Should Spring Hill switch to a heat pump?
Spring Hill 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). Lower bills claw that back: about $95 saved annually, for a payback of roughly 36.6 years. Spring Hill's own numbers say this pencils out only in theory, not in practice.
Why Spring Hill's climate drives this number
Spring Hill has a real but manageable winter — 3098 heating degree days a year against a 65°F base — and summers are hot enough that cooling matters as much as heating, at 1615 cooling degree days. The 99% winter design temperature here — the cold snap equipment must be sized for, not the seasonal average — is 5°F, against a record low of -13°F. That puts the seasonal coefficient of performance at 2.82 for the recommended cold-climate unit. Below the 25°F line where a standard machine starts leaning on resistance backup, Spring Hill sits firmly in cold-climate territory, so that's the class of unit priced here. Source: NOAA station ELLINGTON, 17.7 miles from Spring Hill — 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 2,782 kWh a year to keep it warm, plus cooling, for a combined electric bill near $577 a year. Spring Hill's gas rate of 11.84 per Mcf, applied to the 32 Mcf a year the furnace burns, puts its running cost near $672 a year, against 13.87¢ per kWh for electricity. Buy it outright, not incrementally, and payback stretches to 141.4 years; over 15 years the net position sits $2,068 behind.
Electric resistance heat in Spring Hill, compared
Plenty of homes in Spring Hill heat with electricity alone, no gas line involved. Compared with baseboard or electric-furnace resistance heat, the numbers shift in the heat pump’s favor. The saving here runs about $802 a year, which recovers the extra $8,000 spent going electric in roughly 10 years.
Spring Hill against the rest of the country
Spring Hill lands at position 1877 out of 3206 cities on heating severity (coldest is 1), and 680 out of 3206 by population size (biggest is 1). That's the middle third for winter severity among the cities covered here.
Next step for 59,398 people in Spring Hill
About 59,398 people live in Spring Hill, 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 2.82 seasonal COP, the degree-day corrections, the equipment costs — is documented in the methodology guide. At a 5°F design temperature, Spring Hill sits in cold-climate territory; the guide to that class of unit explains why.