Will a heat pump pay off in Bothell, WA?

In Bothell, the math is close enough that it comes down to how long you plan to stay. Swap a failed furnace and AC for a heat pump rather than buying like-for-like, and the extra cost here runs $3,500 after a $2,000 federal tax credit. That premium is recovered through $318 of lower running costs every year, landing the payback clock at roughly 11 years. It's a genuine toss-up here — Bothell's numbers don't point clearly either way.

How cold Bothell actually gets

Degree days tell the story here: Bothell racks up 4489 heating degree days each year (base 65°F), and summers rarely ask much of an air conditioner, with 200 cooling degree days on the cooling side. Sizing runs off the design temperature, not the average day: 18°F here (record low 12.9°F), which works out to a seasonal COP of 3.13 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, Bothell sits firmly in cold-climate territory, so that's the class of unit priced here. Source: NOAA station SNOHOMISH CO (PAINE FD) AP, 9.9 miles from Bothell — the closest one on record.

The month-to-month numbers for Bothell

Modelled on a typical 2000-square-foot house, the heat pump draws about 3,632 kWh a year to keep it warm, plus cooling, for a combined electric bill near $543 a year. The gas furnace it replaces burns roughly 47 Mcf a year at 17.62 per Mcf here, for a running cost near $861 a year (electricity here runs 14.27¢/kWh). Priced as a standalone purchase rather than against a like-for-like replacement, equipment payback runs about 42.4 years, for a 15-year net position $1,273 ahead.

Electric resistance heat in Bothell, compared

Not every home in Bothell 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 $1,116 a year comes back this way, enough that the 7.2-year payback clears the $8,000 premium comfortably within the equipment's life.

Bothell against the rest of the country

Among 3206 cities, Bothell's winter puts it at rank 1202 for severity, while its size puts it at rank 787 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 Bothell

Bothell, Washington is home to about 51,770 people, and the figures above are the same ones a local HVAC contractor uses to size and quote a system — this site doesn't guess where a real quote would land, it just tells you whether it's worth asking for one. In Bothell, nothing is lost by holding off until the current equipment genuinely fails.

Ask a local HVAC contractor for a quote before committing either way.

Reading further on this page's numbers

Every constant behind this page — the 3.13 seasonal COP, the degree-day corrections, the equipment costs — is documented in the methodology guide. Bothell's 18°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.