In most York County homes on Duke or York Electric/JEA-style electric rates, a modern air-source heat pump usually costs less to run than a gas furnace during normal South Carolina winter weather.
But there are exceptions.
A gas furnace can still make sense if you already have natural gas, your home needs very hot supply air, or you want strong backup heat during colder snaps.
Why the heat pump often wins on monthly cost
A gas furnace creates heat by burning fuel.
A heat pump moves heat from outside to inside. That is why a properly installed air-source heat pump can deliver two to four times more heat energy than the electricity it uses, according to the U.S. Department of Energy.
That efficiency matters in South Carolina because winters are usually mild enough for a heat pump to stay in its efficient range.
Simple bill comparison
Using rough local electric pricing around 12–13 cents per kWh in York County/Duke territory, heat pumps are often very competitive. EnergySage lists York County electricity around 12¢/kWh as of May 2026, while another utility-rate source shows a Duke Energy Carolinas example around 12.53¢/kWh before riders and seasonal changes.
| System | Usually saves more when… | Watch out for… |
| Air-source heat pump | Winter temps are mild, system is sized correctly, ducts are good | High electric bills if backup heat runs too much |
| Gas furnace | Gas rates are low, house has existing gas, home needs stronger heat output | Gas base charges, venting, combustion safety, separate AC still needed |
| Dual fuel | You want heat pump savings with gas backup | Higher upfront cost and more controls to set correctly |
The big danger: electric backup heat
This is where homeowners sometimes get into trouble.
A heat pump is efficient.
Electric heat strips are not.
If your thermostat is set up poorly, the system is undersized, or someone keeps using “emergency heat,” the electric bill can jump fast. A good technician should check the heat pump balance point, thermostat staging, ductwork, and whether backup heat is coming on too often.
What about natural gas prices?
Gas pricing changes, and some South Carolina gas rates are under active review. Piedmont Natural Gas filed for a South Carolina base rate adjustment in April 2026, with a possible average residential increase if approved later in 2026.
That does not mean gas is bad. It means the comparison should be based on your actual electric bill, gas bill, and equipment efficiency.
Best answer for most homes
For many Rock Hill, Fort Mill, and Tega Cay homes:
Lowest operating cost most of the year: air-source heat pump
Best cold-snap comfort: gas furnace
Best balanced option: dual-fuel heat pump with gas backup
If you only remember one thing, remember this: a heat pump usually saves more in our climate when it is sized and set up correctly, but a bad installation can erase the savings.
