Efficient compressors, variable speed compressors and larger heat exchangers all contribute to heat pump efficiency. Residential ground source heat pumps on the market today have standard COPs ranging from 2.4 to 5.0 and EERs ranging from 10.6 to 30.
Heat pump efficiency is enhanced by using efficient compressors, variable speed compressors, and larger heat exchangers. Residential ground source heat pumps currently available have a typical coefficient of performance (COP) between 2.4 and 5.0, and an energy efficiency ratio (EER) ranging from 10.6 to 30.