Fewer openable windows with controlled residential ventilation

At how many windows? What area? Windows on all sides? Even in windless conditions and equal indoor and outdoor temperatures? Many factors play a role here. Lots of theory. If not everything fits together at the moment, it really isn't faster. But it feels fresher since it is usually colder. If the factors align, cross-ventilation is naturally faster. In living spaces, 0.5 is required.

We have windows that can be opened in the places where they are needed for cross-ventilation, the rest are fixed glazing, no controlled residential ventilation, bungalow. For aesthetic reasons, I prefer fixed glazing. That is why unfortunately, in one of the floor-to-ceiling fixed glazed corner windows, there is a narrow window that can be opened. We live near the sea, the wind blows from the west (sea) from around 4 pm for 2 hours. We ventilate north-south and west-east. When I am at home, the house is never "closed," except in winter or when it is over 35 degrees, the patio door is always open, the risk of burglary is low.

Yes, the roller shutters are dirty on the inside, but we only have them in the bedrooms and I cannot clean them from the inside. There are worse things.

Yes Rick, I have to disagree, window ventilation is a completely different matter than the [Kontrollierte-Wohnraumlüftung] thing. Perfect air within 5 minutes, the [Kontrollierte-Wohnraumlüftung] needs at least 1 hour at full power for that.

Well, as I said, when I can cross-ventilate. I recall with horror my husband's apartment from ages ago: all windows on the west side – which meant: scalding hot in the evening and ventilation result zero... And even though almost the entire side had windows and all of them could be opened.

Controlled residential ventilation, in my opinion, is never an argument for fixed glazing – I still want to be able to open the windows (but I just don't have to anymore).
Arguments for fixed glazing are
- Appearance
- Cost savings (but it's not that much anyway)
- if I know that this window will not be opened anyway

Counterargument always: Cleaning! If I can't get to the windows any other way, then I have to make them openable.
Dirty blinds really don't bother me – that would not be an argument for me. But a dirty window forever, I wouldn't be interested in that.

is also considering active humidification for your large controlled residential ventilation system. Due to the controlled residential ventilation, we now have very dry air in the house in winter (partly <30% relative humidity). This is unpleasant for the mucous membranes, especially when you are slightly cold anyway. We will have the Hydrobox retrofitted - but the effort to install it directly would have been significantly less.

We also bought a humidifier and are now considering installing an enthalpy exchanger (we are currently checking whether this is possible with our controlled residential ventilation system).

The consideration is definitely worth it, Rick! On the other hand, I have also heard such horror stories about contamination of these systems that I really don't know whether one should or not. The fact is: we have well below 30% and my instruments don't like that at all (neither do we, but we are not there 24 hours either).