Oklahoma: 45 cities covered
Across 45 Oklahoma cities with a positive case for switching, the average incremental payback is about 16.1 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.
- Oklahoma City — 712,919 people, 2933 HDD
- Tulsa — 415,154 people, 2787 HDD
- Norman — 131,010 people, 2787 HDD
- Broken Arrow — 122,756 people, 2849 HDD
- Edmond — 99,040 people, 2686 HDD
- Lawton — 90,027 people, 1964 HDD
- Moore — 63,845 people, 2787 HDD
- Midwest City — 58,505 people, 2629 HDD
- Enid — 50,519 people, 3355 HDD
- Stillwater — 50,138 people, 3025 HDD
- Owasso — 42,821 people, 2787 HDD
- Bartlesville — 38,355 people, 3359 HDD
- Muskogee — 36,849 people, 2689 HDD
- Shawnee — 32,092 people, 2570 HDD
- Bixby — 31,728 people, 2849 HDD
- Jenks — 27,869 people, 2849 HDD
- Yukon — 27,068 people, 2789 HDD
- Ardmore — 25,064 people, 2343 HDD
- Ponca City — 24,234 people, 3114 HDD
- Mustang — 23,965 people, 2933 HDD
- Sapulpa — 23,297 people, 2849 HDD
- Duncan — 23,174 people, 2524 HDD
- Del City — 21,272 people, 2629 HDD
- Durant — 20,908 people, 2175 HDD
- Claremore — 20,602 people, 2958 HDD
- Bethany — 20,421 people, 2841 HDD
- Sand Springs — 20,330 people, 2426 HDD
- El Reno — 20,041 people, 2789 HDD
- Altus — 18,543 people, 2710 HDD
- McAlester — 18,108 people, 2502 HDD
- Tahlequah — 17,319 people, 3213 HDD
- Chickasha — 17,014 people, 2952 HDD
- Ada — 16,578 people, 2431 HDD
- Newcastle — 14,677 people, 2787 HDD
- Glenpool — 14,567 people, 2849 HDD
- Miami — 12,886 people, 3219 HDD
- Guymon — 12,397 people, 3931 HDD
- Choctaw — 12,358 people, 2629 HDD
- Weatherford — 12,047 people, 3089 HDD
- Woodward — 11,750 people, 3564 HDD
- Guthrie — 11,682 people, 2686 HDD
- Elk City — 11,383 people, 2963 HDD
- Okmulgee — 11,354 people, 2803 HDD
- Coweta — 11,093 people, 2849 HDD
- Warr Acres — 10,456 people, 2841 HDD