2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | ||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Total Apartments Heating System Stock (thousands) | 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 | |
Heating System Stock by Heating System Type (thousands) | |||||||||||||||||||
Heating Oil – Normal Efficiency | 2.4 | 2.0 | 1.6 | 1.3 | 0.9 | 0.6 | 0.3 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | |
Heating Oil – Medium Efficiency | 1.6 | 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 | 1.9 | |
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 | 37.4 | 35.2 | 33.0 | 30.7 | 28.1 | 25.5 | 22.8 | 20.1 | 17.4 | 14.9 | 12.5 | 10.2 | 8.2 | 6.3 | 4.7 | 3.4 | 2.5 | 1.6 | |
Natural Gas – Medium Efficiency | 15.1 | 16.5 | 17.9 | 19.3 | 20.8 | 22.2 | 23.4 | 24.2 | 24.8 | 24.9 | 24.7 | 24.4 | 24.0 | 23.5 | 22.9 | 22.1 | 21.2 | 20.2 | |
Natural Gas – High Efficiency | 12.4 | 13.7 | 15.2 | 16.9 | 18.8 | 20.9 | 22.9 | 25.4 | 28.2 | 31.4 | 34.4 | 37.9 | 41.9 | 45.9 | 50.0 | 53.4 | 56.7 | 58.8 | |
Electric | 2.5 | 2.4 | 2.3 | 2.2 | 2.2 | 2.3 | 2.4 | 2.6 | 2.8 | 3.2 | 3.7 | 4.3 | 5.0 | 5.8 | 6.8 | 7.9 | 9.2 | 10.2 | |
Heat Pump | 0.1 | 0.1 | 0.1 | 0.1 | 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 | |
Other1 | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | |
Wood | 1.5 | 1.5 | 1.5 | 1.6 | 1.6 | 1.6 | 1.6 | 1.5 | 1.4 | 1.4 | 1.2 | 1.1 | 1.0 | 0.9 | 0.8 | 0.7 | 0.7 | 0.6 | |
Dual Systems | |||||||||||||||||||
Wood/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 | |
Wood/Heating Oil | 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/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 | 0.0 | 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 | |
Shares (%) | |||||||||||||||||||
Heating Oil – Normal Efficiency | 3.2 | 2.7 | 2.1 | 1.7 | 1.2 | 0.7 | 0.4 | 0.1 | 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 | 2.6 | 2.6 | 2.7 | 2.7 | 2.7 | 2.6 | 2.6 | 2.6 | 2.6 | 2.5 | 2.5 | 2.4 | 2.3 | 2.3 | 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 | 50.4 | 47.2 | 44.1 | 40.7 | 37.0 | 33.3 | 29.7 | 26.0 | 22.3 | 18.8 | 15.7 | 12.6 | 9.8 | 7.3 | 5.3 | 3.7 | 2.6 | 1.7 | |
Natural Gas – Medium Efficiency | 20.3 | 22.1 | 23.9 | 25.6 | 27.4 | 29.1 | 30.5 | 31.3 | 31.8 | 31.5 | 30.9 | 30.0 | 28.8 | 27.4 | 25.9 | 24.4 | 22.7 | 21.4 | |
Natural Gas – High Efficiency | 16.7 | 18.4 | 20.3 | 22.5 | 24.8 | 27.4 | 29.9 | 32.9 | 36.1 | 39.7 | 43.2 | 46.7 | 50.3 | 53.6 | 56.5 | 58.9 | 60.7 | 62.2 | |
Electric | 3.3 | 3.2 | 3.1 | 3.0 | 2.9 | 3.0 | 3.1 | 3.3 | 3.6 | 4.1 | 4.6 | 5.3 | 6.0 | 6.8 | 7.7 | 8.7 | 9.8 | 10.8 | |
Heat Pump | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | |
Other1 | 1.7 | 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 | 1.3 | 1.3 | 1.3 | |
Wood | 2.0 | 2.0 | 2.0 | 2.1 | 2.1 | 2.1 | 2.0 | 2.0 | 1.9 | 1.7 | 1.5 | 1.3 | 1.2 | 1.0 | 0.9 | 0.8 | 0.7 | 0.6 | |
Dual Systems | |||||||||||||||||||
Wood/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 | |
Wood/Heating Oil | 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/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 | 0.0 | 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 |