Air conditioning is worthwhile (also financially)

Due to the current situation, I would like to share a few experiences here. The cost at that time for a single split including installation was around 3500 euros. After funding, just over 2000 euros. The system saves me around 400 to 500 euros a year on heating (I get a performance figure of around 5). Why? Because it is a mega-efficient heat pump that also works in old buildings (SCOP > 6). Nice side effect, you can also use it to cool down in the summer. Even if I cooled for 50 euros in the summer, it would