Heat Pump Payback in Mountlake Terrace, WA
Is a heat pump worth it in Mountlake Terrace?
Mountlake Terrace 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. Mountlake Terrace's residents would see roughly $318 a year back in running costs, putting the payback around 17.3 years. Mountlake Terrace's own numbers say this pencils out only in theory, not in practice.
Compare against another city
Mountlake Terrace is one of 3206 cities covered here, each run through the same model. Search another below.
Why Mountlake Terrace's climate drives this number
Degree days tell the story here: Mountlake Terrace 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 low of 12.9°F in the 2024 station record. Worked through the model, that's a seasonal COP of 3.13 on the cold-climate unit fit for this climate. A cold-climate unit is the right call in Mountlake Terrace, below 25°F design temperature, a standard heat pump leans hard on electric-resistance backup, which erases most of the savings. Source: NOAA station Snohomish Co (Paine Fd) AP, 7.9 miles from Mountlake Terrace, the closest one on record.
The yearly running costs in Mountlake Terrace
A 2000-square-foot house here would pull roughly 3,632 heating kilowatt-hours annually on top of cooling, totalling about $543 a year on electricity. Mountlake Terrace's gas rate of $17.62 per Mcf, applied to the 47 Mcf a year the furnace burns, puts the current furnace-and-AC running cost near $861 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 $727 behind.
The break-even point in Mountlake Terrace
This result holds unless electricity climbs above 23.3¢/kWh (it is 14.27¢ now) or gas drops below $10.81 per Mcf (now $17.62); past either point, gas becomes the cheaper fuel in Mountlake Terrace. When quotes arrive, compare the heat pump price with a like-for-like furnace and AC replacement: at $318 a year saved, a difference under $2,226 pays back within 7 years here, and under $3,180 within 10.
If your home heats with electric baseboard instead of gas
Plenty of homes in Mountlake Terrace heat with electricity alone, no gas line involved. Compared with baseboard or electric-furnace resistance heat, the numbers shift in the heat pump’s favor. About $1,116 a year comes back this way, enough that the 9-year payback clears the $10,000 premium comfortably within the equipment's life.
Mountlake Terrace against the rest of the country
Ranked against the other 3206 cities covered, Mountlake Terrace comes in at 1206 for heating severity, 1 would be the coldest place in the dataset, and 1592 by population, where 1 is largest. That's the middle third for winter severity among the cities covered here.
Next step if you live in Mountlake Terrace
About 25,198 people live in Mountlake Terrace, 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.
Line up a few local HVAC quotes before you decide.
More on how this number was built
Every constant behind this page, the 3.13 seasonal COP, the degree-day corrections, the equipment costs, is documented in the methodology guide. Mountlake Terrace's 18°F design temperature falls on the cold side of the 25°F cutoff the cold-climate unit guide walks through.