Residential Sector
Atlantic
Table 21: Heating System Stock by Building Type and Heating System Type
  1990   2011 2012 2013 2014 2015
Total Heating System Stock (thousands) 818.7   1,055.2 1,066.0 1,085.8 1,090.7 1,098.6

Heating System Stock by Building Type (thousands)
Single Detached 579.2   741.5 746.9 757.0 759.7 762.7
Single Attached 51.9   76.1 77.9 80.5 81.1 82.2
Apartments 154.6   197.5 200.7 207.5 208.9 212.5
Mobile Homes 33.0   40.2 40.4 40.9 41.0 41.1

Shares (%)
Single Detached 70.8   70.3 70.1 69.7 69.6 69.4
Single Attached 6.3   7.2 7.3 7.4 7.4 7.5
Apartments 18.9   18.7 18.8 19.1 19.2 19.3
Mobile Homes 4.0   3.8 3.8 3.8 3.8 3.7

Heating System Stock by Heating System Type (thousands)
Heating Oil – Normal Efficiency 320.9   10.0 9.6 8.9 6.1 3.7
Heating Oil – Medium Efficiency 16.9   196.6 194.6 194.9 192.6 199.0
Heating Oil – High Efficiency 0.0   0.0 0.0 0.0 0.0 0.0
Natural Gas – Normal Efficiency 2.1   0.8 0.7 0.5 0.4 0.3
Natural Gas – Medium Efficiency 0.2   5.3 5.4 5.7 5.7 5.6
Natural Gas – High Efficiency 0.4   11.7 12.3 17.7 18.3 19.2
Electric 269.6   625.6 631.0 616.4 624.8 626.6
Heat Pump 8.7   30.3 31.8 34.0 34.9 35.8
Other1 12.7   8.4 9.6 13.2 13.2 13.2
Wood 50.5   25.3 27.2 46.3 45.8 46.3

Dual Systems
Wood/Electric 71.3   69.9 71.4 74.2 74.4 74.4
Wood/Heating Oil 62.5   65.8 66.6 68.1 68.3 68.1
Natural Gas/Electric 0.0   0.0 0.0 0.0 0.0 0.0
Heating Oil/Electric 2.9   5.5 5.7 6.0 6.1 6.3

Shares (%)
Heating Oil – Normal Efficiency 39.2   0.9 0.9 0.8 0.6 0.3
Heating Oil – Medium Efficiency 2.1   18.6 18.3 17.9 17.7 18.1
Heating Oil – High Efficiency 0.0   0.0 0.0 0.0 0.0 0.0
Natural Gas – Normal Efficiency 0.3   0.1 0.1 0.0 0.0 0.0
Natural Gas – Medium Efficiency 0.0   0.5 0.5 0.5 0.5 0.5
Natural Gas – High Efficiency 0.1   1.1 1.2 1.6 1.7 1.8
Electric 32.9   59.3 59.2 56.8 57.3 57.0
Heat Pump 1.1   2.9 3.0 3.1 3.2 3.3
Other1 1.5   0.8 0.9 1.2 1.2 1.2
Wood 6.2   2.4 2.6 4.3 4.2 4.2

Dual Systems
Wood/Electric 8.7   6.6 6.7 6.8 6.8 6.8
Wood/Heating Oil 7.6   6.2 6.2 6.3 6.3 6.2
Natural Gas/Electric 0.0   0.0 0.0 0.0 0.0 0.0
Heating Oil/Electric 0.3   0.5 0.5 0.6 0.6 0.6

Footnotes:

1) “Other” includes coal and propane.