Residential Sector
Territories
Table 27: Cooling System Stock by Type, New Unit Efficiencies, Stock Efficiencies and Unit Capacity Ratio
  1990   2015 2016 2017
Total Cooling System Stock (thousands) 0.8   1.8 1.8 1.8

System Stock by Type (thousands)
Room 0.7   1.5 1.5 1.5
Central 0.1   0.3 0.3 0.3

Shares (%)
Room 86.3   83.4 83.0 82.6
Central 13.7   16.6 17.0 17.4

New Unit Efficiencies
Room (EER)1 7.1   12.0 12.0 12.0
Central (SEER)2 9.1   13.0 13.0 13.0

Stock Efficiencies
Room (EER)1 6.8   11.3 11.4 11.5
Central (SEER)2 8.6   11.9 12.1 12.3

Unit Capacity Ratio (Btu/hour)
Room 10,114   9,121 9,132 9,142
Central 32,356   33,215 33,213 33,208

Footnotes:

1) Energy Efficiency Ratio.
2) Seasonal Energy Efficiency Ratio.