2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | ||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Total Single Attached Heating System Stock (thousands) | 1,285 | 1,314 | 1,344 | 1,375 | 1,410 | 1,446 | 1,483 | 1,520 | 1,555 | 1,588 | 1,619 | 1,650 | 1,682 | 1,715 | 1,748 | 1,779 | 1,811 | 1,845 | |
Heating System Stock by Heating System Type (thousands) | |||||||||||||||||||
Heating Oil – Normal Efficiency | 59 | 51 | 41 | 35 | 29 | 24 | 18 | 12 | 8 | 5 | 3 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | |
Heating Oil – Medium Efficiency | 71 | 77 | 82 | 85 | 90 | 92 | 94 | 95 | 95 | 95 | 95 | 95 | 94 | 93 | 91 | 88 | 85 | 81 | |
Heating Oil – High Efficiency | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
Natural Gas – Normal Efficiency | 322 | 305 | 286 | 265 | 240 | 215 | 189 | 164 | 140 | 116 | 94 | 73 | 54 | 36 | 20 | 7 | 3 | 1 | |
Natural Gas – Medium Efficiency | 231 | 250 | 271 | 290 | 311 | 330 | 347 | 362 | 371 | 377 | 375 | 372 | 367 | 359 | 350 | 337 | 321 | 302 | |
Natural Gas – High Efficiency | 140 | 159 | 181 | 205 | 232 | 260 | 292 | 323 | 358 | 391 | 427 | 463 | 500 | 539 | 579 | 619 | 654 | 690 | |
Electric | 342 | 348 | 355 | 363 | 372 | 386 | 402 | 417 | 434 | 453 | 471 | 489 | 507 | 525 | 543 | 561 | 579 | 597 | |
Heat Pump | 29 | 31 | 33 | 35 | 37 | 39 | 41 | 43 | 45 | 47 | 49 | 51 | 54 | 56 | 58 | 60 | 62 | 64 | |
Other1 | 15 | 15 | 16 | 16 | 16 | 17 | 17 | 18 | 19 | 20 | 21 | 22 | 24 | 25 | 27 | 29 | 31 | 33 | |
Wood | 45 | 45 | 46 | 47 | 48 | 50 | 49 | 50 | 49 | 48 | 46 | 44 | 42 | 40 | 38 | 36 | 34 | 33 | |
Dual Systems | |||||||||||||||||||
Wood/Electric | 12 | 12 | 12 | 12 | 12 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 14 | 14 | 14 | 14 | 14 | 14 | |
Wood/Heating Oil | 5 | 5 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 7 | |
Natural Gas/Electric | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | |
Heating Oil/Electric | 11 | 12 | 12 | 13 | 13 | 13 | 14 | 14 | 14 | 14 | 15 | 15 | 15 | 16 | 16 | 16 | 17 | 17 | |
Shares (%) | |||||||||||||||||||
Heating Oil – Normal Efficiency | 4.6 | 3.9 | 3.0 | 2.5 | 2.1 | 1.6 | 1.2 | 0.8 | 0.5 | 0.3 | 0.2 | 0.1 | 0.1 | 0.1 | 0.1 | 0.0 | 0.0 | 0.0 | |
Heating Oil – Medium Efficiency | 5.5 | 5.9 | 6.1 | 6.2 | 6.4 | 6.4 | 6.3 | 6.2 | 6.1 | 6.0 | 5.9 | 5.7 | 5.6 | 5.4 | 5.2 | 5.0 | 4.7 | 4.4 | |
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 | 25.0 | 23.2 | 21.3 | 19.3 | 17.0 | 14.9 | 12.8 | 10.8 | 9.0 | 7.3 | 5.8 | 4.4 | 3.2 | 2.1 | 1.2 | 0.4 | 0.2 | 0.1 | |
Natural Gas – Medium Efficiency | 18.0 | 19.0 | 20.2 | 21.1 | 22.1 | 22.8 | 23.4 | 23.8 | 23.9 | 23.7 | 23.2 | 22.5 | 21.8 | 21.0 | 20.0 | 18.9 | 17.7 | 16.4 | |
Natural Gas – High Efficiency | 10.9 | 12.1 | 13.5 | 14.9 | 16.5 | 18.0 | 19.7 | 21.3 | 23.0 | 24.6 | 26.4 | 28.1 | 29.7 | 31.4 | 33.1 | 34.8 | 36.1 | 37.4 | |
Electric | 26.6 | 26.5 | 26.4 | 26.4 | 26.4 | 26.7 | 27.1 | 27.5 | 27.9 | 28.5 | 29.1 | 29.6 | 30.2 | 30.6 | 31.1 | 31.5 | 32.0 | 32.4 | |
Heat Pump | 2.3 | 2.4 | 2.4 | 2.5 | 2.6 | 2.7 | 2.8 | 2.8 | 2.9 | 3.0 | 3.0 | 3.1 | 3.2 | 3.2 | 3.3 | 3.4 | 3.4 | 3.5 | |
Other1 | 1.2 | 1.2 | 1.2 | 1.2 | 1.1 | 1.1 | 1.2 | 1.2 | 1.2 | 1.3 | 1.3 | 1.3 | 1.4 | 1.5 | 1.5 | 1.6 | 1.7 | 1.8 | |
Wood | 3.5 | 3.4 | 3.4 | 3.4 | 3.4 | 3.4 | 3.3 | 3.3 | 3.1 | 3.0 | 2.8 | 2.7 | 2.5 | 2.3 | 2.2 | 2.0 | 1.9 | 1.8 | |
Dual Systems | |||||||||||||||||||
Wood/Electric | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | |
Wood/Heating Oil | 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 | 0.4 | 0.4 | 0.4 | 0.4 | |
Natural Gas/Electric | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | |
Heating Oil/Electric | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 |