Possibility to open windows with controlled residential ventilation - planning ideas

We only have double doors, without a fixed mullion. Daily, only one wing is open, and if in a good mood, all of them.

I understand it as you also only have "wing doors"?

Exactly, also without a central stile. In the 1-meter or 2-meter grid. I don't like the lift-thing doors, they are heavy and not functional for quickly opening the door. My parents still have the normal sliding doors over 6 meters, 3 panels. But I like it the way it is. For that, I have more space without tightness, where the wings have room. Take your freedoms!

The skylights can be tilted here, operated from below with an electric drive, in summer they are constantly open and, together with the tilted bedroom windows, create a chimney effect for ventilation and cooling

, what do you actually do in the evening with a 3 x 3m window front? Then you have a black wall that is almost 10m long, in which every person and everything in the room is reflected?

Strive for a middle ground. Where it seems practical to you, use fixed glass, but still make sure that in every room there are enough windows with opening sashes so you can do cross-ventilation from time to time. Personally, I have had little need to ventilate so far. I rather have to remind myself that we should still do it additionally at the moment to get the moisture out of the house (although the controlled residential ventilation system also helps with that).
Only in the office, when we both game together in the evening, does the desire to ventilate arise. However, this is more because of the heat development and less because of the air quality. If two gaming PCs run under load for two hours, the room temperature sometimes rises to 28°C, and that with the ERR completely turned off. :D
Do you maybe have acquaintances who already have a house with controlled residential ventilation and rarely ventilate manually? Invite yourself there on a Sunday and tell them to close the windows beforehand so you can get an impression of the air in the house through controlled residential ventilation.
The effects that hampshire describes, of the great air after a summer rain, etc., I know those too. However, only when I go outside. I cannot claim that I have ever been able to bring this post-rain air into the house by ventilating.

More important than the number of windows is the position. You need to be able to ventilate crosswise so that a draft is created. That is the be-all and end-all :)