rate plan may differ, especially on a time-of-use or heat pump rate.

Heat pump rebates in San Diego

Every heat pump program we found for the San Diego area, with the equipment rule that decides which models qualify. Checked against each program's own page on October 19, 2026. Most utility programs need an AHRI-matched system; check the exact pairing in the AHRI directory before you sign.

Federal

Audit programs, other rebates and help for lower-income homes: our San Diego guide.

Systems that suit San Diego

The certified systems that heat most efficiently at 5°F, and those that cool most efficiently, on current refrigerants, from ENERGY STAR's US listings. Rebadged twins with identical ratings are folded into one row.

Central systems that cool most efficiently

Central systems that heat best in the cold (2 tons and up)

Mini-splits that cool most efficiently

Brands with the most cold-climate models

Outdoor models that meet ENERGY STAR Cold Climate, by brand. Each brand page has the warranty, product lines and best models.

Compare every brand · All 43 brand pages and every certified name