[franckl]

we published a calculator if you would like to dig deeper! https://airthium.github.io/airthium.com-calculator/

The COP gets lower as the temperature difference increases as you can expect.

[jbm]

For those, like me, who didn't know this term:

https://en.wikipedia.org/wiki/Coefficient_of_performance

> The coefficient of performance or COP (sometimes CP or CoP) of a heat pump, refrigerator or air conditioning system is a ratio of useful heating or cooling provided to work (energy) required.[1][2] Higher COPs equate to higher efficiency, lower energy (power) consumption and thus lower operating costs.