Construction costs are currently skyrocketing

Aha, well that sounds different. I would definitely have chosen differently, but well, it's your thing

Aha, well that sounds different. I would have definitely chosen differently, but well, it’s your thing

Oh man... actually don't want to digress, but ok, just briefly, then please BTT. It is (or rather we are in the process of) a renovated old building. Calculation was at 7.9KW. An 8KW would have been too tight, the 9KW was almost the same price as the 13KW, especially since 45% BAFA subsidy also plays a role. Availability also uncertain for anything between 8-12. The big one was at least immediately available except for the outdoor unit. In addition, it has higher efficiency at cold temperatures, meaning the supplementary heating or the "heating element" only kicks in at (now I have to guess because I don't remember exactly) -10°C, with smaller systems it’s earlier. Furthermore, the system should also be able to cool in midsummer, which smaller ones probably cannot or at least not with that efficiency. All this info comes from the consultation by my plumber. I felt very well advised by the plumber, I also know him personally and appreciate him as a competent partner. I don’t think he’s fooling me, otherwise, he won’t get a beer at the housewarming party.