San Gabriel, CA: the heat pump payback math
A heat pump earns back its extra cost in San Gabriel within a sensible timeframe. 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). That premium is recovered through $323 of lower running costs every year, landing the payback clock at roughly 3.1 years. That's a real payback, built from San Gabriel's own climate and utility rates, not a national guess.
Why San Gabriel's climate drives this number
Degree days tell the story here: San Gabriel 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. 39.2°F is the figure equipment gets sized against here — the 99th-percentile cold snap, not an average day — with a record low of 37.4°F on file. Worked through the model, that's a seasonal COP of 3.37 on the standard unit fit for this climate. A standard ducted system is enough here; San Gabriel's design temperature doesn't justify the cold-climate premium. Climate figures trace to the nearest NOAA station, EL MONTE AIRPORT, 3.8 miles from San Gabriel.
San Gabriel's running-cost comparison, in dollars
A 2000-square-foot house here would pull roughly 515 heating kilowatt-hours annually on top of cooling, totalling about $813 a year on electricity. The gas furnace it replaces burns roughly 7 Mcf a year at 22.01 per Mcf here, for a running cost near $1,136 a year (electricity here runs 32.83¢/kWh). Looked at as a full purchase rather than an incremental one, payback here is roughly 34.1 years, leaving the 15-year total $3,842 ahead.
If your home heats with electric baseboard instead of gas
Not every home in San Gabriel has gas service. Against electric-resistance heat — baseboard or an electric furnace, both 100% efficient but still just resistance — the case for switching gets stronger here. About $736 a year comes back this way, enough that the 7.5-year payback clears the $5,500 premium comfortably within the equipment's life.
How San Gabriel compares nationally
San Gabriel lands at position 3005 out of 3206 cities on heating severity (coldest is 1), and 1095 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 for 37,926 people in San Gabriel
About 37,926 people live in San Gabriel, 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, it's worth getting quotes before your current system fails, not after.
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. See what San Gabriel's figure looks like without the $2,000 federal credit in the guide to how that credit moves the payback window.