 Seasonally adjusted heating and cooling efficiencies are given by the heating seasonal performance factor (HSPF) and seasonal energy efficiency ratio (SEER) respectively.In units charged with HFC refrigerants, the COP is reduced when heat pumps are used to heat domestic water to over 60 °C or to heat conventional central heating systems that use radiators to distribute heat (instead of an underfloor heating array).Units charged with HFC refrigerants are often marketed as low energy or a sustainable technology, however if the HFC leaks out from the system, there is potential to contribute to global warming, as measured in global warming potential (GWP) and ozone depletion potential (ODP).