Is a heat pump worth it in Garden City?
In Garden City, a heat pump would cost more to run each year than what you have now. 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. The heat pump would cost about $72 more a year to run than the furnace it replaces — a premium with no payback. That's Garden City's own climate and rates talking, not a hedge or a caveat.
Garden City's weather, in the numbers that matter
4976 heating degree days pile up here every year, so Garden City has a real but manageable winter; the cooling side runs to 1428 cooling degree days, where summers are hot enough that cooling matters as much as heating. 7°F is the figure equipment gets sized against here — the 99th-percentile cold snap, not an average day — with a record low of 3°F on file. Worked through the model, that's a seasonal COP of 2.87 on the cold-climate unit fit for this climate. Garden City 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 BOISE AIR TERMINAL/GOWEN FD A, the closest NOAA station, 7.5 miles out.
Garden City's running-cost comparison, in dollars
Modelled on a typical 2000-square-foot house, the heat pump draws about 4,390 kWh a year to keep it warm, plus cooling, for a combined electric bill near $702 a year. The gas furnace it replaces burns roughly 52 Mcf a year at 7.69 per Mcf here, for a running cost near $630 a year (electricity here runs 12.52¢/kWh). Buy it outright, not incrementally, and payback stretches to beyond the 15-year equipment life; over 15 years the net position sits $4,578 behind.
The other scenario: no gas furnace to begin with
Plenty of homes in Garden City heat with electricity alone, no gas line involved. Compared with baseboard or electric-furnace resistance heat, the numbers shift in the heat pump’s favor. About $1,107 a year comes back this way, enough that the 7.2-year payback clears the $8,000 premium comfortably within the equipment's life.
How Garden City compares nationally
Ranked against the other 3206 cities covered, Garden City comes in at 740 for heating severity — 1 would be the coldest place in the dataset — and 2661 by population, where 1 is largest. That's the coldest third of the dataset, where climate does most of the work behind this figure.
Next step for 12,936 people in Garden City
Garden City, Idaho is home to about 12,936 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 Garden City, nothing is lost by holding off until the current equipment genuinely fails.
Ask a local HVAC contractor for a quote before committing either way.
Reading further on this page's numbers
The methodology guide walks through exactly how Garden City's 2.87 seasonal COP and the rest of this page's numbers get built. Garden City's 7°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.