Sandpoint, ID: the heat pump payback math
Here in Sandpoint, the honest answer is that a heat pump raises your annual running cost. $3,500 is what Sandpoint would pay extra to go electric rather than replace the furnace and AC with the same again, once the $2,000 federal credit is applied. Unfortunately the electric bill outweighs the gas bill it replaces by about $286 a year here, so the extra spend stays unrecovered. There's no spin on that: Sandpoint's numbers say wait.
The climate behind Sandpoint's payback figure
Sandpoint has a cold winter that leans hard on heating equipment — 6899 heating degree days a year against a 65°F base — and summers rarely ask much of an air conditioner, at 285 cooling degree days. -5.8°F is the figure equipment gets sized against here — the 99th-percentile cold snap, not an average day — with a record low of -16.6°F on file. Worked through the model, that's a seasonal COP of 2.56 on the cold-climate unit fit for this climate. A cold-climate unit is the right call in Sandpoint — below 25°F design temperature, a standard heat pump leans hard on electric-resistance backup, which erases most of the savings. Climate figures trace to the nearest NOAA station, SANDPOINT AIRPORT, 1.2 miles from Sandpoint.
What it actually costs to run, year to year
A 2000-square-foot house here would pull roughly 6,824 heating kilowatt-hours annually on top of cooling, totalling about $885 a year on electricity. That compares with roughly 72 Mcf a year of gas at Sandpoint's 7.69 per-Mcf rate — about $599 a year — against a local electricity rate of 12.52¢/kWh. Priced as a standalone purchase rather than against a like-for-like replacement, equipment payback runs past the 15-year equipment life, for a 15-year net position $7,790 behind.
If your home heats with electric baseboard instead of gas
Plenty of homes in Sandpoint heat with electricity alone, no gas line involved. Swap the comparison to resistance heat instead of gas, and Sandpoint's answer improves. About $1,349 a year comes back this way, enough that the 5.9-year payback clears the $8,000 premium comfortably within the equipment's life.
Sandpoint against the rest of the country
Sandpoint lands at position 52 out of 3206 cities on heating severity (coldest is 1), and 3098 out of 3206 by population size (biggest is 1). That's the coldest third of the dataset, where climate does most of the work behind this figure.
Next step for 10,444 people in Sandpoint
About 10,444 people live in Sandpoint, Idaho, 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.
Where Sandpoint's figure comes from
The methodology guide walks through exactly how Sandpoint's 2.56 seasonal COP and the rest of this page's numbers get built. Sandpoint's -5.8°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.