Residential Sector
Territories
Table 21: Heating System Stock by Building Type and Heating System Type
  2000   2018 2019 2020 2021
Total Heating System Stock (thousands) 31.6   44.1 45.1 46.1 47.1

Heating System Stock by Building Type (thousands)
Single Detached 16.9   22.7 23.2 23.7 24.3
Single Attached 6.2   8.8 9.0 9.3 9.5
Apartments 5.8   9.5 9.7 9.9 10.1
Mobile Homes 2.8   3.2 3.2 3.2 3.2

Shares (%)
Single Detached 53.5   51.3 51.4 51.4 51.5
Single Attached 19.5   19.9 20.0 20.1 20.1
Apartments 18.3   21.6 21.6 21.5 21.5
Mobile Homes 8.8   7.2 7.1 6.9 6.8

Heating System Stock by Heating System Type (thousands)
Heating Oil – Normal Efficiency 11.7   1.9 1.4 2.0 0.9
Heating Oil – Medium Efficiency 9.1   26.4 27.5 27.5 29.1
Heating Oil – High Efficiency 0.0   0.0 0.0 0.0 0.0
Natural Gas – Normal Efficiency 1.8   0.1 0.1 0.0 0.0
Natural Gas – Medium Efficiency 2.2   3.4 3.2 3.1 3.0
Natural Gas – High Efficiency 1.1   5.0 5.3 5.7 6.2
Electric 1.1   1.1 1.2 1.2 1.2
Heat Pump 0.0   0.0 0.0 0.0 0.0
Other1 3.1   4.0 4.1 4.2 4.2
Wood 1.7   2.3 2.3 2.4 2.4

Dual Systems
Wood/Electric 0.0   0.0 0.0 0.0 0.0
Wood/Heating Oil 0.0   0.0 0.0 0.0 0.0
Natural Gas/Electric 0.0   0.0 0.0 0.0 0.0
Heating Oil/Electric 0.0   0.0 0.0 0.0 0.0

Shares (%)
Heating Oil – Normal Efficiency 36.9   4.2 3.2 4.4 2.0
Heating Oil – Medium Efficiency 28.7   59.9 61.0 59.7 61.8
Heating Oil – High Efficiency 0.0   0.0 0.0 0.0 0.0
Natural Gas – Normal Efficiency 5.6   0.2 0.1 0.1 0.1
Natural Gas – Medium Efficiency 6.9   7.7 7.2 6.7 6.3
Natural Gas – High Efficiency 3.6   11.2 11.8 12.3 13.2
Electric 3.3   2.6 2.6 2.6 2.6
Heat Pump 0.0   0.0 0.0 0.0 0.0
Other1 9.7   9.0 9.0 9.0 9.0
Wood 5.2   5.2 5.2 5.2 5.1

Dual Systems
Wood/Electric 0.0   0.0 0.0 0.0 0.0
Wood/Heating Oil 0.0   0.0 0.0 0.0 0.0
Natural Gas/Electric 0.0   0.0 0.0 0.0 0.0
Heating Oil/Electric 0.0   0.0 0.0 0.0 0.0

Footnotes:

1) “Other” includes coal and propane.