Heat Pump Payback in Fullerton, CA
Fullerton, CA: the heat pump payback math
Fullerton technically pencils out, but only past the point the equipment would need replacing anyway. Against a like-for-like gas furnace and AC swap, going electric costs $3,000 more up front here. That premium is recovered through $125 of lower running costs every year, landing the payback clock at roughly 24 years. Fullerton's own numbers say this pencils out only in theory, not in practice.
Not the city you meant?
This runs the same numbers for 3206 US cities, not just Fullerton. Look one up here.
The climate behind Fullerton's payback figure
1315 heating degree days pile up here every year, so Fullerton barely has a winter to speak of; the cooling side runs to 1024 cooling degree days, where summers are hot enough that cooling matters as much as heating. 39°F is the figure equipment gets sized against here, the 99th-percentile cold snap, not an average day, with a low of 35.1°F in the 2024 station record. Worked through the model, that's a seasonal COP of 3.36 on the standard unit fit for this climate. A standard ducted system is enough here; Fullerton's design temperature doesn't justify the cold-climate premium. Source: NOAA station Fullerton Municipal Airport, 3.1 miles from Fullerton, the closest one on record.
Fullerton's running-cost comparison, in dollars
Modelled on a typical 2000-square-foot house, the heat pump draws about 991 kWh a year to keep it warm, plus cooling, for a combined electric bill near $612 a year. That compares with roughly 14 Mcf a year of gas at Fullerton's $22.01 per-Mcf rate, about $737 a year with the old AC included, against a local electricity rate of 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 $1,123 behind.
How sensitive Fullerton's result is to prices
This result holds unless electricity climbs above 56.1¢/kWh (it is 32.83¢ now) or gas drops below $12.87 per Mcf (now $22.01); past either point, gas becomes the cheaper fuel in Fullerton. When quotes arrive, compare the heat pump price with a like-for-like furnace and AC replacement: at $125 a year saved, a difference under $875 pays back within 7 years here, and under $1,250 within 10.
If your home heats with electric baseboard instead of gas
Not every home in Fullerton has gas service. Swap the comparison to resistance heat instead of gas, and Fullerton's answer improves. Switching saves about $917 a year here, a heat pump moving heat rather than generating it needs far less electricity than resistance coils, so the extra $7,500 spent up front comes back in about 8.2 years.
Fullerton against the rest of the country
Fullerton lands at position 2751 out of 3206 cities on heating severity (coldest is 1), and 202 out of 3206 by population size (biggest is 1). That's the mildest third of cities covered, where utility rates carry more of the answer than climate does.
What to do with this number in Fullerton
About 140,054 people live in Fullerton, 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.
More on how this number was built
The methodology guide walks through exactly how Fullerton's 3.36 seasonal COP and the rest of this page's numbers get built. Fullerton's case is the "pays back too slowly to count" kind covered in the guide to cities where the math never really works.