South Carolina: 42 cities covered
Across 42 South Carolina cities with a positive case for switching, the average incremental payback is about 11.5 years against a like-for-like gas furnace replacement — but that average hides real spread, which is why each city gets its own page rather than one statewide number.
- Charleston — 157,665 people, 1430 HDD
- Columbia — 144,788 people, 1997 HDD
- North Charleston — 126,005 people, 1497 HDD
- Mount Pleasant — 95,604 people, 1430 HDD
- Rock Hill — 75,798 people, 2789 HDD
- Greenville — 74,371 people, 2435 HDD
- Summerville — 52,625 people, 1792 HDD
- Goose Creek — 50,352 people, 1497 HDD
- Greer — 46,316 people, 2654 HDD
- Sumter — 42,958 people, 2201 HDD
- Florence — 40,923 people, 1979 HDD
- Myrtle Beach — 40,535 people, 1740 HDD
- Spartanburg — 39,606 people, 2098 HDD
- Hilton Head Island — 38,158 people, 1389 HDD
- Fort Mill — 36,244 people, 2789 HDD
- Bluffton — 36,146 people, 1258 HDD
- Aiken — 32,694 people, 2262 HDD
- Anderson — 30,937 people, 2439 HDD
- Mauldin — 29,746 people, 2300 HDD
- Conway — 29,656 people, 2180 HDD
- Simpsonville — 28,078 people, 2300 HDD
- Easley — 27,001 people, 2887 HDD
- North Augusta — 26,395 people, 1770 HDD
- Lexington — 25,354 people, 2070 HDD
- Greenwood — 22,667 people, 2638 HDD
- Hanahan — 21,983 people, 1497 HDD
- North Myrtle Beach — 20,798 people, 1853 HDD
- Clemson — 18,610 people, 2481 HDD
- West Columbia — 18,418 people, 2070 HDD
- Moncks Corner — 18,359 people, 1860 HDD
- Port Royal — 16,507 people, 1556 HDD
- Beaufort — 14,334 people, 1398 HDD
- Tega Cay — 14,294 people, 2789 HDD
- Hardeeville — 13,862 people, 1388 HDD
- Fountain Inn — 13,786 people, 2300 HDD
- Cayce — 13,645 people, 1997 HDD
- Orangeburg — 13,378 people, 1741 HDD
- Gaffney — 12,546 people, 2989 HDD
- James Island — 12,451 people, 1430 HDD
- Irmo — 12,086 people, 1888 HDD
- Newberry — 10,874 people, 2415 HDD
- Forest Acres — 10,438 people, 1997 HDD