2000 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | ||
---|---|---|---|---|---|---|---|---|---|---|
Total Cooling System Stock (thousands) | 2689.0 | 4436.9 | 4584.1 | 4614.8 | 4651.2 | 4693.2 | 4740.6 | 4793.4 | 4851.4 | |
System Stock by Type (thousands) | ||||||||||
Room | 751.0 | 988.6 | 1039.9 | 980.3 | 924.2 | 871.2 | 821.3 | 774.2 | 729.8 | |
Central | 1938.0 | 3448.3 | 3544.2 | 3634.5 | 3727.1 | 3822.0 | 3919.4 | 4019.2 | 4121.6 | |
Shares (%) | ||||||||||
Room | 27.9 | 22.3 | 22.7 | 21.2 | 19.9 | 18.6 | 17.3 | 16.2 | 15.0 | |
Central | 72.1 | 77.7 | 77.3 | 78.8 | 80.1 | 81.4 | 82.7 | 83.8 | 85.0 | |
New Unit Efficiencies | ||||||||||
Room (EER)1 | 9.4 | 11.2 | 11.2 | 11.3 | 11.3 | 11.4 | 11.5 | 11.5 | 11.6 | |
Central (SEER)2 | 10.3 | 13.3 | 13.4 | 13.5 | 13.5 | 13.6 | 13.7 | 13.7 | 13.8 | |
Stock Efficiencies | ||||||||||
Room (EER)1 | 8.3 | 10.7 | 10.8 | 10.9 | 10.9 | 11.0 | 11.1 | 11.2 | 11.2 | |
Central (SEER)2 | 9.6 | 11.8 | 12.0 | 12.2 | 12.4 | 12.7 | 12.9 | 13.1 | 13.3 | |
Unit Capacity Ratio (Btu/hour) | ||||||||||
Room | 9,898 | 9,129 | 9,131 | 9,218 | 9,285 | 9,353 | 9,472 | 9,489 | 9,507 | |
Central | 33,466 | 33,282 | 33,291 | 33,140 | 32,989 | 32,827 | 32,634 | 32,637 | 32,640 |
Footnotes:
1) Energy Efficiency Ratio.2) Seasonal Energy Efficiency Ratio.