From the inspection file
The 12 metros with the most heating degree days
Twelve large US metros ordered by annual heating degree days, base 65F, from NOAA's 1991-2020 climate normals: the places that work a furnace hardest.
InspectedOctober 17, 2026figures as pulled
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The System Lifespan Index ranked 12 noaa degree days in metro, sorted by hdd. Every number below comes straight from the source data, not an estimate.
1. Unknown (MN)
Hdd: 7399
2. Unknown (WI)
Hdd: 7138
3. Unknown (MA)
Hdd: 6622
4. Unknown (NY)
Hdd: 6588
5. Unknown (NY)
Hdd: 6466
6. Unknown (WA)
Hdd: 6463
7. Unknown (WI)
Hdd: 6450
8. Unknown (MI)
Hdd: 6408
9. Unknown (NY)
Hdd: 6357
10. Unknown (NY)
Hdd: 6273
11. Unknown (IA)
Hdd: 6178
12. Unknown (MI)
Hdd: 6067