The COP is the Coefficient of Performance. It is the ratio of energy input to output. For example, a unit with a COP of 5, when the input power is 1kw, it will provide 5kw heating capacity output.
And the formal calculation formula is :
According to the calculation result, the COP figure of heat pump will be ranked as A, A+,A++,A+++.
High COP will take huge electricity power saving in home appliance.
How to get higher COP ?
In order to get a higher COP for long term use, Now many pool heat pump and multi function heat pump will take DC inverter technology, Because the DC inverter technology will change its running frequency to adapt its output need, so for long term use, it will result as : taking less power, and output more heating capacity.