Heat Pump Payback in San Diego, CA
San Diego, CA: the heat pump payback math
San Diego technically pencils out, but only past the point the equipment would need replacing anyway. Swap a failed furnace and AC for a heat pump rather than buying like-for-like, and the extra cost here runs $3,000. That premium is recovered through $70 of lower running costs every year, landing the payback clock at roughly 43 years. San Diego's own numbers say this pencils out only in theory, not in practice.
Compare against another city
San Diego is one of 3206 cities covered here, each run through the same model. Search another below.
The climate behind San Diego's payback figure
1529 heating degree days pile up here every year, so San Diego has a mild winter by US standards; the cooling side runs to 694 cooling degree days, where summers add a moderate cooling load. Sizing runs off the design temperature, not the average day: 37.9°F here (coldest 2024 reading 35.1°F), which works out to a seasonal COP of 3.33 for the standard class of unit this climate calls for. A standard ducted system is enough here; San Diego's design temperature doesn't justify the cold-climate premium. Source: NOAA station Montgomery Field Airport, 1.4 miles from San Diego, the closest one on record.
What it actually costs to run, year to year
A 2000-square-foot house here would pull roughly 1,163 heating kilowatt-hours annually on top of cooling, totalling about $576 a year on electricity. The gas furnace it replaces burns roughly 16 Mcf a year at $22.01 per Mcf here, for a running cost near $646 a year including the old AC (electricity here runs 32.83¢/kWh). Buying outright rather than at replacement time stretches payback to longer than the 15-year equipment life. Over 15 years, compared with a like-for-like replacement, the heat pump leaves you $1,953 behind.
How sensitive San Diego's result is to prices
This result holds unless electricity climbs above 41.0¢/kWh (it is 32.83¢ now) or gas drops below $17.63 per Mcf (now $22.01); past either point, gas becomes the cheaper fuel in San Diego. When quotes arrive, compare the heat pump price with a like-for-like furnace and AC replacement: at $70 a year saved, a difference under $490 pays back within 7 years here, and under $700 within 10.
Electric resistance heat in San Diego, compared
Plenty of homes in San Diego heat with electricity alone, no gas line involved. Swap the comparison to resistance heat instead of gas, and San Diego's answer improves. About $990 a year comes back this way, enough that the 7.6-year payback clears the $7,500 premium comfortably within the equipment's life.
Where San Diego ranks in this dataset
Ranked against the other 3206 cities covered, San Diego comes in at 2675 for heating severity, 1 would be the coldest place in the dataset, and 8 by population, where 1 is largest. That's the mildest third of cities covered, where utility rates carry more of the answer than climate does.
Next step if you live in San Diego
About 1,404,452 people live in San Diego, California, and every number on this page is what a contractor would actually work from when quoting a system here, the point isn't to replace that quote, it's to tell you whether to bother asking for one. Here, there's no cost penalty to waiting until your current furnace or AC actually needs replacing.
Get quotes from local HVAC contractors before deciding.
Where San Diego's figure comes from
The methodology guide walks through exactly how San Diego's 3.33 seasonal COP and the rest of this page's numbers get built. San Diego's case is the "pays back too slowly to count" kind covered in the guide to cities where the math never really works.