Lake Stevens, WA: the heat pump payback math
This one's marginal in Lake Stevens: it only clears if you stay long enough. 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). Lake Stevens's residents would see roughly $318 a year back in running costs, putting the payback around 11 years. It's a genuine toss-up here — Lake Stevens's numbers don't point clearly either way.
Lake Stevens's weather, in the numbers that matter
Lake Stevens has a real but manageable winter — 4489 heating degree days a year against a 65°F base — and summers rarely ask much of an air conditioner, at 200 cooling degree days. 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. Lake Stevens needs the cold-climate class of unit: past a 25°F design temperature a standard heat pump falls back on resistance backup often enough to eat the savings. Climate figures trace to the nearest NOAA station, SNOHOMISH CO (PAINE FD) AP, 10.7 miles from Lake Stevens.
What it actually costs to run, year to year
Electricity use for heating alone comes out to about 3,632 kWh a year on the 2000-square-foot reference house; folding in cooling puts the electric bill near $543 a year. Lake Stevens's gas rate of 17.62 per Mcf, applied to the 47 Mcf a year the furnace burns, puts its running cost near $861 a year, against 14.27¢ per kWh for electricity. Buy it outright, not incrementally, and payback stretches to 42.4 years; over 15 years the net position sits $1,273 ahead.
Electric resistance heat in Lake Stevens, compared
Gas isn't universal in Lake Stevens — many houses run on electric heat already. Against electric-resistance heat — baseboard or an electric furnace, both 100% efficient but still just resistance — the case for switching gets stronger here. The saving here runs about $1,116 a year, which recovers the extra $8,000 spent going electric in roughly 7.2 years.
Where Lake Stevens ranks in this dataset
Among 3206 cities, Lake Stevens's winter puts it at rank 1205 for severity, while its size puts it at rank 990 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 Lake Stevens
Lake Stevens, Washington is home to about 41,350 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 Lake Stevens, nothing is lost by holding off until the current equipment genuinely fails.
Ask a local HVAC contractor for a quote before committing either way.
Where Lake Stevens's figure comes from
Nothing above is a black box: the methodology guide shows the full arithmetic behind Lake Stevens's 3.13 seasonal COP and payback figure. Lake Stevens's 18°F design temperature falls on the cold side of the 25°F cutoff the cold-climate unit guide walks through.