2000 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | ||
---|---|---|---|---|---|---|---|---|
Total Apartments Heating System Stock (thousands) | 3,839 | 4,872 | 4,952 | 5,042 | 5,131 | 5,235 | 5,350 | |
Heating System Stock by Heating System Type (thousands) | ||||||||
Heating Oil – Normal Efficiency | 200 | 4 | 2 | 1 | 1 | 0 | 0 | |
Heating Oil – Medium Efficiency | 266 | 281 | 266 | 248 | 228 | 206 | 184 | |
Heating Oil – High Efficiency | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
Natural Gas – Normal Efficiency | 807 | 20 | 6 | 1 | 1 | 0 | 0 | |
Natural Gas – Medium Efficiency | 491 | 661 | 623 | 580 | 538 | 496 | 456 | |
Natural Gas – High Efficiency | 308 | 1,357 | 1,435 | 1,515 | 1,595 | 1,682 | 1,774 | |
Electric | 1,464 | 2,219 | 2,285 | 2,355 | 2,420 | 2,493 | 2,569 | |
Heat Pump | 29 | 58 | 60 | 63 | 65 | 68 | 72 | |
Other1 | 36 | 65 | 70 | 76 | 80 | 84 | 89 | |
Wood | 170 | 113 | 108 | 103 | 102 | 101 | 100 | |
Dual Systems | ||||||||
Wood/Electric | 20 | 25 | 25 | 26 | 26 | 27 | 27 | |
Wood/Heating Oil | 9 | 10 | 11 | 11 | 11 | 11 | 11 | |
Natural Gas/Electric | 11 | 18 | 19 | 19 | 20 | 20 | 21 | |
Heating Oil/Electric | 28 | 41 | 42 | 43 | 45 | 46 | 47 | |
Shares (%) | ||||||||
Heating Oil – Normal Efficiency | 5.2 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | |
Heating Oil – Medium Efficiency | 6.9 | 5.8 | 5.4 | 4.9 | 4.4 | 3.9 | 3.4 | |
Heating Oil – High Efficiency | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | |
Natural Gas – Normal Efficiency | 21.0 | 0.4 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | |
Natural Gas – Medium Efficiency | 12.8 | 13.6 | 12.6 | 11.5 | 10.5 | 9.5 | 8.5 | |
Natural Gas – High Efficiency | 8.0 | 27.8 | 29.0 | 30.0 | 31.1 | 32.1 | 33.2 | |
Electric | 38.1 | 45.5 | 46.1 | 46.7 | 47.2 | 47.6 | 48.0 | |
Heat Pump | 0.8 | 1.2 | 1.2 | 1.2 | 1.3 | 1.3 | 1.3 | |
Other1 | 0.9 | 1.3 | 1.4 | 1.5 | 1.6 | 1.6 | 1.7 | |
Wood | 4.4 | 2.3 | 2.2 | 2.0 | 2.0 | 1.9 | 1.9 | |
Dual Systems | ||||||||
Wood/Electric | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | |
Wood/Heating Oil | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | |
Natural Gas/Electric | 0.3 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | |
Heating Oil/Electric | 0.7 | 0.8 | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 |