Should Goodlettsville switch to a heat pump?
In Goodlettsville, the extra upfront cost technically comes back, just not before the equipment wears out. 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). Lower bills claw that back: about $136 saved annually, for a payback of roughly 25.7 years. Goodlettsville's own numbers say this pencils out only in theory, not in practice.
Why Goodlettsville's climate drives this number
2807 heating degree days pile up here every year, so Goodlettsville has a mild winter by US standards; the cooling side runs to 2098 cooling degree days, where summers are hot enough that cooling matters as much as heating. 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. A cold-climate unit is the right call in Goodlettsville — 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 JOHN C TUNE, the closest NOAA station, 14.6 miles out.
What it actually costs to run, year to year
Modelled on a typical 2000-square-foot house, the heat pump draws about 2,443 kWh a year to keep it warm, plus cooling, for a combined electric bill near $587 a year. 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). Looked at as a full purchase rather than an incremental one, payback here is roughly 99 years, leaving the 15-year total $1,454 behind.
If your home heats with electric baseboard instead of gas
Gas isn't universal in Goodlettsville — many houses run on electric heat already. Compared with baseboard or electric-furnace resistance heat, the numbers shift in the heat pump’s favor. Switching saves about $776 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 10.3 years.
Where Goodlettsville ranks in this dataset
Ranked against the other 3206 cities covered, Goodlettsville comes in at 1992 for heating severity — 1 would be the coldest place in the dataset — and 2146 by population, where 1 is largest. That's the middle third for winter severity among the cities covered here.
What to do with this number in Goodlettsville
About 17,433 people live in Goodlettsville, 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.
Where Goodlettsville's figure comes from
Every constant behind this page — the 2.91 seasonal COP, the degree-day corrections, the equipment costs — is documented in the methodology guide. Goodlettsville'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.