Ridgefield, WA: the heat pump payback math
This one's marginal in Ridgefield: it only clears if you stay long enough. Against a like-for-like gas furnace and AC swap, going electric costs $3,500 more up front here (already netting out a $2,000 tax credit). Ridgefield's residents would see roughly $311 a year back in running costs, putting the payback around 11.3 years. Whether that's worth it in Ridgefield depends on how many years you expect to own the place.
The climate behind Ridgefield's payback figure
Degree days tell the story here: Ridgefield racks up 4131 heating degree days each year (base 65°F), and summers add a moderate cooling load, with 514 cooling degree days on the cooling side. The 99% winter design temperature here — the cold snap equipment must be sized for, not the seasonal average — is 17.1°F, against a record low of 16°F. That puts the seasonal coefficient of performance at 3.11 for the recommended cold-climate unit. Ridgefield needs the cold-climate class of unit: past a 25°F design temperature a standard heat pump falls back on resistance backup often enough to eat the savings. Climate figures trace to the nearest NOAA station, PEARSON FIELD AIRPORT, 13.6 miles from Ridgefield.
The month-to-month numbers for Ridgefield
Electricity use for heating alone comes out to about 3,363 kWh a year on the 2000-square-foot reference house; folding in cooling puts the electric bill near $542 a year. The gas furnace it replaces burns roughly 43 Mcf a year at 17.62 per Mcf here, for a running cost near $853 a year (electricity here runs 14.27¢/kWh). Looked at as a full purchase rather than an incremental one, payback here is roughly 43.5 years, leaving the 15-year total $1,159 ahead.
The other scenario: no gas furnace to begin with
Gas isn't universal in Ridgefield — 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 $1,045 a year comes back this way, enough that the 7.7-year payback clears the $8,000 premium comfortably within the equipment's life.
Where Ridgefield ranks in this dataset
Ranked against the other 3206 cities covered, Ridgefield comes in at 1436 for heating severity — 1 would be the coldest place in the dataset — and 2359 by population, where 1 is largest. That's the middle third for winter severity among the cities covered here.
What to do with this number in Ridgefield
About 15,359 people live in Ridgefield, Washington, 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.
Line up a few local HVAC quotes before you decide.
More on how this number was built
Every constant behind this page — the 3.11 seasonal COP, the degree-day corrections, the equipment costs — is documented in the methodology guide. At a 17.1°F design temperature, Ridgefield sits in cold-climate territory; the guide to that class of unit explains why.