Heat pump vs. gas furnace in Moncks Corner, SC
This one's marginal in Moncks Corner: it only clears if you stay long enough. $3,500 is what Moncks Corner 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. Lower bills claw that back: about $241 saved annually, for a payback of roughly 14.5 years. Whether that's worth it in Moncks Corner depends on how many years you expect to own the place.
The climate behind Moncks Corner's payback figure
Degree days tell the story here: Moncks Corner racks up 1860 heating degree days each year (base 65°F), and summers are hot enough that cooling matters as much as heating, with 2005 cooling degree days on the cooling side. 24.8°F is the figure equipment gets sized against here — the 99th-percentile cold snap, not an average day — with a record low of 23°F on file. Worked through the model, that's a seasonal COP of 3.3 on the cold-climate unit fit for this climate. Below the 25°F line where a standard machine starts leaning on resistance backup, Moncks Corner sits firmly in cold-climate territory, so that's the class of unit priced here. Source: NOAA station BERKELEY COUNTY AIRPORT, 2.9 miles from Moncks Corner — the closest one on record.
What it actually costs to run, year to year
A 2000-square-foot house here would pull roughly 1,427 heating kilowatt-hours annually on top of cooling, totalling about $507 a year on electricity. That compares with roughly 19 Mcf a year of gas at Moncks Corner's 16.91 per-Mcf rate — about $747 a year — against a local electricity rate of 16.16¢/kWh. Looked at as a full purchase rather than an incremental one, payback here is roughly 56.1 years, leaving the 15-year total $109 ahead.
The other scenario: no gas furnace to begin with
Plenty of homes in Moncks Corner 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. Switching saves about $674 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 11.9 years.
Moncks Corner against the rest of the country
Moncks Corner lands at position 2503 out of 3206 cities on heating severity (coldest is 1), and 2062 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.
Deciding what's next in Moncks Corner, SC
About 18,359 people live in Moncks Corner, South Carolina, 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
The methodology guide walks through exactly how Moncks Corner's 3.3 seasonal COP and the rest of this page's numbers get built. Moncks Corner's 24.8°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.