Heat Pump Payback in Yelm, WA
Is a heat pump worth it in Yelm?
The payback math works in Yelm on paper, past the equipment's own working life. Swap a failed furnace and AC for a heat pump rather than buying like-for-like, and the extra cost here runs $5,500. Lower bills claw that back: about $332 saved annually, for a payback of roughly 16.6 years. Yelm's own numbers say this pencils out only in theory, not in practice.
Not the city you meant?
Yelm is one of 3206 cities covered here, each run through the same model. Search another below.
The climate behind Yelm's payback figure
Yelm has a real but manageable winter, 4752 heating degree days a year against a 65°F base, and summers rarely ask much of an air conditioner, at 273 cooling degree days. The 99% winter design temperature here, the cold snap equipment must be sized for, not the seasonal average, is 16°F, and the coldest daily reading in the 2024 station record was 11.5°F. That puts the seasonal coefficient of performance at 3.08 for the recommended cold-climate unit. Below the 25°F line where a standard machine starts leaning on resistance backup, Yelm sits firmly in cold-climate territory, so that's the class of unit priced here. Climate figures trace to the nearest NOAA station, Gray Aff Airport, 10.1 miles from Yelm.
The yearly running costs in Yelm
Electricity use for heating alone comes out to about 3,907 kWh a year on the 2000-square-foot reference house; folding in cooling puts the electric bill near $591 a year. That compares with roughly 49 Mcf a year of gas at Yelm's $17.62 per-Mcf rate, about $923 a year with the old AC included, against a local electricity rate of 14.27¢/kWh. Buying outright rather than at replacement time stretches payback to longer than the 15-year equipment life. Over 15 years, compared with a like-for-like replacement, the heat pump leaves you $523 behind.
What would change Yelm's answer
This result holds unless electricity climbs above 23.0¢/kWh (it is 14.27¢ now) or gas drops below $10.92 per Mcf (now $17.62); past either point, gas becomes the cheaper fuel in Yelm. When quotes arrive, compare the heat pump price with a like-for-like furnace and AC replacement: at $332 a year saved, a difference under $2,324 pays back within 7 years here, and under $3,320 within 10.
Electric resistance heat in Yelm, compared
Plenty of homes in Yelm heat with electricity alone, no gas line involved. Against electric-resistance heat, baseboard or an electric furnace, both 100% efficient but still just resistance, the case for switching gets stronger here. About $1,177 a year comes back this way, enough that the 8.5-year payback clears the $10,000 premium comfortably within the equipment's life.
Where Yelm ranks in this dataset
Yelm lands at position 994 out of 3206 cities on heating severity (coldest is 1), and 2860 out of 3206 by population size (biggest is 1). That's the coldest third of the dataset, where climate does most of the work behind this figure.
Next step if you live in Yelm
About 11,715 people live in Yelm, 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.
Get quotes from local HVAC contractors before deciding.
Where Yelm's figure comes from
Nothing above is a black box: the methodology guide shows the full arithmetic behind Yelm's 3.08 seasonal COP and payback figure. Yelm's 16°F design temperature falls on the cold side of the 25°F cutoff the cold-climate unit guide walks through.