Heat Pump Payback in Sevierville, TN
Should Sevierville switch to a heat pump?
Sevierville technically pencils out, but only past the point the equipment would need replacing anyway. Swap a failed furnace and AC for a heat pump rather than buying like-for-like, and the extra cost here runs $5,500. Sevierville's residents would see roughly $109 a year back in running costs, putting the payback around 50.7 years. That's a technicality, not a recommendation, for anyone actually living in Sevierville.
Checking a different city
This runs the same numbers for 3206 US cities, not just Sevierville. Look one up here.
Sevierville's weather, in the numbers that matter
Degree days tell the story here: Sevierville racks up 3096 heating degree days each year (base 65°F), and summers are hot enough that cooling matters as much as heating, with 1471 cooling degree days on the cooling side. 12.2°F is the figure equipment gets sized against here, the 99th-percentile cold snap, not an average day, with a low of -0.4°F in the 2024 station record. Worked through the model, that's a seasonal COP of 2.99 on the cold-climate unit fit for this climate. A cold-climate unit is the right call in Sevierville, below 25°F design temperature, a standard heat pump leans hard on electric-resistance backup, which erases most of the savings. These numbers come from Knoxville Downtown Island, the closest NOAA station, 17.2 miles out.
Sevierville's running-cost comparison, in dollars
Modelled on a typical 2000-square-foot house, the heat pump draws about 2,622 kWh a year to keep it warm, plus cooling, for a combined electric bill near $538 a year. Sevierville's gas rate of $11.84 per Mcf, applied to the 32 Mcf a year the furnace burns, puts the current furnace-and-AC running cost near $646 a year, against 13.87¢ per kWh for electricity. Priced as a standalone purchase, with a working furnace ripped out early, payback would take longer than the 15-year equipment life. Measured against the like-for-like replacement instead, a household here ends 15 years $3,871 behind.
How sensitive Sevierville's result is to prices
Gas would only overtake the heat pump in Sevierville if electricity rose past 19.4¢/kWh from 13.87¢, or gas fell under $8.47 per Mcf from $11.84. A useful quote test for Sevierville: the heat pump is worth it within a decade if it costs less than $1,090 more than replacing the furnace and AC, and within 7 years if the gap is under $763.
The other scenario: no gas furnace to begin with
Gas isn't universal in Sevierville, 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. The saving here runs about $814 a year, which recovers the extra $10,000 spent going electric in roughly 12.3 years.
How Sevierville compares nationally
Among 3206 cities, Sevierville's winter puts it at rank 1882 for severity, while its size puts it at rank 2070 for population, 1 in both cases being the extreme. That's the middle third for winter severity among the cities covered here.
Deciding what's next in Sevierville, TN
Sevierville, Tennessee is home to about 18,231 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 Sevierville, nothing is lost by holding off until the current equipment genuinely fails.
Ask a local HVAC contractor for a quote before committing either way.
More on how this number was built
Nothing above is a black box: the methodology guide shows the full arithmetic behind Sevierville's 2.99 seasonal COP and payback figure. Sevierville's 12.2°F design temperature falls on the cold side of the 25°F cutoff the cold-climate unit guide walks through.