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