[bergenty]

You’ve got to expound on this a little more because 300-400% efficiency doesn’t make sense.

[Orochikaku]

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

[2] https://en.wikipedia.org/wiki/Heat_pump#Performance