2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | ||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Total Apartment Heating System Stock (thousands) | 175.0 | 176.3 | 177.8 | 179.6 | 182.6 | 184.5 | 186.5 | 189.0 | 191.3 | 193.5 | 195.7 | 198.3 | 201.5 | 205.9 | 208.5 | 210.5 | 213.4 | 215.4 | |
Heating System Stock by Heating System Type (thousands) | |||||||||||||||||||
Heating Oil – Normal Efficiency | 39.9 | 37.0 | 34.5 | 32.0 | 29.8 | 27.1 | 24.3 | 21.6 | 19.2 | 16.2 | 13.4 | 11.2 | 9.5 | 8.4 | 6.0 | 4.6 | 3.1 | 1.5 | |
Heating Oil – Medium Efficiency | 36.8 | 40.3 | 43.4 | 45.9 | 48.3 | 50.2 | 52.0 | 53.3 | 54.2 | 54.8 | 55.2 | 55.1 | 54.8 | 54.2 | 54.2 | 52.9 | 51.6 | 50.8 | |
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 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.3 | 0.3 | 0.3 | 0.2 | 0.2 | 0.2 | 0.1 | 0.1 | 0.1 | 0.1 | 0.0 | 0.0 | |
Natural Gas – Medium Efficiency | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 0.9 | 0.9 | |
Natural Gas – High Efficiency | 1.1 | 1.1 | 1.2 | 1.3 | 1.3 | 1.4 | 1.7 | 2.0 | 2.1 | 2.2 | 2.3 | 2.5 | 2.6 | 2.7 | 2.7 | 3.2 | 4.1 | 4.5 | |
Electric | 64.8 | 65.6 | 66.3 | 67.6 | 69.8 | 72.2 | 75.0 | 78.2 | 81.9 | 86.6 | 91.7 | 97.0 | 102.6 | 109.0 | 114.6 | 119.7 | 125.3 | 129.6 | |
Heat Pump | 1.5 | 1.6 | 1.7 | 1.7 | 1.8 | 1.9 | 2.0 | 2.1 | 2.2 | 2.3 | 2.4 | 2.6 | 2.7 | 2.8 | 2.9 | 3.1 | 3.2 | 3.3 | |
Other1 | 2.1 | 2.1 | 2.1 | 2.3 | 2.5 | 2.7 | 2.9 | 3.1 | 3.3 | 3.5 | 3.5 | 3.5 | 3.5 | 3.6 | 3.5 | 3.5 | 3.5 | 3.6 | |
Wood | 25.2 | 25.0 | 25.1 | 25.2 | 25.4 | 25.3 | 25.0 | 25.0 | 24.8 | 24.2 | 23.6 | 22.9 | 22.2 | 21.6 | 20.9 | 19.9 | 19.1 | 18.7 | |
Dual Systems | |||||||||||||||||||
Wood/Electric | 1.2 | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 | 1.4 | 1.4 | 1.4 | 1.4 | 1.4 | 1.4 | 1.4 | |
Wood/Heating Oil | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.9 | 0.9 | |
Natural Gas/Electric | 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 | |
Heating Oil/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 | |
Shares (%) | |||||||||||||||||||
Heating Oil – Normal Efficiency | 22.8 | 21.0 | 19.4 | 17.8 | 16.3 | 14.7 | 13.0 | 11.4 | 10.0 | 8.4 | 6.8 | 5.6 | 4.7 | 4.1 | 2.9 | 2.2 | 1.5 | 0.7 | |
Heating Oil – Medium Efficiency | 21.0 | 22.9 | 24.4 | 25.6 | 26.5 | 27.2 | 27.9 | 28.2 | 28.3 | 28.3 | 28.2 | 27.8 | 27.2 | 26.3 | 26.0 | 25.2 | 24.2 | 23.6 | |
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 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | |
Natural Gas – Medium Efficiency | 0.5 | 0.5 | 0.6 | 0.6 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.4 | 0.4 | |
Natural Gas – High Efficiency | 0.6 | 0.6 | 0.7 | 0.7 | 0.7 | 0.8 | 0.9 | 1.1 | 1.1 | 1.1 | 1.2 | 1.3 | 1.3 | 1.3 | 1.3 | 1.5 | 1.9 | 2.1 | |
Electric | 37.0 | 37.2 | 37.3 | 37.6 | 38.2 | 39.1 | 40.2 | 41.4 | 42.8 | 44.8 | 46.9 | 48.9 | 50.9 | 53.0 | 55.0 | 56.9 | 58.7 | 60.2 | |
Heat Pump | 0.8 | 0.9 | 0.9 | 1.0 | 1.0 | 1.0 | 1.1 | 1.1 | 1.2 | 1.2 | 1.3 | 1.3 | 1.3 | 1.4 | 1.4 | 1.5 | 1.5 | 1.5 | |
Other1 | 1.2 | 1.2 | 1.2 | 1.3 | 1.4 | 1.5 | 1.6 | 1.6 | 1.7 | 1.8 | 1.8 | 1.8 | 1.8 | 1.7 | 1.7 | 1.7 | 1.6 | 1.7 | |
Wood | 14.4 | 14.2 | 14.1 | 14.0 | 13.9 | 13.7 | 13.4 | 13.2 | 13.0 | 12.5 | 12.0 | 11.5 | 11.0 | 10.5 | 10.0 | 9.5 | 8.9 | 8.7 | |
Dual Systems | |||||||||||||||||||
Wood/Electric | 0.7 | 0.7 | 0.7 | 0.7 | 0.7 | 0.7 | 0.7 | 0.7 | 0.7 | 0.7 | 0.7 | 0.7 | 0.7 | 0.7 | 0.7 | 0.7 | 0.7 | 0.7 | |
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 | 0.0 | 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 | |
Heating Oil/Electric | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |