The efficiency of a heat pump system is expressed as a coefficient of performance (CoP). The higher the CoP, the more efficient the system is and the less energy it consumes.
The best way to help consumers choose a heat pump and to assess its energy efficiency is with energy stars. Red stars indicate heating efficiency and blue stars indicate cooling efficiency. The more stars a heat pump has, the more energy you will save and incur fewer operating costs.
Modern heat pumps are highly energy efficient. FERIS heat pumps have an A+++ energy class, which ensures high energy efficiency.