New Hampshire: 11 cities covered

New Hampshire's cities mostly do not clear a positive payback against a like-for-like gas furnace replacement, which is itself the honest local answer.

• Manchester — 116,386 people, 5422 HDD
• Nashua — 91,851 people, 5681 HDD
• Concord — 44,674 people, 6218 HDD
• Dover — 33,909 people, 6151 HDD
• Rochester — 33,598 people, 5453 HDD
• Keene — 23,036 people, 6260 HDD
• Portsmouth — 22,938 people, 5570 HDD
• Laconia — 17,310 people, 6350 HDD
• Lebanon — 15,389 people, 6437 HDD
• Claremont — 13,105 people, 6303 HDD
• Somersworth — 12,218 people, 5453 HDD