Monroe, WA: the heat pump payback math

Monroe 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). Monroe'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 — Monroe's numbers don't point clearly either way.

How cold Monroe actually gets

Monroe 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. Below the 25°F line where a standard machine starts leaning on resistance backup, Monroe sits firmly in cold-climate territory, so that's the class of unit priced here. Source: NOAA station SNOHOMISH CO (PAINE FD) AP, 14.1 miles from Monroe — the closest one on record.

What it actually costs to run, year to year

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. That compares with roughly 47 Mcf a year of gas at Monroe's 17.62 per-Mcf rate — about $861 a year — against a local electricity rate of 14.27¢/kWh. Buy it outright, not incrementally, and payback stretches to 42.4 years; over 15 years the net position sits $1,273 ahead.

If your home heats with electric baseboard instead of gas

Gas isn't universal in Monroe — many houses run on electric heat already. Swap the comparison to resistance heat instead of gas, and Monroe's answer improves. The saving here runs about $1,116 a year, which recovers the extra $8,000 spent going electric in roughly 7.2 years.

How Monroe compares nationally

Among 3206 cities, Monroe's winter puts it at rank 1210 for severity, while its size puts it at rank 1931 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 Monroe

Monroe, Washington is home to about 19,927 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 Monroe, nothing is lost by holding off until the current equipment genuinely fails.

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

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. Monroe'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.