Heat Pump Payback in Tukwila, WA
Will a heat pump pay off in Tukwila, WA?
The payback math works in Tukwila on paper, past the equipment's own working life. $5,500 is what Tukwila would pay extra to go electric rather than replace the furnace and AC with the same again. Lower bills claw that back: about $336 saved annually, for a payback of roughly 16.4 years. Tukwila's own numbers say this pencils out only in theory, not in practice.
Not the city you meant?
Landed on Tukwila by mistake, or want to compare it against somewhere else? Search the other 3206 cities below.
The climate behind Tukwila's payback figure
Degree days tell the story here: Tukwila racks up 4626 heating degree days each year (base 65°F), and summers rarely ask much of an air conditioner, with 260 cooling degree days on the cooling side. 19°F is the figure equipment gets sized against here, the 99th-percentile cold snap, not an average day, with a low of 15.1°F in the 2024 station record. Worked through the model, that's a seasonal COP of 3.16 on the cold-climate unit fit for this climate. Below the 25°F line where a standard machine starts leaning on resistance backup, Tukwila sits firmly in cold-climate territory, so that's the class of unit priced here. These numbers come from Seattle-Tacoma International, the closest NOAA station, 2.9 miles out.
The yearly running costs in Tukwila
Modelled on a typical 2000-square-foot house, the heat pump draws about 3,707 kWh a year to keep it warm, plus cooling, for a combined electric bill near $561 a year. The gas furnace it replaces burns roughly 48 Mcf a year at $17.62 per Mcf here, for a running cost near $897 a year including the old AC (electricity here runs 14.27¢/kWh). If the current system still worked and you replaced it anyway, the full cost would take longer than the 15-year equipment life to earn back; against buying a new furnace and AC regardless, the 15-year total lands $454 behind.
What would change Tukwila's answer
This result holds unless electricity climbs above 23.6¢/kWh (it is 14.27¢ now) or gas drops below $10.64 per Mcf (now $17.62); past either point, gas becomes the cheaper fuel in Tukwila. When quotes arrive, compare the heat pump price with a like-for-like furnace and AC replacement: at $336 a year saved, a difference under $2,352 pays back within 7 years here, and under $3,360 within 10.
The other scenario: no gas furnace to begin with
Not every home in Tukwila has gas service. Swap the comparison to resistance heat instead of gas, and Tukwila's answer improves. Switching saves about $1,159 a year here, a heat pump moving heat rather than generating it needs far less electricity than resistance coils, so the extra $10,000 spent up front comes back in about 8.6 years.
Tukwila against the rest of the country
Tukwila lands at position 1066 out of 3206 cities on heating severity (coldest is 1), and 1808 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.
Deciding what's next in Tukwila, WA
About 21,636 people live in Tukwila, 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.
More on how this number was built
Every constant behind this page, the 3.16 seasonal COP, the degree-day corrections, the equipment costs, is documented in the methodology guide. Tukwila's 19°F design temperature is below the 25°F line, which is why a cold-climate unit is the right call here, see what that changes in the cold-climate unit guide.