Heat Pump Payback in Duarte, CA
Will a heat pump pay off in Duarte, CA?
This one's marginal in Duarte: it only clears if you stay long enough. 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 $323 of lower running costs every year, landing the payback clock at roughly 9.3 years. Whether that's worth it in Duarte depends on how many years you expect to own the place.
Compare against another city
This runs the same numbers for 3206 US cities, not just Duarte. Look one up here.
Why Duarte's climate drives this number
Degree days tell the story here: Duarte racks up 686 heating degree days each year (base 65°F), and summers are hot enough that cooling matters as much as heating, with 2300 cooling degree days on the cooling side. Sizing runs off the design temperature, not the average day: 39.2°F here (coldest 2024 reading 37.4°F), which works out to a seasonal COP of 3.37 for the standard class of unit this climate calls for. A standard ducted system is enough here; Duarte's design temperature doesn't justify the cold-climate premium. Climate figures trace to the nearest NOAA station, El Monte Airport, 7.2 miles from Duarte.
What it actually costs to run, year to year
Modelled on a typical 2000-square-foot house, the heat pump draws about 515 kWh a year to keep it warm, plus cooling, for a combined electric bill near $813 a year. Duarte's gas rate of $22.01 per Mcf, applied to the 7 Mcf a year the furnace burns, puts the current furnace-and-AC running cost near $1,136 a year, against 32.83¢ per kWh for electricity. Priced as a standalone purchase, with a working furnace ripped out early, payback would take longer than the 15-year equipment life. Measured against the like-for-like replacement instead, a household here ends 15 years $1,842 ahead.
What would change Duarte's answer
Because the heat pump's better air conditioning saves more electricity than its heating uses, it stays cheaper to run than the current furnace and AC in Duarte at any electricity price. When quotes arrive, compare the heat pump price with a like-for-like furnace and AC replacement: at $323 a year saved, a difference under $2,261 pays back within 7 years here, and under $3,230 within 10.
Electric resistance heat in Duarte, compared
Not every home in Duarte has gas service. Compared with baseboard or electric-furnace resistance heat, the numbers shift in the heat pump’s favor. About $736 a year comes back this way, enough that the 10.2-year payback clears the $7,500 premium comfortably within the equipment's life.
How Duarte compares nationally
Duarte lands at position 3010 out of 3206 cities on heating severity (coldest is 1), and 1688 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.
Next step if you live in Duarte
About 23,493 people live in Duarte, 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
Every constant behind this page, the 3.37 seasonal COP, the degree-day corrections, the equipment costs, is documented in the methodology guide. Not every home in Duarte has gas; the guide comparing a heat pump against electric baseboard covers that case separately.