@sickburnbro @hazlin @BowsacNoodle @jeffcliff @skylar All the heat rise in the compressor running will come from one of two places in a heat pump system: the environment from which the pump is pulling heat or from the electricity dissipated to run the pump. Everything else I can think of will reduce the temperature of the compressor (heat dissipation to the environment).

As long as you accurately determine the system boundary, measuring is reasonably straightforward.

I also know the political types are either incapable or unwilling to have this done correctly, because it won't give them the numbers they are looking for.