Will a heat pump pay off in Federal Way, WA?
Federal Way sits right on the fence — how long you'll own the house decides this one. 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). That premium is recovered through $252 of lower running costs every year, landing the payback clock at roughly 13.9 years. Whether that's worth it in Federal Way depends on how many years you expect to own the place.
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 (record low 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 month-to-month numbers for 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 its running cost near $653 a year, against 14.27¢ per kWh for electricity. Looked at as a full purchase rather than an incremental one, payback here is roughly 53.6 years, leaving the 15-year total $280 ahead.
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 9.1-year payback clears the $8,000 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.