Heat pump vs. gas furnace in Sumter, SC
Sumter sits right on the fence — how long you'll own the house decides this one. $3,500 is what Sumter 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 $246 of lower running costs every year, landing the payback clock at roughly 14.2 years. It's a genuine toss-up here — Sumter's numbers don't point clearly either way.
How cold Sumter actually gets
Sumter has a mild winter by US standards — 2201 heating degree days a year against a 65°F base — and summers are hot enough that cooling matters as much as heating, at 1987 cooling degree days. Sizing runs off the design temperature, not the average day: 19.4°F here (record low 14°F), which works out to a seasonal COP of 3.17 for the cold-climate class of unit this climate calls for. Sumter needs the cold-climate class of unit: past a 25°F design temperature a standard heat pump falls back on resistance backup often enough to eat the savings. Source: NOAA station SUMTER AIRPORT, 4.4 miles from Sumter — the closest one on record.
Sumter's running-cost comparison, in dollars
Electricity use for heating alone comes out to about 1,758 kWh a year on the 2000-square-foot reference house; folding in cooling puts the electric bill near $558 a year. That compares with roughly 23 Mcf a year of gas at Sumter's 16.91 per-Mcf rate — about $804 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 54.9 years, leaving the 15-year total $188 ahead.
If your home heats with electric baseboard instead of gas
Plenty of homes in Sumter heat with electricity alone, no gas line involved. Against electric-resistance heat — baseboard or an electric furnace, both 100% efficient but still just resistance — the case for switching gets stronger here. Switching saves about $759 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 10.5 years.
Sumter against the rest of the country
Among 3206 cities, Sumter's winter puts it at rank 2323 for severity, while its size puts it at rank 957 for population — 1 in both cases being the extreme. That's the mildest third of cities covered, where utility rates carry more of the answer than climate does.
Deciding what's next in Sumter, SC
Sumter, South Carolina is home to about 42,958 people, and the figures above are the same ones a local HVAC contractor uses to size and quote a system — this site doesn't guess where a real quote would land, it just tells you whether it's worth asking for one. In Sumter, nothing is lost by holding off until the current equipment genuinely fails.
Get quotes from local HVAC contractors before deciding.
Where Sumter's figure comes from
Every constant behind this page — the 3.17 seasonal COP, the degree-day corrections, the equipment costs — is documented in the methodology guide. At a 19.4°F design temperature, Sumter sits in cold-climate territory; the guide to that class of unit explains why.