KfW 70 without ventilation system

....The repeatedly claimed necessity of a control-engineered ventilation due to moisture removal I therefore cannot comprehend in the slightest. In my opinion, this investment with the corresponding follow-up costs can be saved in the case of a uniformly and well-insulated building structure.

Exactly! However, good business can be made with the fear of mold

v.g.

I'm just wondering where the air flows in that the [Dunstesse] sucks out?! Whether mold or not, that's beside the point; not having to ventilate after showering anymore, but just leaving right away, no musty smell in the bedroom in the morning, cat shit that doesn't smoke up the whole place is worth it to me. Besides, I've become a wimp. I now find it really unpleasant when visiting somewhere and someone quickly opens a window. Disgustingly cold out there.

Hello,

I live in a very well insulated and sealed prefabricated house (not yet KfW 70),

Mhmm ... a "very well insulated" prefabricated house and not even KfW 70

Rhenish greetings

Jo somehow a contradiction in itself, right... I also don't want to miss my controlled residential ventilation... always warm in the place and always fresh air...

Yeah, I agree. If the house smells like cat sh*** and when you open the windows environmental noise, children screaming, exhaust fumes, and dirt stream in, that definitely speaks in favor of a controlled residential ventilation system.

Children crying

Controlled residential ventilation does not help me against that.