Nashville-Davidson, TN: the heat pump payback math
Nashville-Davidson technically pencils out, but only past the point the equipment would need replacing anyway. Against a like-for-like gas furnace and AC swap, going electric costs $3,500 more up front here (already netting out a $2,000 tax credit). That premium is recovered through $136 of lower running costs every year, landing the payback clock at roughly 25.7 years. Nashville-Davidson's own numbers say this pencils out only in theory, not in practice.
The climate behind Nashville-Davidson's payback figure
Degree days tell the story here: Nashville-Davidson racks up 2807 heating degree days each year (base 65°F), and summers are hot enough that cooling matters as much as heating, with 2098 cooling degree days on the cooling side. Sizing runs off the design temperature, not the average day: 8.6°F here (record low -2.2°F), which works out to a seasonal COP of 2.91 for the cold-climate class of unit this climate calls for. Below the 25°F line where a standard machine starts leaning on resistance backup, Nashville-Davidson sits firmly in cold-climate territory, so that's the class of unit priced here. Climate figures trace to the nearest NOAA station, JOHN C TUNE, 5.7 miles from Nashville-Davidson.
Nashville-Davidson's running-cost comparison, in dollars
A 2000-square-foot house here would pull roughly 2,443 heating kilowatt-hours annually on top of cooling, totalling about $587 a year on electricity. The gas furnace it replaces burns roughly 29 Mcf a year at 11.84 per Mcf here, for a running cost near $723 a year (electricity here runs 13.87¢/kWh). Buy it outright, not incrementally, and payback stretches to 99 years; over 15 years the net position sits $1,454 behind.
Electric resistance heat in Nashville-Davidson, compared
Gas isn't universal in Nashville-Davidson — many houses run on electric heat already. Swap the comparison to resistance heat instead of gas, and Nashville-Davidson's answer improves. About $776 a year comes back this way, enough that the 10.3-year payback clears the $8,000 premium comfortably within the equipment's life.
How Nashville-Davidson compares nationally
Nashville-Davidson lands at position 1989 out of 3206 cities on heating severity (coldest is 1), and 21 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 Nashville-Davidson, TN
About 704,963 people live in Nashville-Davidson, 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.
More on how this number was built
The methodology guide walks through exactly how Nashville-Davidson's 2.91 seasonal COP and the rest of this page's numbers get built. Nashville-Davidson's 8.6°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.