2000 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | ||
---|---|---|---|---|---|---|---|---|---|---|
Total Cooling System Stock (thousands) | 95.0 | 439.8 | 468.2 | 487.5 | 507.8 | 529.4 | 552.2 | 576.3 | 601.9 | |
System Stock by Type (thousands) | ||||||||||
Room | 37.0 | 146.3 | 155.0 | 155.4 | 155.9 | 156.4 | 156.9 | 157.4 | 157.9 | |
Central | 58.0 | 293.6 | 313.3 | 332.0 | 351.9 | 372.9 | 395.2 | 418.9 | 443.9 | |
Shares (%) | ||||||||||
Room | 38.9 | 33.3 | 33.1 | 31.9 | 30.7 | 29.6 | 28.4 | 27.3 | 26.2 | |
Central | 61.1 | 66.7 | 66.9 | 68.1 | 69.3 | 70.4 | 71.6 | 72.7 | 73.8 | |
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.