2000 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | ||
---|---|---|---|---|---|---|---|---|---|---|
Total Cooling System Stock (thousands) | 171.0 | 769.6 | 847.9 | 811.7 | 777.4 | 744.9 | 714.2 | 685.1 | 657.5 | |
System Stock by Type (thousands) | ||||||||||
Room | 88.0 | 340.3 | 371.5 | 364.7 | 358.1 | 351.6 | 345.2 | 338.9 | 332.7 | |
Central | 83.0 | 429.2 | 476.5 | 447.0 | 419.3 | 393.4 | 369.0 | 346.2 | 324.8 | |
Shares (%) | ||||||||||
Room | 51.5 | 44.2 | 43.8 | 44.9 | 46.1 | 47.2 | 48.3 | 49.5 | 50.6 | |
Central | 48.5 | 55.8 | 56.2 | 55.1 | 53.9 | 52.8 | 51.7 | 50.5 | 49.4 | |
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.