Controlled residential ventilation - What should be considered when purchasing?

Airflow? Where is that supposed to come from?

Because air is sucked out of the rooms and fresh air is blown in, an airflow inevitably arises. And ideally, it should not be noticeable...

Thank you for the answers! Since it was asked here and there, maybe for context: In a show home, the Proxon system installed there was casually promoted to us; something like "silent, you don’t even notice it" and so on. The 15 minutes inside the house were enough for us. I know that it is a different system, but what I want to say with this is: I hope that the air flows in a normal controlled residential ventilation system are much, much lower...

Experience would be really helpful here.

Controlled ventilation has existed for decades (especially in commercial and office buildings). In single-family homes more so since passive houses have existed (> 10 years?). I have now just over 1 year of experience and only with one property. From family, I also know over 7 years in two rental properties (no problems). In any case, I would immediately build again with controlled residential ventilation (and never without).

Using natural building materials when building, like wood and clay, and, if possible, planning rooms generously, also helps to prevent moisture problems.

That may be so, but it does not change the CO2 and other gases, whose levels are permanently kept in a favorable range automatically by controlled residential ventilation.

Because air is sucked out of the rooms and fresh air is blown in, an air flow inevitably arises. And ideally, it should not be noticeable...

If one can call a breeze, which is only noticeable and measurable in the immediate vicinity of the valves, that.

Proxon system praised,

It is not a ventilation system but an air heating system, those are two different things.

Somewhat like comparing a pickup with a dump truck.

It's not ventilation but an air heater, those are two different things. It's kind of like comparing a pickup with a dump truck.

Yes, sure. What I meant is: The airflow of the Proxon is hopefully significantly higher than that of the usual controlled residential ventilation!?

Yes, of course. What I meant to say: Hopefully, the airflow of the Proxon is significantly higher than with the usual controlled residential ventilation!?

We have a ventilation outlet directly above the sofa - when I stand directly under the sofa, I feel a slight draft - sitting, you don’t notice anything at all. The system itself is located in the attic and is inaudible at level 3 out of 4 in everyday use (the refrigerator hums louder).

I was in the neighboring house without a ventilation system last weekend. In short: I’m glad to have one.