This is the problem with characterising heat pumps as '300%' efficient. They're not, they're actually around 30-60% efficient like most other heat engines. It'

This is the problem with characterising heat pumps as '300%' efficient. They're not, they're actually around 30-60% efficient like most other heat engines. It's just the thing they do is move heat so people characterise the 'output'/ work as efficiency when in reality the relevant factor is something like output / output_of_reverse_carnot_cycle. A 100% efficient heat pump would produce exactly as much electricity putting the heat back where it started as it used in the first place.