Quiet decentralized ventilation for new single-family house

Inventer system approx. 6500,- Euro, the others similar.

That’s why the jack of all trades, few wall breakthroughs, quiet and last but not least effective. Does that exist?

Yes, but that would then be a centralized controlled residential ventilation system.

Ok, central, we did not want it for cost reasons and some other disadvantages.. The advantages are of course obvious. Wanted to know if there is such a decentralized system with those features.

A centralized controlled residential ventilation system should not be much more expensive than €6500. Few wall penetrations fundamentally clash with the nature of decentralized systems. However, there are plenty of effective ones, and noise is a matter of perception.

Depending on where you live in Hesse, you might want to consider a trip to Berlin (you can combine it with a short vacation ).
There is a pretty good ventilation office there where you can listen to 4 or 5 different decentralized systems installed in actual conditions.
We found the consultation there to be very good and insightful, and although we live on the other side of Germany, we then ordered our decentralized system there (of course, only when we needed it).
Of course, they will also create a ventilation concept and a cost estimate for you based on your plans (we received this by email).
In my opinion, no one can answer your questions exactly here, because everyone also has a subjective perception (e.g., regarding noise).

So much more expensive than the 6500€ a central controlled residential ventilation system should not be. Few wall penetrations fundamentally conflict with the nature of decentralized systems. There are plenty of effective ones, and noise level is a matter of perception.

A central system costs more than twice as much (around 15,000€). Of course, the house must be completely connected with ventilation ducts over all floors (leading from the utility room). Yes, the wall penetrations are indeed a conflict.

Depending on where you live in Hesse, you might want to consider a trip to Berlin (you can combine it with a short vacation ).
There is a pretty good ventilation office there, where you can listen to 4 or 5 different decentralized systems in installed condition.
We found the consultation there very good and insightful and, although we live at the other end of Germany, we then ordered our decentralized system there (of course only when we actually needed it).
Of course, they also create a ventilation concept and a cost estimate based on your plans (we received this by email).

In my opinion, no one here can answer your questions precisely, since everyone also has a subjective perception (e.g. regarding noise level).

Yes, that sounds interesting, but Berlin is not around the corner—500 km have to be planned ahead. Is there such a center closer by? Otherwise, you just have to pack your bags...

Well, most offer that as a self-assembly kit, which I am not very convinced of, since the warranty issue becomes difficult again.

I assume the offers are in the range I already mentioned here!?