St. George, UT: the heat pump payback math
St. George technically pencils out, but only past the point the equipment would need replacing anyway. $3,500 is what St. George 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. That premium is recovered through $194 of lower running costs every year, landing the payback clock at roughly 18 years. That's a technicality, not a recommendation, for anyone actually living in St. George.
St. George's weather, in the numbers that matter
St. George has a real but manageable winter — 3006 heating degree days a year against a 65°F base — and summers are severe enough that cooling can dominate the annual bill, at 3290 cooling degree days. 19°F is the figure equipment gets sized against here — the 99th-percentile cold snap, not an average day — with a record low of 17.1°F on file. Worked through the model, that's a seasonal COP of 3.16 on the cold-climate unit fit for this climate. St. George 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. Climate figures trace to the nearest NOAA station, ST GEORGE MUNICIPAL ARPT, 2 miles from St. George.
St. George's running-cost comparison, in dollars
Modelled on a typical 2000-square-foot house, the heat pump draws about 2,409 kWh a year to keep it warm, plus cooling, for a combined electric bill near $684 a year. The gas furnace it replaces burns roughly 31 Mcf a year at 10.19 per Mcf here, for a running cost near $878 a year (electricity here runs 13.12¢/kWh). Buy it outright, not incrementally, and payback stretches to 69.5 years; over 15 years the net position sits $585 behind.
If your home heats with electric baseboard instead of gas
Gas isn't universal in St. George — many houses run on electric heat already. Against electric-resistance heat — baseboard or an electric furnace, both 100% efficient but still just resistance — the case for switching gets stronger here. About $874 a year comes back this way, enough that the 9.2-year payback clears the $8,000 premium comfortably within the equipment's life.
How St. George compares nationally
St. George lands at position 1924 out of 3206 cities on heating severity (coldest is 1), and 309 out of 3206 by population size (biggest is 1). That's the middle third for winter severity among the cities covered here.
Deciding what's next in St. George, UT
St. George, Utah is home to about 106,288 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 St. George, nothing is lost by holding off until the current equipment genuinely fails.
Get quotes from local HVAC contractors before deciding.
More on how this number was built
Nothing above is a black box: the methodology guide shows the full arithmetic behind St. George's 3.16 seasonal COP and payback figure. At a 19°F design temperature, St. George sits in cold-climate territory; the guide to that class of unit explains why.