Heat pump vs. gas furnace in Milpitas, CA
In Milpitas, the math is close enough that it comes down to how long you plan to stay. Against a like-for-like gas furnace and AC swap, going electric costs $1,000 more up front here (already netting out a $2,000 tax credit). Milpitas's residents would see roughly $92 a year back in running costs, putting the payback around 10.8 years. Whether that's worth it in Milpitas depends on how many years you expect to own the place.
Why Milpitas's climate drives this number
Milpitas has a mild winter by US standards — 1672 heating degree days a year against a 65°F base — and summers add a moderate cooling load, at 922 cooling degree days. 36°F is the figure equipment gets sized against here — the 99th-percentile cold snap, not an average day — with a record low of 35.1°F on file. Worked through the model, that's a seasonal COP of 3.27 on the standard unit fit for this climate. A standard ducted system is enough here; Milpitas's design temperature doesn't justify the cold-climate premium. Source: NOAA station N Y. MINETA SN JO INTL APT, 5.4 miles from Milpitas — the closest one on record.
What it actually costs to run, year to year
Modelled on a typical 2000-square-foot house, the heat pump draws about 1,295 kWh a year to keep it warm, plus cooling, for a combined electric bill near $683 a year. Milpitas's gas rate of 22.01 per Mcf, applied to the 17 Mcf a year the furnace burns, puts its running cost near $776 a year, against 32.83¢ per kWh for electricity. Buy it outright, not incrementally, and payback stretches to 119 years; over 15 years the net position sits $386 ahead.
The other scenario: no gas furnace to begin with
Gas isn't universal in Milpitas — many houses run on electric heat already. Against electric-resistance heat — baseboard or an electric furnace, both 100% efficient but still just resistance — the case for switching gets stronger here. About $1,099 a year comes back this way, enough that the 5-year payback clears the $5,500 premium comfortably within the equipment's life.
Milpitas against the rest of the country
Ranked against the other 3206 cities covered, Milpitas comes in at 2601 for heating severity — 1 would be the coldest place in the dataset — and 466 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.
What to do with this number in Milpitas
About 79,746 people live in Milpitas, 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
Nothing above is a black box: the methodology guide shows the full arithmetic behind Milpitas's 3.27 seasonal COP and payback figure. Not every home in Milpitas has gas; the guide comparing a heat pump against electric baseboard covers that case separately.