Maryland: 23 cities covered
Across 23 Maryland cities with a positive case for switching, the average incremental payback is about 35.7 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.
- Baltimore — 568,271 people, 2807 HDD
- Frederick — 89,537 people, 3857 HDD
- Gaithersburg — 70,686 people, 3720 HDD
- Rockville — 68,417 people, 3720 HDD
- Bowie — 58,421 people, 4347 HDD
- Hagerstown — 43,909 people, 4057 HDD
- Annapolis — 40,689 people, 3475 HDD
- College Park — 34,667 people, 3720 HDD
- Salisbury — 33,616 people, 3711 HDD
- Laurel — 30,238 people, 4347 HDD
- Greenbelt — 24,843 people, 3720 HDD
- Hyattsville — 21,052 people, 3720 HDD
- Westminster — 20,662 people, 3813 HDD
- Cumberland — 18,643 people, 4397 HDD
- Aberdeen — 18,451 people, 3918 HDD
- Takoma Park — 17,856 people, 3720 HDD
- Easton — 17,381 people, 3704 HDD
- Elkton — 15,977 people, 3872 HDD
- Havre de Grace — 15,222 people, 3872 HDD
- New Carrollton — 13,645 people, 3720 HDD
- Cambridge — 13,262 people, 3250 HDD
- La Plata — 11,374 people, 3611 HDD
- Bel Air — 10,395 people, 3918 HDD