Lemon Grove, CA: the heat pump payback math
In Lemon Grove, 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). Lower bills claw that back: about $103 saved annually, for a payback of roughly 9.7 years. Whether that's worth it in Lemon Grove depends on how many years you expect to own the place.
Why Lemon Grove's climate drives this number
Lemon Grove has a mild winter by US standards — 1807 heating degree days a year against a 65°F base — and summers are hot enough that cooling matters as much as heating, at 1027 cooling degree days. Sizing runs off the design temperature, not the average day: 35.6°F here (record low 32°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; Lemon Grove's design temperature doesn't justify the cold-climate premium. These numbers come from GILLESPIE FIELD AIRPORT, the closest NOAA station, 7.3 miles out.
The month-to-month numbers for Lemon Grove
Modelled on a typical 2000-square-foot house, the heat pump draws about 1,404 kWh a year to keep it warm, plus cooling, for a combined electric bill near $748 a year. Lemon Grove'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. Buy it outright, not incrementally, and payback stretches to 106.9 years; over 15 years the net position sits $544 ahead.
The other scenario: no gas furnace to begin with
Gas isn't universal in Lemon Grove — 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 $1,191 a year comes back this way, enough that the 4.6-year payback clears the $5,500 premium comfortably within the equipment's life.
Where Lemon Grove ranks in this dataset
Ranked against the other 3206 cities covered, Lemon Grove comes in at 2539 for heating severity — 1 would be the coldest place in the dataset — and 1437 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.
Deciding what's next in Lemon Grove, CA
About 27,867 people live in Lemon Grove, 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 Lemon Grove's 3.26 seasonal COP and payback figure. Not every home in Lemon Grove has gas; the guide comparing a heat pump against electric baseboard covers that case separately.