Proper ventilation behavior without controlled residential ventilation

You have windows that are not airtight "Fensterfalzlüftung". That is similar to old buildings with double-glazed wooden windows, where you could open each pane individually. Wind passes through and there is always air exchange. So these "holes" ventilate for you and you don't have to ventilate as much yourself. It's basically like a controlled residential ventilation system but without heat recovery. So energetically it's not really that efficient....

You have windows that are not airtight "window rebate ventilation". This is similar to old buildings with double-glazed wooden windows where you could open each pane individually. Wind comes through and there is always an air exchange. So these "holes" ventilate for you, and you don't have to ventilate as much yourself. It's basically like a controlled residential ventilation system but without heat recovery. So energetically not very efficient....

Energetically maybe not, but economically sensible.

You often read that proper ventilation means OPENING all windows AT LEAST three times a day, airing out thoroughly for ten minutes, etc., to release moisture. Now, the thing is, in our house (timber frame construction, everything dry, and windows with window rebate ventilation) we have a hygrometer in every room showing between 40 and 50 percent humidity.
I believe I can save myself the multiple forced ventilations, right? It should be enough once in the morning after sleeping and after showering or whenever there's a smell of food, right?

I can confirm something similar. After the first year in the solid house, when the level settled somewhat, we were also able to reduce ventilation. Now we ventilate thoroughly upstairs in the morning and in the evening in the children's and bedrooms to slightly lower the temperature. In the upstairs bathroom depending on showering habits.
In the basement, ventilation also sometimes happens in the morning. The rest happens through the door/terrace door.

Everything else is regulated by the window rebate ventilation.
For all proponents of controlled residential ventilation: unlike the leaky windows in old buildings, nothing drafts in our house, even if you sit directly in front of them. The only disadvantage I have noticed with the window rebate ventilations is ice formation at the air outlet points during extreme cold (below -10°) when the outside air immediately condenses and the water freezes.

There is absolutely nothing against window rebate ventilation, it works wonderfully, it’s just not controlled and therefore does not have the advantages of a controlled residential ventilation system... Whether those are important to someone or not is another matter... (constant top air quality without extra ventilation, adjusting the air volume according to demand and thus controlled regulation of humidity, etc., ... energy efficiency, sound insulation since there are no "holes" in the windows, incoming air is preheated in winter and precooled in summer, ...).

It’s just comfort, definitely not necessary. If someone does not see the advantages as advantages for themselves... then they simply don’t buy one, that’s that... Personally, I consider my controlled residential ventilation system one of the best investments I have ever made.

I agree, I have an unsettled digestion, need to fart a lot, and in the bedroom in the morning there is not a tiger cage but pleasantly fresh air. Wife also happy.

I see it the same way, I have an unsettled digestion, have to fart a lot, and in the bedroom in the morning there is not a tiger cage but pleasantly fresh air. Wife also happy.

A proper enema would have been better.