Central ventilation system / also in the basement room?

In fact, this no longer applies to any new building and is therefore pure theory.

How about you back up your statements a bit instead of always spreading some crazy theses here? What no longer applies to any new building? Physics?

And what do you read here? There are people who have integrated their basement into the controlled residential ventilation. There are also people who place the air-water heat pump next to the terrace or constantly keep their windows tilted. You can do that, but it’s not a good idea. You have a different "opinion," fine. But if you want to discuss with me, stay polite and try using arguments :-*

I already have if you read my first post. You will hardly find a new build basement under 16 degrees. And since you constantly circulate the air, nothing can mold. Likewise, you cannot heat the unheated room more than 1 to 2 degrees with controlled residential ventilation, so the effect you described never occurs.

Controlled residential ventilation is not a hot air blower, have you ever looked at the small volumes that are moved?

I have read that, but apart from the claim that they are 16° warm even in the deepest winter, there was nothing else. The DIN EN 12831, which specifies the nominal temperature of 10° that I mentioned, was issued in September 2017 - have they missed something in the last 16 months that only you have noticed and the upcoming update will prove me wrong?
Explain to me, how can a thermally separated cellar without heating maintain 16° (or more) permanently at subzero temperatures?

And what does air circulation have to do with mold prevention? If there was any connection, wouldn’t a simple fan be the remedy of choice?

I do not understand your objection regarding controlled residential ventilation and heating. I did not write anything of the sort.

OK maybe we are talking past each other. I am referring to a basement that is 100% within the thermal envelope, as is common in new construction. There, 10 degrees is unrealistic. Also because normally some rooms are heated, the supply room is located there, and the waste heat also heats the rest.

A fan blows air from A to B. A ventilation system exchanges the air. A difference, right?

We should also talk about whether it is about winter or summer. In winter, controlled residential ventilation is absolutely positive. In summer, it is like normal airing out, the basement should only be ventilated at certain times/days.

But in summer again, it does not play a significant role whether a basement is heated or not. There is no heating running anyway.

Controlled residential ventilation and heating were mentioned in the initial post.

First of all, thanks for the stimulating discussion.

I also don’t think the basement will cool below 16°C since it is a KFW55 house and, as mentioned, the basement floor is only partly unheated. In addition, no laundry is washed or hung there.

The larger part is used for living. For understanding, here is the factory plan. White circles are supply or exhaust air. Each marked with the abbreviations "Abl." and "Zul.".

So something doesn’t fit in your planning!

The planning is actually not from me but from the installer. I am questioning it.

All rooms, as well as the hallway, are heated except for Basement 1 and the technical room. The basement side is built into the slope, therefore white tank with 120 mm WLG 038 insulation. The front is masonry with U8 42.5 as well as the rest of the house.

So actually there should be an exhaust air in the technical room and a supply air connection in Basement 1, right?

Or maybe nothing at all, opinions are rather divided.

But we will hardly ventilate actively, who thinks of that in a basement? And an open window overnight will cool down everything, which you don’t want either.

Regards Christian

Yes, that's exactly how I would do it, definitely integrate.