Heat pump vs. gas furnace in Bellevue, WA
In Bellevue, 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 $315 of lower running costs every year, landing the payback clock at roughly 11.1 years. It's a genuine toss-up here — Bellevue's numbers don't point clearly either way.
How cold Bellevue actually gets
Bellevue has a real but manageable winter — 4187 heating degree days a year against a 65°F base — and summers add a moderate cooling load, at 354 cooling degree days. The 99% winter design temperature here — the cold snap equipment must be sized for, not the seasonal average — is 19.9°F, against a record low of 17.1°F. That puts the seasonal coefficient of performance at 3.18 for the recommended cold-climate unit. Bellevue 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. Source: NOAA station RENTON MUNICIPAL AIRPORT, 7.7 miles from Bellevue — the closest one on record.
The month-to-month numbers for Bellevue
Electricity use for heating alone comes out to about 3,334 kWh a year on the 2000-square-foot reference house; folding in cooling puts the electric bill near $519 a year. Bellevue's gas rate of 17.62 per Mcf, applied to the 44 Mcf a year the furnace burns, puts its running cost near $834 a year, against 14.27¢ per kWh for electricity. Buy it outright, not incrementally, and payback stretches to 42.9 years; over 15 years the net position sits $1,225 ahead.
The other scenario: no gas furnace to begin with
Gas isn't universal in Bellevue — many houses run on electric heat already. Swap the comparison to resistance heat instead of gas, and Bellevue's answer improves. About $1,060 a year comes back this way, enough that the 7.6-year payback clears the $8,000 premium comfortably within the equipment's life.
Where Bellevue ranks in this dataset
Bellevue lands at position 1403 out of 3206 cities on heating severity (coldest is 1), and 177 out of 3206 by population size (biggest is 1). That's the middle third for winter severity among the cities covered here.
What to do with this number in Bellevue
Bellevue, Washington is home to about 154,377 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 Bellevue, nothing is lost by holding off until the current equipment genuinely fails.
Line up a few local HVAC quotes before you decide.
More on how this number was built
The methodology guide walks through exactly how Bellevue's 3.18 seasonal COP and the rest of this page's numbers get built. Bellevue's 19.9°F design temperature falls on the cold side of the 25°F cutoff the cold-climate unit guide walks through.