Bristol, TN: the heat pump payback math
The payback math works in Bristol on paper, past the equipment's own working life. $3,500 is what Bristol 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. Bristol's residents would see roughly $91 a year back in running costs, putting the payback around 38.4 years. Bristol's own numbers say this pencils out only in theory, not in practice.
Why Bristol's climate drives this number
3585 heating degree days pile up here every year, so Bristol has a real but manageable winter; the cooling side runs to 1209 cooling degree days, where summers are hot enough that cooling matters as much as heating. 10.9°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 2.96 on the cold-climate unit fit for this climate. Below the 25°F line where a standard machine starts leaning on resistance backup, Bristol sits firmly in cold-climate territory, so that's the class of unit priced here. Source: NOAA station TRI-CITIES REGIONAL TN/VA AIR, 11.5 miles from Bristol — the closest one on record.
What it actually costs to run, year to year
Modelled on a typical 2000-square-foot house, the heat pump draws about 3,067 kWh a year to keep it warm, plus cooling, for a combined electric bill near $568 a year. The gas furnace it replaces burns roughly 37 Mcf a year at 11.84 per Mcf here, for a running cost near $659 a year (electricity here runs 13.87¢/kWh). Priced as a standalone purchase rather than against a like-for-like replacement, equipment payback runs about 148.3 years, for a 15-year net position $2,134 behind.
If your home heats with electric baseboard instead of gas
Plenty of homes in Bristol heat with electricity alone, no gas line involved. Against electric-resistance heat — baseboard or an electric furnace, both 100% efficient but still just resistance — the case for switching gets stronger here. Switching saves about $908 a year here — a heat pump moving heat rather than generating it needs far less electricity than resistance coils — so the extra $8,000 spent up front comes back in about 8.8 years.
Where Bristol ranks in this dataset
Bristol lands at position 1748 out of 3206 cities on heating severity (coldest is 1), and 1438 out of 3206 by population size (biggest is 1). That's the middle third for winter severity among the cities covered here.
What to do with this number in Bristol
About 27,867 people live in Bristol, Tennessee, 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.
Get quotes from local HVAC contractors before deciding.
Reading further on this page's numbers
The methodology guide walks through exactly how Bristol's 2.96 seasonal COP and the rest of this page's numbers get built. Bristol'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.