Diffusion-open wall construction - I don't get it!

That's true. Still, it's annoying when you spend €200,000 on a house and then can't even have what you actually want.

That's exactly why I don't understand why people don't look for alternatives.

Exactly for this reason, I don't understand why people don't look for alternatives.

That's exactly what I am doing, which is why I haven't dealt with the decentralized ventilation system yet.

Good evening,

Still, it’s annoying when you put down €200,000 for a house and then can’t even have what you actually want.

You shouldn’t twist it to suit yourself!

If you want to sign with provider H., then do it ... fully committed. If the ventilation system is important to you, then look for another provider or have a decentralized system installed afterwards (you can also purchase the necessary lines from H.) ... without putting H. in a bad light. If I want to have a house built by "X," I can’t expect the equipment from "Y."

Rhenish regards

Help me out here: I want to buy a house near H. (as an example). With controlled residential ventilation. H. says, he doesn't have that. Ok. So where is the problem in involving a provider of controlled residential ventilation early on, who says, here and there I need holes, then at this time it will be installed.

Or does something like that already have to be considered during the production process at the factory?