Iowa: 41 cities covered
Across 41 Iowa cities with a positive case for switching, the average incremental payback is about 74.4 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.
- Des Moines — 213,096 people, 4972 HDD
- Cedar Rapids — 137,904 people, 5468 HDD
- Davenport — 100,938 people, 5207 HDD
- Sioux City — 86,875 people, 5768 HDD
- Ankeny — 76,727 people, 5300 HDD
- Iowa City — 76,710 people, 5066 HDD
- West Des Moines — 73,664 people, 4972 HDD
- Ames — 69,026 people, 5402 HDD
- Waterloo — 67,477 people, 5493 HDD
- Council Bluffs — 62,665 people, 5100 HDD
- Dubuque — 58,987 people, 5726 HDD
- Urbandale — 47,759 people, 4972 HDD
- Marion — 42,542 people, 5468 HDD
- Cedar Falls — 41,417 people, 5493 HDD
- Bettendorf — 40,281 people, 5207 HDD
- Waukee — 34,420 people, 4972 HDD
- Marshalltown — 27,886 people, 5540 HDD
- Mason City — 26,948 people, 6215 HDD
- Ottumwa — 25,648 people, 5177 HDD
- Johnston — 25,022 people, 5300 HDD
- Fort Dodge — 24,886 people, 5810 HDD
- Clinton — 24,118 people, 5388 HDD
- Coralville — 23,959 people, 5066 HDD
- Burlington — 23,637 people, 4871 HDD
- Muscatine — 23,298 people, 5033 HDD
- Altoona — 22,598 people, 5300 HDD
- North Liberty — 21,904 people, 5066 HDD
- Clive — 19,508 people, 4972 HDD
- Grimes — 17,266 people, 5300 HDD
- Indianola — 16,297 people, 4972 HDD
- Newton — 15,709 people, 5368 HDD
- Norwalk — 15,396 people, 4972 HDD
- Boone — 12,461 people, 5583 HDD
- Pleasant Hill — 11,942 people, 5300 HDD
- Storm Lake — 11,627 people, 6078 HDD
- Oskaloosa — 11,575 people, 4497 HDD
- Spencer — 11,418 people, 5958 HDD
- Pella — 10,965 people, 5213 HDD
- Le Mars — 10,674 people, 5485 HDD
- Waverly — 10,576 people, 5493 HDD
- Carroll — 10,125 people, 5721 HDD