Go talk to a physicist about your last two notes. I'm sure he will have a good laugh, and you will learn a lot. Win-win.
Discussion
Or maybe you should 🤷
Explain to me the limits. Why do you say that a heat pump can only get 400%, not 500%?
And then explain why there is groundwater based heat pumps that go up to 500% that you can buy right now.
https://www.heizungsfinder.de/waermepumpe/wirtschaftlichkeit/wirkungsgrad
I won't fall into Brandolini's trap.