Is a heat pump worth it in Greenville?

This one's marginal in Greenville: it only clears if you stay long enough. $3,500 is what Greenville would pay extra to go electric rather than replace the furnace and AC with the same again, once the $2,000 federal credit is applied. That premium is recovered through $271 of lower running costs every year, landing the payback clock at roughly 12.9 years. Whether that's worth it in Greenville depends on how many years you expect to own the place.

The climate behind Greenville's payback figure

Degree days tell the story here: Greenville racks up 1966 heating degree days each year (base 65°F), and summers are severe enough that cooling can dominate the annual bill, with 2599 cooling degree days on the cooling side. Sizing runs off the design temperature, not the average day: 17.1°F here (record low 8.1°F), which works out to a seasonal COP of 3.11 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, Greenville sits firmly in cold-climate territory, so that's the class of unit priced here. Climate figures trace to the nearest NOAA station, MID DELTA REGIONAL AIRPORT, 7.9 miles from Greenville.

What it actually costs to run, year to year

Electricity use for heating alone comes out to about 1,601 kWh a year on the 2000-square-foot reference house; folding in cooling puts the electric bill near $590 a year. Greenville's gas rate of 16.64 per Mcf, applied to the 20 Mcf a year the furnace burns, puts its running cost near $862 a year, against 15.47¢ per kWh for electricity. Priced as a standalone purchase rather than against a like-for-like replacement, equipment payback runs about 49.8 years, for a 15-year net position $570 ahead.

Electric resistance heat in Greenville, compared

Gas isn't universal in Greenville — 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 $701 a year, which recovers the extra $8,000 spent going electric in roughly 11.4 years.

Greenville against the rest of the country

Greenville lands at position 2437 out of 3206 cities on heating severity (coldest is 1), and 1475 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 Greenville

About 27,015 people live in Greenville, Mississippi, 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.

Line up a few local HVAC quotes before you decide.

Where Greenville's figure comes from

Nothing above is a black box: the methodology guide shows the full arithmetic behind Greenville's 3.11 seasonal COP and payback figure. At a 17.1°F design temperature, Greenville sits in cold-climate territory; the guide to that class of unit explains why.