The comment you're replying to probably meant to say it has a coefficient of performance [1, 2] of 3-4. [1] https://en.wikipedia.org/wiki/Coefficient_of_perfor

The comment you're replying to probably meant to say it has a coefficient of performance [1, 2] of 3-4. [1] https://en.wikipedia.org/wiki/Coefficient_of_performance https://en.wikipedia.org/wiki/Coefficient_of_performance [2] https://en.wikipedia.org/wiki/Heat_pump#Performance https://en.wikipedia.org/wiki/Heat_pump#Performance