Construction costs are currently skyrocketing

And your electric car will then be charged daily with 50 kWh in summer, so for 250-300 km? ;)
And how big is your storage? 20 kWh? You fill it up in 4-5 hours in July with a 30 kWp system... and then?

I don't want to discourage you and your solar installer probably calculated everything very well. If you enjoy it, great!
But financially worth it? No way.

Somehow I have the feeling that you only read what you want to read. I never wrote that I want to do it. Only that I could on the roof. It is not even planned to expand it, as I don’t yet know how well I manage with the 13.26 kWp. So calm down a bit and please read more carefully.

I imagine it must be very unpleasant to walk on a 15°C cold floor in the middle of summer because the place above is cooled.

I have rather less trouble with that now. We have underfloor cooling in the office, so it's cool barefoot but not really cold. In heat, it’s actually rather pleasantly cool.

I imagine it would be very unpleasant to walk on 15°C cold floors in the middle of summer because the room is being cooled through them.

No idea = no comment. Ever thought about it?? At 15 degrees you would probably already have condensation problems. Cooling through underfloor heating only provides 2-3 degrees, but it is often enough to dampen peaks..

No idea = no comment. Ever thought about it?? At 15 degrees, you would probably already have condensation problems. Cooling via underfloor heating only brings 2-3 degrees, but often enough to dampen peaks..

That’s true. That’s how it was communicated to us as well. We spoke with a client and asked him what he would do differently in the new build. Underfloor heating temperature control was number one. It’s not comparable to air conditioning, but you can apparently notice the difference.

What does the climate preparation include? Of course, it’s a bit late now to make big changes to the plans, because upstairs in the hallway, for example, we no longer have any possibility for a drill hole in the exterior wall, as it’s one large pane of glass ;)

Precisely the consideration of a possible installation at a later point is what I understand by preparation. In other words, thinking about a potential spot, possibly providing empty conduits during the shell construction, considering the possible outdoor location ... So basically not much, but better beforehand than afterwards.

Precisely the consideration of a possible installation at a later date is what I understand by preparation.
In other words, thinking about a possible space for it, if necessary providing empty conduits already during the shell construction, considering the possible parking space outside .... So basically not much, but better before than after.

OK, then there’s no more preparation possible, we should have thought about that a year ago. Now there is no good place for it anymore. In the stairwell there is the large fixed glazing and next to it there are still windows from the study and bathroom, you can’t do core drillings there either. If then probably sometime a mobile air conditioner with some kind of window adapters, but I assume we’ll have significantly fewer problems with heat than now. Cities simply have a miserable microclimate with all the concrete and asphalt.