Lake Forest Park, WA: the heat pump payback math
This one's marginal in Lake Forest Park: 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). 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 — Lake Forest Park's numbers don't point clearly either way.
Lake Forest Park's weather, in the numbers that matter
Degree days tell the story here: Lake Forest Park 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. 18°F is the figure equipment gets sized against here — the 99th-percentile cold snap, not an average day — with a record low of 12.9°F on file. Worked through the model, that's a seasonal COP of 3.13 on the cold-climate unit fit for this climate. Below the 25°F line where a standard machine starts leaning on resistance backup, Lake Forest Park sits firmly in cold-climate territory, so that's the class of unit priced here. Climate figures trace to the nearest NOAA station, SNOHOMISH CO (PAINE FD) AP, 10.3 miles from Lake Forest Park.
The month-to-month numbers for Lake Forest Park
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. Lake Forest Park'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. Looked at as a full purchase rather than an incremental one, payback here is roughly 42.4 years, leaving the 15-year total $1,273 ahead.
If your home heats with electric baseboard instead of gas
Not every home in Lake Forest Park 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. The saving here runs about $1,116 a year, which recovers the extra $8,000 spent going electric in roughly 7.2 years.
How Lake Forest Park compares nationally
Ranked against the other 3206 cities covered, Lake Forest Park comes in at 1212 for heating severity — 1 would be the coldest place in the dataset — and 2619 by population, where 1 is largest. That's the middle third for winter severity among the cities covered here.
Next step for 13,276 people in Lake Forest Park
Lake Forest Park, Washington is home to about 13,276 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 Forest Park, nothing is lost by holding off until the current equipment genuinely fails.
Line up a few local HVAC quotes before you decide.
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. Lake Forest Park'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.