Ventilation in prefab houses (wood frame with ETICS) also in solid houses?

So then something is definitely not right with you. The Pluggit actually also has central filters in the device!! And your fresh air intake is at floor level? And you have an air short circuit between fresh air and exhaust air? How far apart are they? And the ventilation system is really not responsible for the dust problem. So either something is completely out of control with you or you are blaming the controlled residential ventilation for many things because of your overall negative attitude towards it...

To be honest, I also don’t like having to justify anymore why we no longer like ventilation.

I have to agree here with . They tried a ventilation system in their previous house – it did not bring the desired result or was perceived as "negative." For what reasons – that is up for speculation. Faulty installation, incorrect usage, older device (the house was, I believe, from 1998 – development has certainly progressed since then).
Anyway: The result of the experiences is that the new house will be built without a ventilation system. That’s okay.

shared their many years of experience with us here, which they certainly did not make up out of thin air (hmm: ventilation – made up out of thin air :cool. Possibly, they also attribute one effect or another to the ventilation or have become especially sensitive to "similar grievances" over the years. You know the feeling – when you notice something (e.g., rattling in the car), you pay more attention to it and perceive it even more strongly.
It should be clear that this is not a general criticism of ventilation systems and that this might no longer be an issue with new systems – especially since they also said that they were enthusiastic about it at first.

The device is in the basement, and yes, the floor is logically not far away (light well). And the supply and exhaust air are each just around a corner. Just like with the heat pump. And the kitchen smell is only noticeable if the wind blows accordingly, and that can happen if the supply and exhaust air are not several meters apart. But strangely, not only I have these little problems I mentioned, but also more people I’ve already talked to, and they are all supposed to have been poorly planned – I doubt that. In the old house without a ventilation system on a busy street, I also had less of this fine dust on the furniture at height (so where you don’t wipe every week because you have to stand on a chair). I am not talking about lint or dust bunnies here. And you can clearly see that quite a bit of dust accumulates on the filters in the bathroom, kitchen, and dressing room. When you clean them, they are gray with dust again after just a few days. What else could this be due to if not the ventilation? I vacuum several times daily and with a central vacuum system, which therefore does not blow dust back into the room.

As I said, I am hearing about your problems for the first time, except for the one with the humidity. Both with the dust and the odors. As I said, the plugit avent P have central filters in the device! However, cooking odors in the house are widespread among owners of recirculation hoods...

I do believe you that after your "experiences" you no longer want a controlled residential ventilation system and I do not want to question that. I just wondered whether causes and effects were correctly interpreted by you...

Has anyone had experience with a prefabricated house (timber frame + ETICS) without a ventilation system?

Yes – and to this day I see only reasons against, but none in favor of a ventilation system. However, this has a lot to do with subjective feelings and behaviors. I can never get used to having an approximately equal temperature level in all rooms. Fresh air has to come from outside, if only because of the associated smell and not being stirred and recirculated five times. If heating is no longer on, the doors are always open anyway and the heating costs are so low that air can be allowed to flow through the house even in winter. And above all: Anything that is not there cannot cause problems or break down. With the money saved, you can indulge in other nice things for the house.

I had to smile at many arguments against controlled residential ventilation.

But now to the facts: we live in a timber frame house with ETICS and controlled residential ventilation. OK, it actually required a certain adjustment compared to before, since the whole house has a balanced and similar temperature level. On the other hand, it is very pleasant, especially in winter. At minus degrees, the annoying, time-consuming (especially in the morning) and unpleasant cross-ventilation is eliminated – and you no longer have to worry much about excessive humidity/mold. And in the morning, when you (again) enter the bedroom: no more musty smell. After showering, the steam is gone again after a short time. The odors during cooking are also gone after a certain time – of course, the extractor hood is responsible for those. Ergo: never without controlled residential ventilation in a new building again. From an economic point of view, the €7,500 it cost us will probably never pay off – but the comfort gain during the cold season is enormous. But it is true that the system still requires some attention: filter changes in the unit and the exhaust vents. But on the other hand, the system does not get dirty and the fresh air is really fresh and clean. And regardless of whether it is a prefab house or a masonry house with/without ETICS without controlled residential ventilation: if it is not ventilated, ventilated little, or ventilated incorrectly, it smells musty everywhere.

Best regards