Heat Pump Payback in Cupertino, CA
Should Cupertino switch to a heat pump?
In Cupertino, a heat pump would cost more to run each year than what you have now. $3,000 is what Cupertino would pay extra to go electric rather than replace the furnace and AC with the same again. Unfortunately the electric bill outweighs the gas bill it replaces by about $2 a year here, so the extra spend stays unrecovered. There's no spin on that: Cupertino's numbers say wait.
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The climate behind Cupertino's payback figure
2250 heating degree days pile up here every year, so Cupertino has a mild winter by US standards; the cooling side runs to 387 cooling degree days, where summers add a moderate cooling load. Sizing runs off the design temperature, not the average day: 35.6°F here (coldest 2024 reading 35.6°F), which works out to a seasonal COP of 3.26 for the standard class of unit this climate calls for. A standard ducted system is enough here; Cupertino's design temperature doesn't justify the cold-climate premium. Climate figures trace to the nearest NOAA station, Moffett Federal Airfield, 6 miles from Cupertino.
The yearly running costs in Cupertino
A 2000-square-foot house here would pull roughly 1,748 heating kilowatt-hours annually on top of cooling, totalling about $682 a year on electricity. The gas furnace it replaces burns roughly 23 Mcf a year at $22.01 per Mcf here, for a running cost near $680 a year including the old AC (electricity here runs 32.83¢/kWh). With running costs higher every year, there is no payback at any purchase price; over 15 years, against a like-for-like replacement, a household here would end $3,025 behind.
How sensitive Cupertino's result is to prices
The heat pump would become the cheaper option in Cupertino if electricity fell to 32.7¢/kWh (from 32.83¢) or gas rose above $22.08 per Mcf (from $22.01). At today's prices a cheaper quote cannot rescue the gas comparison in Cupertino, since there is no yearly saving to recover it from.
Electric resistance heat in Cupertino, compared
Gas isn't universal in Cupertino, many houses run on electric heat already. Compared with baseboard or electric-furnace resistance heat, the numbers shift in the heat pump’s favor. About $1,353 a year comes back this way, enough that the 5.5-year payback clears the $7,500 premium comfortably within the equipment's life.
Where Cupertino ranks in this dataset
Among 3206 cities, Cupertino's winter puts it at rank 2305 for severity, while its size puts it at rank 692 for population, 1 in both cases being the extreme. That's the mildest third of cities covered, where utility rates carry more of the answer than climate does.
Deciding what's next in Cupertino, CA
About 58,710 people live in Cupertino, 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.
Ask a local HVAC contractor for a quote before committing either way.
Reading further on this page's numbers
Nothing above is a black box: the methodology guide shows the full arithmetic behind Cupertino's 3.26 seasonal COP and payback figure. The guide on cities that never pay back covers exactly Cupertino's situation: a genuinely higher annual running cost, not a slow one.