2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | ||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Total Heating System Stock (thousands) | 401.8 | 403.8 | 406.2 | 409.3 | 412.1 | 415.3 | 418.1 | 422.4 | 428.3 | 433.0 | 437.8 | 443.7 | 450.8 | 458.4 | 466.9 | 473.6 | 479.3 | 484.3 | |
Heating System Stock by Building Type (thousands) | |||||||||||||||||||
Single Detached | 293.9 | 295.3 | 296.8 | 298.6 | 300.3 | 302.2 | 304.0 | 307.1 | 311.1 | 314.0 | 317.4 | 321.0 | 324.7 | 328.6 | 332.6 | 335.6 | 337.8 | 340.5 | |
Single Attached | 22.0 | 22.4 | 22.8 | 23.5 | 24.1 | 24.8 | 25.4 | 26.1 | 27.0 | 27.6 | 28.2 | 28.9 | 30.0 | 31.4 | 33.0 | 34.2 | 35.1 | 36.1 | |
Apartments | 74.2 | 74.6 | 74.9 | 75.4 | 75.9 | 76.4 | 76.7 | 77.1 | 78.0 | 79.1 | 79.8 | 81.2 | 83.4 | 85.7 | 88.4 | 90.8 | 93.4 | 94.6 | |
Mobile Homes | 11.6 | 11.6 | 11.7 | 11.7 | 11.8 | 11.9 | 11.9 | 12.0 | 12.2 | 12.3 | 12.4 | 12.5 | 12.7 | 12.8 | 12.9 | 13.0 | 13.1 | 13.2 | |
Shares (%) | |||||||||||||||||||
Single Detached | 73.2 | 73.1 | 73.1 | 73.0 | 72.9 | 72.8 | 72.7 | 72.7 | 72.6 | 72.5 | 72.5 | 72.4 | 72.0 | 71.7 | 71.2 | 70.9 | 70.5 | 70.3 | |
Single Attached | 5.5 | 5.5 | 5.6 | 5.8 | 5.8 | 6.0 | 6.1 | 6.2 | 6.3 | 6.4 | 6.4 | 6.5 | 6.7 | 6.8 | 7.1 | 7.2 | 7.3 | 7.4 | |
Apartments | 18.5 | 18.5 | 18.4 | 18.4 | 18.4 | 18.4 | 18.4 | 18.3 | 18.2 | 18.3 | 18.2 | 18.3 | 18.5 | 18.7 | 18.9 | 19.2 | 19.5 | 19.5 | |
Mobile Homes | 2.9 | 2.9 | 2.9 | 2.9 | 2.9 | 2.9 | 2.9 | 2.9 | 2.8 | 2.8 | 2.8 | 2.8 | 2.8 | 2.8 | 2.8 | 2.8 | 2.7 | 2.7 | |
Heating System Stock by Heating System Type (thousands) | |||||||||||||||||||
Heating Oil – Normal Efficiency | 7.3 | 5.0 | 2.9 | 1.7 | 1.2 | 0.7 | 0.4 | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | |
Heating Oil – Medium Efficiency | 8.2 | 10.2 | 10.3 | 10.5 | 10.6 | 10.5 | 10.5 | 10.5 | 10.4 | 10.4 | 10.4 | 10.3 | 10.3 | 10.3 | 10.3 | 10.2 | 10.0 | 9.6 | |
Heating Oil – High Efficiency | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | |
Natural Gas – Normal Efficiency | 193.7 | 181.0 | 168.2 | 154.4 | 139.5 | 124.3 | 109.5 | 94.6 | 80.4 | 67.3 | 54.9 | 43.1 | 32.2 | 22.3 | 14.1 | 6.9 | 3.6 | 2.4 | |
Natural Gas – Medium Efficiency | 86.9 | 94.8 | 103.3 | 111.7 | 119.5 | 127.2 | 134.0 | 138.6 | 142.3 | 143.4 | 142.7 | 141.7 | 140.3 | 137.8 | 134.6 | 130.5 | 124.9 | 118.5 | |
Natural Gas – High Efficiency | 65.2 | 72.4 | 80.9 | 90.2 | 100.0 | 110.8 | 121.2 | 134.9 | 149.8 | 164.8 | 180.6 | 196.6 | 212.8 | 228.9 | 244.2 | 257.2 | 266.7 | 274.9 | |
Electric | 11.6 | 11.1 | 10.7 | 10.3 | 10.1 | 10.3 | 10.9 | 11.9 | 13.4 | 15.4 | 18.0 | 21.0 | 24.5 | 28.6 | 33.3 | 38.4 | 44.0 | 48.9 | |
