Heat Pump Payback in Millington, TN
Heat pump vs. gas furnace in Millington, TN
The payback math works in Millington on paper, past the equipment's own working life. Against a like-for-like gas furnace and AC swap, going electric costs $5,500 more up front here. Millington's residents would see roughly $140 a year back in running costs, putting the payback around 39.2 years. Millington's own numbers say this pencils out only in theory, not in practice.
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The climate behind Millington's payback figure
Degree days tell the story here: Millington racks up 2515 heating degree days each year (base 65°F), and summers are hot enough that cooling matters as much as heating, with 2105 cooling degree days on the cooling side. 10.4°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 2.95 on the cold-climate unit fit for this climate. The average winter here is gentle, but sizing follows the cold snaps, and 10.4°F is below the 25°F point where a standard unit leans on resistance backup, so a cold-climate unit is what gets priced for Millington. Source: NOAA station Millington Municipal Airport, 2.2 miles from Millington, the closest one on record.
Millington's running-cost comparison, in dollars
Modelled on a typical 2000-square-foot house, the heat pump draws about 2,159 kWh a year to keep it warm, plus cooling, for a combined electric bill near $548 a year. Millington's gas rate of $11.84 per Mcf, applied to the 26 Mcf a year the furnace burns, puts the current furnace-and-AC running cost near $689 a year, against 13.87¢ per kWh for electricity. 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 $3,398 behind.
How sensitive Millington's result is to prices
This result holds unless electricity climbs above 25.3¢/kWh (it is 13.87¢ now) or gas drops below $6.49 per Mcf (now $11.84); past either point, gas becomes the cheaper fuel in Millington. When quotes arrive, compare the heat pump price with a like-for-like furnace and AC replacement: at $140 a year saved, a difference under $980 pays back within 7 years here, and under $1,400 within 10.
Electric resistance heat in Millington, compared
Plenty of homes in Millington 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 $713 a year here, a heat pump moving heat rather than generating it needs far less electricity than resistance coils, so the extra $10,000 spent up front comes back in about 14 years.
Millington against the rest of the country
Millington lands at position 2169 out of 3206 cities on heating severity (coldest is 1), and 2901 out of 3206 by population size (biggest is 1). That's the mildest third of cities covered, where utility rates carry more of the answer than climate does.
What to do with this number in Millington
About 11,486 people live in Millington, 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.
Ask a local HVAC contractor for a quote before committing either way.
Reading further on this page's numbers
Every constant behind this page, the 2.95 seasonal COP, the degree-day corrections, the equipment costs, is documented in the methodology guide. Millington's 10.4°F design temperature falls on the cold side of the 25°F cutoff the cold-climate unit guide walks through.