Delaware: 6 cities covered
Across 6 Delaware cities with a positive case for switching, the average incremental payback is about 19.4 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.
- Wilmington — 73,176 people, 4086 HDD
- Dover — 40,191 people, 3694 HDD
- Newark — 30,506 people, 4086 HDD
- Middletown — 25,686 people, 3872 HDD
- Milford — 14,079 people, 3765 HDD
- Smyrna — 13,326 people, 3694 HDD