Should Post Falls switch to a heat pump?
Post Falls is a place where a heat pump genuinely costs more to operate than the alternative. 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). Unfortunately the electric bill outweighs the gas bill it replaces by about $250 a year here, so the extra spend stays unrecovered. That's Post Falls's own climate and rates talking, not a hedge or a caveat.
Post Falls's weather, in the numbers that matter
Degree days tell the story here: Post Falls racks up 6151 heating degree days each year (base 65°F), and summers add a moderate cooling load, with 556 cooling degree days on the cooling side. The 99% winter design temperature here — the cold snap equipment must be sized for, not the seasonal average — is -7.6°F, against a record low of -15°F. That puts the seasonal coefficient of performance at 2.52 for the recommended cold-climate unit. Below the 25°F line where a standard machine starts leaning on resistance backup, Post Falls sits firmly in cold-climate territory, so that's the class of unit priced here. These numbers come from COEUR D'ALENE AIR TERM APT, the closest NOAA station, 6.6 miles out.
What it actually costs to run, year to year
A 2000-square-foot house here would pull roughly 6,181 heating kilowatt-hours annually on top of cooling, totalling about $833 a year on electricity. Post Falls's gas rate of 7.69 per Mcf, applied to the 64 Mcf a year the furnace burns, puts its running cost near $583 a year, against 12.52¢ per kWh for electricity. Looked at as a full purchase rather than an incremental one, payback here is longer than the 15-year equipment life, leaving the 15-year total $7,255 behind.
The other scenario: no gas furnace to begin with
Gas isn't universal in Post Falls — many houses run on electric heat already. Swap the comparison to resistance heat instead of gas, and Post Falls's answer improves. About $1,207 a year comes back this way, enough that the 6.6-year payback clears the $8,000 premium comfortably within the equipment's life.
Where Post Falls ranks in this dataset
Among 3206 cities, Post Falls's winter puts it at rank 171 for severity, while its size puts it at rank 895 for population — 1 in both cases being the extreme. That's the coldest third of the dataset, where climate does most of the work behind this figure.
What to do with this number in Post Falls
Post Falls, Idaho is home to about 45,800 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 Post Falls, nothing is lost by holding off until the current equipment genuinely fails.
Line up a few local HVAC quotes before you decide.
Where Post Falls's figure comes from
Nothing above is a black box: the methodology guide shows the full arithmetic behind Post Falls's 2.52 seasonal COP and payback figure. At a -7.6°F design temperature, Post Falls sits in cold-climate territory; the guide to that class of unit explains why.