Will a heat pump pay off in El Cajon, CA?
This one's marginal in El Cajon: it only clears if you stay long enough. $1,000 is what El Cajon would pay extra to go electric rather than replace the furnace and AC with the same again, once the $2,000 federal credit is applied. Lower bills claw that back: about $103 saved annually, for a payback of roughly 9.7 years. Whether that's worth it in El Cajon depends on how many years you expect to own the place.
Why El Cajon's climate drives this number
1807 heating degree days pile up here every year, so El Cajon has a mild winter by US standards; the cooling side runs to 1027 cooling degree days, where summers are hot enough that cooling matters as much as heating. The 99% winter design temperature here — the cold snap equipment must be sized for, not the seasonal average — is 35.6°F, against a record low of 32°F. That puts the seasonal coefficient of performance at 3.26 for the recommended standard unit. A standard ducted system is enough here; El Cajon's design temperature doesn't justify the cold-climate premium. These numbers come from GILLESPIE FIELD AIRPORT, the closest NOAA station, 1.8 miles out.
The month-to-month numbers for El Cajon
Electricity use for heating alone comes out to about 1,404 kWh a year on the 2000-square-foot reference house; folding in cooling puts the electric bill near $748 a year. El Cajon's gas rate of 22.01 per Mcf, applied to the 19 Mcf a year the furnace burns, puts its running cost near $851 a year, against 32.83¢ per kWh for electricity. Looked at as a full purchase rather than an incremental one, payback here is roughly 106.9 years, leaving the 15-year total $544 ahead.
The other scenario: no gas furnace to begin with
Gas isn't universal in El Cajon — many houses run on electric heat already. Swap the comparison to resistance heat instead of gas, and El Cajon's answer improves. About $1,191 a year comes back this way, enough that the 4.6-year payback clears the $5,500 premium comfortably within the equipment's life.
How El Cajon compares nationally
El Cajon lands at position 2536 out of 3206 cities on heating severity (coldest is 1), and 323 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 103,291 people in El Cajon
About 103,291 people live in El Cajon, 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.
Where El Cajon's figure comes from
The methodology guide walks through exactly how El Cajon's 3.26 seasonal COP and the rest of this page's numbers get built. Not every home in El Cajon has gas; the guide comparing a heat pump against electric baseboard covers that case separately.