Is a heat pump worth it in Twin Falls?
Twin Falls is a place where a heat pump genuinely costs more to operate than the alternative. $3,500 is what Twin Falls 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 $110 a year here, so the extra spend stays unrecovered. That's Twin Falls's own climate and rates talking, not a hedge or a caveat.
Twin Falls's weather, in the numbers that matter
5850 heating degree days pile up here every year, so Twin Falls has a cold winter that leans hard on heating equipment; the cooling side runs to 868 cooling degree days, where summers add a moderate cooling load. Sizing runs off the design temperature, not the average day: 10.9°F here (record low -8°F), which works out to a seasonal COP of 2.96 for the cold-climate class of unit this climate calls for. Twin Falls 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. These numbers come from JSIN FLD-MAGIC VLY RGN APT, the closest NOAA station, 5.8 miles out.
The month-to-month numbers for Twin Falls
Electricity use for heating alone comes out to about 5,004 kWh a year on the 2000-square-foot reference house; folding in cooling puts the electric bill near $719 a year. Twin Falls's gas rate of 7.69 per Mcf, applied to the 61 Mcf a year the furnace burns, puts its running cost near $609 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 $5,148 behind.
If your home heats with electric baseboard instead of gas
Gas isn't universal in Twin Falls — many houses run on electric heat already. Swap the comparison to resistance heat instead of gas, and Twin Falls's answer improves. The saving here runs about $1,276 a year, which recovers the extra $8,000 spent going electric in roughly 6.3 years.
Where Twin Falls ranks in this dataset
Among 3206 cities, Twin Falls's winter puts it at rank 274 for severity, while its size puts it at rank 738 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 Twin Falls
Twin Falls, Idaho is home to about 55,589 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 Twin Falls, nothing is lost by holding off until the current equipment genuinely fails.
Get quotes from local HVAC contractors before deciding.
Reading further on this page's numbers
Nothing above is a black box: the methodology guide shows the full arithmetic behind Twin Falls's 2.96 seasonal COP and payback figure. Twin Falls's 10.9°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.