COP (Coefficient of Performance) is the coefficient of performance of heat pump and air conditioning systems. The higher the COP, the more efficient the unit is – it produces more heat/cooling with less electricity. For example, COP 4 means that for 1 kW of electricity you get 4 kW of heating.
When choosing an air conditioner or heat pump, always pay attention to COP — this will save you money and increase comfort.