Heat Pump | 6.7 | 7.0 | 7.4 | 7.7 | 8.0 | 8.3 | 8.6 | 9.0 | 9.4 | 9.7 | 10.1 | 10.5 | 10.9 | 11.3 | 11.8 | 12.2 | 12.5 | 12.8 | |
Other1 | 6.8 | 6.9 | 6.9 | 7.0 | 7.0 | 7.0 | 7.0 | 7.0 | 6.9 | 6.8 | 6.7 | 6.6 | 6.5 | 6.5 | 6.4 | 6.3 | 6.1 | 6.1 | |
Wood | 6.1 | 6.2 | 6.3 | 6.6 | 6.7 | 6.7 | 6.6 | 6.3 | 6.0 | 5.6 | 4.8 | 4.1 | 3.4 | 2.9 | 2.4 | 1.9 | 1.5 | 1.2 | |
Dual Systems | |||||||||||||||||||
Wood/Electric | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.4 | 2.4 | 2.4 | 2.4 | 2.4 | 2.4 | 2.4 | 2.4 | 2.4 | 2.4 | 2.3 | |
Wood/Heating Oil | 4.1 | 4.1 | 4.1 | 4.0 | 4.0 | 4.0 | 4.0 | 3.9 | 3.9 | 3.9 | 3.9 | 3.9 | 3.9 | 3.8 | 3.8 | 3.8 | 3.8 | 3.8 | |
Natural Gas/Electric | 1.5 | 1.5 | 1.6 | 1.6 | 1.7 | 1.7 | 1.8 | 1.8 | 1.8 | 1.9 | 1.9 | 2.0 | 2.0 | 2.1 | 2.1 | 2.2 | 2.2 | 2.2 | |
Heating Oil/Electric | 1.1 | 1.1 | 1.2 | 1.2 | 1.2 | 1.3 | 1.3 | 1.3 | 1.4 | 1.4 | 1.4 | 1.5 | 1.5 | 1.5 | 1.6 | 1.6 | 1.6 | 1.6 | |
Shares (%) | |||||||||||||||||||
Heating Oil – Normal Efficiency | 1.8 | 1.3 | 0.7 | 0.4 | 0.3 | 0.2 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | |
Heating Oil – Medium Efficiency | 2.1 | 2.5 | 2.5 | 2.6 | 2.6 | 2.5 | 2.5 | 2.5 | 2.4 | 2.4 | 2.4 | 2.3 | 2.3 | 2.2 | 2.2 | 2.2 | 2.1 | 2.0 | |
Heating Oil – High Efficiency | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | |
Natural Gas – Normal Efficiency | 48.2 | 44.8 | 41.4 | 37.7 | 33.9 | 29.9 | 26.2 | 22.4 | 18.8 | 15.5 | 12.5 | 9.7 | 7.1 | 4.9 | 3.0 | 1.5 | 0.7 | 0.5 | |
Natural Gas – Medium Efficiency | 21.6 | 23.5 | 25.4 | 27.3 | 29.0 | 30.6 | 32.1 | 32.8 | 33.2 | 33.1 | 32.6 | 31.9 | 31.1 | 30.1 | 28.8 | 27.6 | 26.1 | 24.5 | |
Natural Gas – High Efficiency | 16.2 | 17.9 | 19.9 | 22.0 | 24.3 | 26.7 | 29.0 | 31.9 | 35.0 | 38.1 | 41.2 | 44.3 | 47.2 | 49.9 | 52.3 | 54.3 | 55.6 | 56.8 | |
Electric | 2.9 | 2.7 | 2.6 | 2.5 | 2.5 | 2.5 | 2.6 | 2.8 | 3.1 | 3.6 | 4.1 | 4.7 | 5.4 | 6.2 | 7.1 | 8.1 | 9.2 | 10.1 | |
Heat Pump | 1.7 | 1.7 | 1.8 | 1.9 | 1.9 | 2.0 | 2.1 | 2.1 | 2.2 | 2.2 | 2.3 | 2.4 | 2.4 | 2.5 | 2.5 | 2.6 | 2.6 | 2.6 | |
Other1 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.6 | 1.6 | 1.6 | 1.5 | 1.5 | 1.4 | 1.4 | 1.4 | 1.3 | 1.3 | 1.3 | |
Wood | 1.5 | 1.5 | 1.5 | 1.6 | 1.6 | 1.6 | 1.6 | 1.5 | 1.4 | 1.3 | 1.1 | 0.9 | 0.8 | 0.6 | 0.5 | 0.4 | 0.3 | 0.2 | |
Dual Systems | |||||||||||||||||||
Wood/Electric | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | |
Wood/Heating Oil | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | |
Natural Gas/Electric | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.5 | 0.5 | 0.5 | 0.5 | |
Heating Oil/Electric | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 |