Will a heat pump pay off in Fountain Valley, CA?
In Fountain Valley, 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). Fountain Valley's residents would see roughly $106 a year back in running costs, putting the payback around 9.4 years. It's a genuine toss-up here — Fountain Valley's numbers don't point clearly either way.
Fountain Valley's weather, in the numbers that matter
1159 heating degree days pile up here every year, so Fountain Valley barely has a winter to speak of; the cooling side runs to 804 cooling degree days, where summers add a moderate cooling load. Sizing runs off the design temperature, not the average day: 43°F here (record low 41°F), which works out to a seasonal COP of 3.48 for the standard class of unit this climate calls for. Fountain Valley's winters don't get cold enough to need the cold-climate premium — a standard unit holds up fine. Source: NOAA station J. WAYNE APT-ORANGE CO APT, 5.3 miles from Fountain Valley — the closest one on record.
The month-to-month numbers for Fountain Valley
Electricity use for heating alone comes out to about 843 kWh a year on the 2000-square-foot reference house; folding in cooling puts the electric bill near $502 a year. The gas furnace it replaces burns roughly 12 Mcf a year at 22.01 per Mcf here, for a running cost near $608 a year (electricity here runs 32.83¢/kWh). Priced as a standalone purchase rather than against a like-for-like replacement, equipment payback runs about 103.9 years, for a 15-year net position $588 ahead.
If your home heats with electric baseboard instead of gas
Not every home in Fountain Valley has gas service. Swap the comparison to resistance heat instead of gas, and Fountain Valley's answer improves. About $804 a year comes back this way, enough that the 6.8-year payback clears the $5,500 premium comfortably within the equipment's life.
Where Fountain Valley ranks in this dataset
Ranked against the other 3206 cities covered, Fountain Valley comes in at 2823 for heating severity — 1 would be the coldest place in the dataset — and 733 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.
Next step for 56,036 people in Fountain Valley
Fountain Valley, California is home to about 56,036 people, and the figures above are the same ones a local HVAC contractor uses to size and quote a system — this site doesn't guess where a real quote would land, it just tells you whether it's worth asking for one. In Fountain Valley, nothing is lost by holding off until the current equipment genuinely fails.
Ask a local HVAC contractor for a quote before committing either way.
More on how this number was built
Nothing above is a black box: the methodology guide shows the full arithmetic behind Fountain Valley's 3.48 seasonal COP and payback figure. Homes in Fountain Valley without gas service should read the electric-resistance comparison instead — the numbers there differ from the gas case above.