| Rank | No Fuel Used Heating House Percentage ▼ | School District / Population |
| 1. | 1.6% | Middletown School District / 47,424 |
| 2. | 1.4% | Hartford School District / 125,211 |
| 3. | 1.4% | Columbia School District / 5,472 |
| 4. | 1.4% | Regional School District 18 / 9,954 |
| 5. | 1.3% | Eastford School District / 1,726 |
| 6. | 1.0% | Madison School District / 18,284 |
| 7. | 0.9% | Sherman School District / 3,636 |
| 8. | 0.9% | Redding School District / 9,267 |
| 9. | 0.8% | Cromwell School District / 14,077 |
| 10. | 0.8% | Clinton School District / 13,188 |
| 11. | 0.8% | Andover School District / 3,181 |
| 12. | 0.8% | Regional School District 13 / 11,797 |
| 12. | 0.8% | Hebron School District / 9,627 |
| 14. | 0.7% | Willington School District / 5,994 |
| 15. | 0.7% | Griswold School District / 11,952 |
| 15. | 0.7% | Hartland School District / 2,211 |
| 17. | 0.7% | Regional High School District 09 / 16,860 |
| 17. | 0.7% | West Hartford School District / 63,396 |
| 19. | 0.6% | Regional School District 17 / 14,872 |
| 20. | 0.6% | Old Saybrook School District / 10,222 |
| 20. | 0.6% | New Haven School District / 130,553 |
| 22. | 0.6% | Suffield School District / 15,764 |
| 22. | 0.6% | Ridgefield School District / 25,025 |
| 24. | 0.6% | East Hartford School District / 51,211 |
| 24. | 0.6% | Rocky Hill School District / 19,838 |
| 26. | 0.5% | Seymour School District / 16,551 |
| 27. | 0.5% | Regional High School District 08 / 19,236 |
| 28. | 0.5% | Weston School District / 10,319 |
| 29. | 0.5% | Voluntown School District / 2,602 |
| 30. | 0.5% | Canterbury School District / 5,110 |
| 30. | 0.5% | Woodstock School District / 7,916 |
| 32. | 0.4% | Westbrook School District / 6,916 |
| 33. | 0.4% | Deep River School District / 4,611 |
| 33. | 0.4% | Killingly School District / 17,281 |
| 35. | 0.4% | Ellington School District / 15,725 |
| 35. | 0.4% | Newington School District / 30,652 |
| 35. | 0.4% | Granby School District / 11,310 |
| 38. | 0.4% | Lebanon School District / 7,314 |
| 39. | 0.4% | Cheshire School District / 29,272 |
| 40. | 0.4% | Litchfield School District / 8,365 |
| 40. | 0.4% | Darien School District / 21,190 |
| 42. | 0.4% | East Haven School District / 29,139 |
| 43. | 0.4% | New Fairfield School District / 14,079 |
| 43. | 0.4% | Easton School District / 7,593 |
| 45. | 0.3% | Norwich School District / 40,378 |
| 45. | 0.3% | Waterford School District / 19,499 |
| 45. | 0.3% | Hamden School District / 61,605 |
| 45. | 0.3% | Derby School District / 12,837 |
| 49. | 0.3% | Pomfret School District / 4,216 |
| 49. | 0.3% | Avon School District / 18,298 |
| 49. | 0.3% | Bristol School District / 60,556 |
| 52. | 0.3% | Bridgeport School District / 146,680 |
| 52. | 0.3% | Waterbury School District / 109,887 |
| 52. | 0.3% | Brookfield School District / 16,774 |
| 55. | 0.3% | Regional School District 14 / 13,402 |
| 55. | 0.3% | Regional High School District 19 / 36,619 |
| 55. | 0.3% | Winchester School District / 11,089 |
| 58. | 0.3% | Regional School District 06 / 6,635 |
| 59. | 0.3% | New Britain School District / 73,095 |
| 60. | 0.3% | Montville School District / 19,649 |
| 60. | 0.3% | Name N/A / 218,438 |
| 60. | 0.3% | Farmington School District / 25,515 |
| 63. | 0.3% | Wilton School District / 18,519 |
| 63. | 0.3% | Thompson School District / 9,390 |
| 65. | 0.2% | South Windsor School District / 25,795 |
| 66. | 0.2% | Windsor Locks School District / 12,554 |
| 67. | 0.2% | Stonington School District / 18,539 |
| 67. | 0.2% | Mansfield School District / 26,328 |
| 69. | 0.2% | Westport School District / 27,055 |
| 69. | 0.2% | Enfield School District / 44,713 |
| 71. | 0.2% | West Haven School District / 55,290 |
| 72. | 0.2% | East Lyme School District / 19,118 |
| 72. | 0.2% | New Milford School District / 27,821 |
| 74. | 0.2% | Meriden School District / 60,616 |
| 75. | 0.2% | Trumbull School District / 36,444 |
| 76. | 0.2% | Manchester School District / 58,270 |
| 77. | 0.1% | Watertown School District / 22,286 |
| 77. | 0.1% | Regional School District 16 / 15,680 |
| 79. | 0.1% | Regional School District 15 / 27,451 |
| 80. | 0.1% | Regional High School District 04 / 15,477 |
| 80. | 0.1% | Regional School District 12 / 7,549 |
| 80. | 0.1% | Windsor School District / 29,130 |
| 80. | 0.1% | Stamford School District / 125,401 |
| 84. | 0.1% | Regional School District 10 / 15,035 |
| 85. | 0.1% | Greenwich School District / 62,141 |
| 86. | 0.1% | Norwalk School District / 87,214 |
| 86. | 0.1% | Simsbury School District / 23,681 |
| 86. | 0.1% | Torrington School District / 35,774 |
| 89. | 0.1% | Guilford School District / 22,405 |
| 89. | 0.1% | North Haven School District / 23,997 |
| 91. | 0.1% | Branford School District / 28,066 |
| 91. | 0.1% | Groton School District / 40,136 |
| 91. | 0.1% | Wallingford School District / 45,154 |
| 94. | 0.1% | Glastonbury School District / 34,661 |
| 95. | 0.1% | Stratford School District / 52,092 |
| 96. | 0.0% | Danbury School District / 82,781 |
| 96. | 0.0% | Fairfield School District / 60,678 |
Please note that we only rank locations with 'No Fuel Used Heating House Percentage' data. The rank above might not be a complete list. Locations without 'No Fuel Used Heating House Percentage' data are not listed.
