Heat Pump Payback in Hanahan, SC
Hanahan, SC: the heat pump payback math
Hanahan technically pencils out, but only past the point the equipment would need replacing anyway. $5,500 is what Hanahan would pay extra to go electric rather than replace the furnace and AC with the same again. Lower bills claw that back: about $258 saved annually, for a payback of roughly 21.3 years. Hanahan's own numbers say this pencils out only in theory, not in practice.
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The climate behind Hanahan's payback figure
Degree days tell the story here: Hanahan racks up 1497 heating degree days each year (base 65°F), and summers are severe enough that cooling can dominate the annual bill, with 2554 cooling degree days on the cooling side. Sizing runs off the design temperature, not the average day: 23°F here (coldest 2024 reading 21.9°F), which works out to a seasonal COP of 3.25 for the cold-climate class of unit this climate calls for. The average winter here is gentle, but sizing follows the cold snaps, and 23°F is below the 25°F point where a standard unit leans on resistance backup, so a cold-climate unit is what gets priced for Hanahan. Source: NOAA station Charleston Afb/International, 3.2 miles from Hanahan, 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 1,166 kWh a year to keep it warm, plus cooling, for a combined electric bill near $540 a year. That compares with roughly 16 Mcf a year of gas at Hanahan's $16.91 per-Mcf rate, about $799 a year with the old AC included, against a local electricity rate of 16.16¢/kWh. Priced as a standalone purchase, with a working furnace ripped out early, payback would take longer than the 15-year equipment life. Measured against the like-for-like replacement instead, a household here ends 15 years $1,628 behind.
The break-even point in Hanahan
This result holds unless electricity climbs above 775.9¢/kWh (it is 16.16¢ now) or gas drops below $0.35 per Mcf (now $16.91); past either point, gas becomes the cheaper fuel in Hanahan. When quotes arrive, compare the heat pump price with a like-for-like furnace and AC replacement: at $258 a year saved, a difference under $1,806 pays back within 7 years here, and under $2,580 within 10.
Electric resistance heat in Hanahan, compared
Plenty of homes in Hanahan heat with electricity alone, no gas line involved. Swap the comparison to resistance heat instead of gas, and Hanahan's answer improves. Even against resistance heat, the running-cost gap here isn't enough to clear the $10,000 incremental cost within the equipment's 15-year life.
How Hanahan compares nationally
Hanahan lands at position 2695 out of 3206 cities on heating severity (coldest is 1), and 1784 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 Hanahan
About 21,983 people live in Hanahan, 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.
More on how this number was built
Nothing above is a black box: the methodology guide shows the full arithmetic behind Hanahan's 3.25 seasonal COP and payback figure. At a 23°F design temperature, Hanahan sits in cold-climate territory; the guide to that class of unit explains why.