Heat Pump Payback in Rock Hill, SC
Heat pump vs. gas furnace in Rock Hill, SC
Rock 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 $5,500 more up front here. Rock Hill's residents would see roughly $230 a year back in running costs, putting the payback around 23.9 years. Rock Hill's own numbers say this pencils out only in theory, not in practice.
Compare against another city
This runs the same numbers for 3206 US cities, not just Rock Hill. Look one up here.
Why Rock Hill's climate drives this number
Rock Hill has a mild winter by US standards, 2789 heating degree days a year against a 65°F base, and summers are hot enough that cooling matters as much as heating, at 1564 cooling degree days. 15.1°F is the figure equipment gets sized against here, the 99th-percentile cold snap, not an average day, with a low of 10.9°F in the 2024 station record. Worked through the model, that's a seasonal COP of 3.06 on the cold-climate unit fit for this climate. The average winter here is gentle, but sizing follows the cold snaps, and 15.1°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 Rock Hill. Source: NOAA station Rk Hl/York Co/Brynt Fd Apt, 4 miles from Rock Hill, the closest one on record.
What it actually costs to run, year to year
Electricity use for heating alone comes out to about 2,308 kWh a year on the 2000-square-foot reference house; folding in cooling puts the electric bill near $588 a year. Rock Hill's gas rate of $16.91 per Mcf, applied to the 29 Mcf a year the furnace burns, puts the current furnace-and-AC running cost near $819 a year, against 16.16¢ per kWh for electricity. If the current system still worked and you replaced it anyway, the full cost would take longer than the 15-year equipment life to earn back; against buying a new furnace and AC regardless, the 15-year total lands $2,046 behind.
How sensitive Rock Hill's result is to prices
This result holds unless electricity climbs above 30.4¢/kWh (it is 16.16¢ now) or gas drops below $8.98 per Mcf (now $16.91); past either point, gas becomes the cheaper fuel in Rock Hill. When quotes arrive, compare the heat pump price with a like-for-like furnace and AC replacement: at $230 a year saved, a difference under $1,610 pays back within 7 years here, and under $2,300 within 10.
If your home heats with electric baseboard instead of gas
Gas isn't universal in Rock Hill, many houses run on electric heat already. Compared with baseboard or electric-furnace resistance heat, the numbers shift in the heat pump’s favor. The saving here runs about $880 a year, which recovers the extra $10,000 spent going electric in roughly 11.4 years.
Where Rock Hill ranks in this dataset
Rock Hill lands at position 2003 out of 3206 cities on heating severity (coldest is 1), and 504 out of 3206 by population size (biggest is 1). That's the middle third for winter severity among the cities covered here.
What to do with this number in Rock Hill
About 75,798 people live in Rock Hill, 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.
Get quotes from local HVAC contractors before deciding.
Reading further on this page's numbers
The methodology guide walks through exactly how Rock Hill's 3.06 seasonal COP and the rest of this page's numbers get built. Rock Hill's 15.1°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.