| AAHP |
Air-to-air heat pump |
| AC |
Air conditioner |
| ACE |
Annual cooling energy |
| ACL |
Annual cooling load |
| AHE |
Annual heating energy |
| AHL |
Annual heating load |
| AHU |
Air handling unit, or air handler |
| ANSI |
American National Standards Institute, Inc. |
| APF |
Annual performance factor |
| ARI |
Air-Conditioning and Refrigeration Institute |
| ASHP |
Air source heat pump |
| CER |
Certified emission reductions |
| CFC |
Chlorofluorocarbon |
| COP |
Coefficient of performance |
| CSPF |
Cooling seasonal performance factor |
| DX |
Direct expansion |
| DHW |
Domestic hot water |
| EER |
Energy efficiency ratio |
| FCU |
Fan coil unit |
| GIS |
Green investment scheme |
| GHG |
Green house gas |
| GSHP |
Ground source heat pump |
| GWP |
Global warming potential |
| HCFC |
Hydrochlorofluorocarbon |
| HFC |
Hydrofluorocarbon |
| HP |
Heat pump |
| hp |
horsepower |
| HPWH |
Heat pump water heater |
| HSPF |
Heating seasonal performance factor |
| HVAC |
Heating､Ventilating and Air-Conditioning System |
| HX |
Heat exchanger |
| IEA |
International Energy Agency |
| IGCC |
Institute of Global Climate Change |
| IPCC |
Intergovernmental Panel on Climate Change |
| IPF |
Ice packing factor |
| IPLV |
Integrated part load value |
| IRENA |
International Renewable Energy Agency |
| ISO |
International Organization for Standardization |
| kWh |
kilowatt-hour |
| ODP |
Ozone depletion potential |
| PAC |
Packaged ar-conditioner |
| PER |
Primary energy ratio |
| RES |
Renewable energy source |
| SPF |
Seasonal performance factor |
| SEER |
Seasonal energy efficiency ratio |
| TEWI |
Total equivalent warming impact |
| VER |
Verified emission reductions |
| VRF |
Variable refrigerant flow |
| WSHP |
Water source heat pump |