Building a single-family house in NRW

Objectively, it works without Controlled Residential Ventilation, with it is more comfortable and the ventilation is ensured. Whoever wants it or can afford it, good. But the feeling inside me is that Controlled Residential Ventilation owners are like a kind of New Jehovah's Witnesses faction, or Scientology with a fan attachment. And then it resists inside me. The little devil, the little evil Karsten demon, he simply does not want to be converted. So, you kwlers, less missionizing, more simply, I am satisfied with my Controlled Residential Ventilation. I would buy it again. Period, end, enough. Karsten

I certainly do not air out every day 5 times for 3-5 minutes and I also do not have any mold. So some things here are really preposterous. I have only 11 windows, but why the hell should I open and close every window 5 times a day? And the windows that need airing, I air out when I happen to be nearby anyway. So at most 5 minutes a day are spent "extra" on airing out. And not even that.

Objectively, it is possible without controlled residential ventilation, but with it, it is more comfortable and ventilation is assured. Whoever wants it or can afford it, good.

I certainly don’t ventilate 5 times a day for 3-5 minutes each and I don’t have any mold.

On the one hand, we want and have to build increasingly energy-efficiently and often pay attention to the smallest leaks with door blower tests; on the other hand, we tear square-meter-sized holes / preferably cross-ventilate / to send cubic meters of heat out of the house.

The comfort aspect is one thing; but a cleanly thought-out, energy-efficient building also has to ensure air exchange without letting all the nice energy escape.

And that works quite well when you have controlled residential ventilation with heat recovery.

But not if you have to choose controlled residential ventilation or money for garden landscaping. If it is and, okay. With or I choose the garden. Karsten

Now it gets interesting.... you know, about energy efficiency and stuff. How many watts does a [Kontrollierte-Wohnraumlüftung] have?

Open 22 windows on two levels, wait 3-5 minutes; close 22 windows

Well, I don't know your building conditions now, but our goal when ventilating is not to have EVERY single window opened five times a day... It's enough just to ventilate by opening windows on two sides of the house and moving on.