Just learned how the fuck heat pumps work. I remember reading some anon claiming it has around 300% efficiency (for every KW of electricity, you get 3 KW of heat) and I was thinking how it doesn't make any sense, some morons were arguing with him as well.
It makes sense and it is fucking amazing. It is basically like getting rich (heating air) by throwing debt on other people (cooling outdoor air), or if you like: a reverse air conditioner where you are cooling the outdoors and heating your indoors. You are literally stealing heat from the outside, even if the outside is just above freezing temperature.
Only problems with heat pumps is that they get less efficient the closer you get to freezing outdoor temperature, and they cost a lot upfront. I read that you get a return for your investment in less than 3 years though.