KfW 55 - Ventilation system yes/no? - Experiences

First of all, don't panic so much..! If the system fails, no air will come into the house, and you can't breathe anymore and die.

Reading this thread was really worth its weight in gold. Initially, we wanted to build a prefabricated house. This was ruled out for various reasons. Our three general contractors had completely different opinions regarding the controlled residential ventilation. These ranged from "it’s not necessary in a solid house and we do it without in 90% of cases" to "we could do it on explicit request" to "we plan controlled residential ventilation. However, if you reject it, we exclude the warranty against mold from the contract."

After reading the thread, I’m really happy that the last general contractor is currently our favorite. Our simple idea was to trust the general contractor with whom we had the best gut feeling. Controlled residential ventilation was not a relevant knockout criterion (especially since we have someone from building services technology in our circle of acquaintances who told us the story about the "really bad pipelines"). Now I’m glad that it will probably be the general contractor, for other reasons, who offers controlled residential ventilation as standard.

It was similar for us too - that's why I originally created this thread :D The opinions differ completely - but in the end we also decided to trust the general contractor, to install the controlled residential ventilation, and thus we are also much more at ease :D

I witnessed your change of opinion up close in fast forward within one hour yesterday. Surely, you must have thought more than once in the meantime that the forum is simply awesome.
Has your construction already started?