Corona, CA: the heat pump payback math
In Corona, the extra upfront cost technically comes back, just not before the equipment wears out. 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). Corona's residents would see roughly $61 a year back in running costs, putting the payback around 16.4 years. That's a technicality, not a recommendation, for anyone actually living in Corona.
How cold Corona actually gets
Corona has a mild winter by US standards — 1830 heating degree days a year against a 65°F base — and summers are hot enough that cooling matters as much as heating, at 1020 cooling degree days. The 99% winter design temperature here — the cold snap equipment must be sized for, not the seasonal average — is 27°F, against a record low of 26.1°F. That puts the seasonal coefficient of performance at 3 for the recommended standard unit. Corona's winters don't get cold enough to need the cold-climate premium — a standard unit holds up fine. These numbers come from CORONA MUNICIPAL AIRPORT, the closest NOAA station, 3.3 miles out.
The month-to-month numbers for Corona
Electricity use for heating alone comes out to about 1,545 kWh a year on the 2000-square-foot reference house; folding in cooling puts the electric bill near $793 a year. Corona's gas rate of 22.01 per Mcf, applied to the 19 Mcf a year the furnace burns, puts its running cost near $853 a year, against 32.83¢ per kWh for electricity. Priced as a standalone purchase rather than against a like-for-like replacement, equipment payback runs about 180.7 years, for a 15-year net position $87 behind.
The other scenario: no gas furnace to begin with
Gas isn't universal in Corona — many houses run on electric heat already. Swap the comparison to resistance heat instead of gas, and Corona's answer improves. Switching saves about $1,163 a year here — a heat pump moving heat rather than generating it needs far less electricity than resistance coils — so the extra $5,500 spent up front comes back in about 4.7 years.
Corona against the rest of the country
Among 3206 cities, Corona's winter puts it at rank 2520 for severity, while its size puts it at rank 164 for population — 1 in both cases being the extreme. 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 Corona
Corona, California is home to about 161,540 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 Corona, nothing is lost by holding off until the current equipment genuinely fails.
Ask a local HVAC contractor for a quote before committing either way.
Where Corona's figure comes from
The methodology guide walks through exactly how Corona's 3 seasonal COP and the rest of this page's numbers get built. Corona technically clears a payback on paper, just past the equipment's own working life — the no-payback guide explains why that distinction matters.