Heat Pump Payback in Federal Way, WA
Will a heat pump pay off in Federal Way, WA?
Federal Way technically pencils out, but only past the point the equipment would need replacing anyway. Against a like-for-like gas furnace and AC swap, going electric costs $5,500 more up front here. That premium is recovered through $252 of lower running costs every year, landing the payback clock at roughly 21.8 years. Federal Way's own numbers say this pencils out only in theory, not in practice.
Compare against another city
This runs the same numbers for 3206 US cities, not just Federal Way. Look one up here.
The climate behind Federal Way's payback figure
Federal Way has a real but manageable winter, 3501 heating degree days a year against a 65°F base, and summers rarely ask much of an air conditioner, at 58 cooling degree days. Sizing runs off the design temperature, not the average day: 21.2°F here (coldest 2024 reading 16.7°F), which works out to a seasonal COP of 3.21 for the cold-climate class of unit this climate calls for. Below the 25°F line where a standard machine starts leaning on resistance backup, Federal Way sits firmly in cold-climate territory, so that's the class of unit priced here. These numbers come from Tacoma Met, the closest NOAA station, 4.5 miles out.
The yearly running costs in Federal Way
A 2000-square-foot house here would pull roughly 2,762 heating kilowatt-hours annually on top of cooling, totalling about $401 a year on electricity. Federal Way's gas rate of $17.62 per Mcf, applied to the 36 Mcf a year the furnace burns, puts the current furnace-and-AC running cost near $653 a year, against 14.27¢ per kWh for electricity. 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 $1,720 behind.
What would change Federal Way's answer
This result holds unless electricity climbs above 23.5¢/kWh (it is 14.27¢ now) or gas drops below $10.71 per Mcf (now $17.62); past either point, gas becomes the cheaper fuel in Federal Way. When quotes arrive, compare the heat pump price with a like-for-like furnace and AC replacement: at $252 a year saved, a difference under $1,764 pays back within 7 years here, and under $2,520 within 10.
If your home heats with electric baseboard instead of gas
Not every home in Federal Way has gas service. Against electric-resistance heat, baseboard or an electric furnace, both 100% efficient but still just resistance, the case for switching gets stronger here. About $875 a year comes back this way, enough that the 11.4-year payback clears the $10,000 premium comfortably within the equipment's life.
Federal Way against the rest of the country
Among 3206 cities, Federal Way's winter puts it at rank 1770 for severity, while its size puts it at rank 339 for population, 1 in both cases being the extreme. That's the middle third for winter severity among the cities covered here.
What to do with this number in Federal Way
About 100,252 people live in Federal Way, 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.
Reading further on this page's numbers
Every constant behind this page, the 3.21 seasonal COP, the degree-day corrections, the equipment costs, is documented in the methodology guide. Federal Way's 21.2°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.