Heat Pump Payback in St. George, UT
St. George, UT: the heat pump payback math
St. George technically pencils out, but only past the point the equipment would need replacing anyway. $5,500 is what St. George would pay extra to go electric rather than replace the furnace and AC with the same again. That premium is recovered through $194 of lower running costs every year, landing the payback clock at roughly 28.3 years. That's a technicality, not a recommendation, for anyone actually living in St. George.
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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 low of 17.1°F in the 2024 station record. 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 Airport, 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 including the old AC (electricity here runs 13.12¢/kWh). Buying outright rather than at replacement time stretches payback to longer than the 15-year equipment life. Over 15 years, compared with a like-for-like replacement, the heat pump leaves you $2,585 behind.
What would change St. George's answer
Gas would only overtake the heat pump in St. George if electricity rose past 33.6¢/kWh from 13.12¢, or gas fell under $3.98 per Mcf from $10.19. A useful quote test for St. George: the heat pump is worth it within a decade if it costs less than $1,940 more than replacing the furnace and AC, and within 7 years if the gap is under $1,358.
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 11.4-year payback clears the $10,000 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.