Basement as a white tank - heating?!

Is it possible to connect the basement to the controlled residential ventilation unit without heating it? So a utility basement, outside the thermal envelope, with central ventilation? Theoretically, you would then have to bypass the heat recovery. Then you would save the operation of the dehumidifier and still have fresh air. However, with controlled residential ventilation bypassing the heat recovery, you would probably need two different circuits because the living space and basement have different requirements regarding the dew point. An alternative might then be decentralized ventilation systems that can be controlled by the dew point, right? Two of them installed in the basement. But then you would mix central and decentralized again. Or is it all nonsense?

Our landlords had this brilliant idea with the basement outside the thermal envelope too (before the house was built) ... end of the story: always cold, always damp, they covered the costs for the dehumidifier and we fools had to empty it constantly ... neither a fan to the outside (decentralized) nor any expensive climate boards could solve the problem ... shoes in boxes all got moldy ... Why do you want to do that?

Is it possible to connect the basement to the controlled residential ventilation system without heating it?

So a usable basement, outside the thermal envelope, with central ventilation?
In theory, you would then have to bypass the heat recovery.

Then you would save the operation of the dehumidifier and still have fresh air.
With a controlled residential ventilation system bypassing the heat recovery, you would probably need two different circuits, because the living area and basement have different requirements regarding the dew point.

An alternative might be decentralized ventilation systems that can be controlled according to the dew point, right? Two of those installed in the basement.
But then you would mix central and decentralized again.

Or is all of this nonsense?

Could you please explain the heat recovery again? Is this about the temperature difference due to the colder air in the basement?

Simply connect the basement rooms to the [Kontrollierte-Wohnraumlüftung] and that's it. There isn't really a huge temperature difference there anyway.

Just connect the basement rooms to the controlled residential ventilation and that's it. There isn't a huge temperature difference there anyway.

Outside the thermal envelope, yes ....

Short contribution on this.

There are two important points:

1) What kind of [WU Keller] do I get according to the contract? There are also manufacturing methods that allow temporary water ingress. Then I even have a damp basement from the outside and that is legal.
2) [WU] and indoor climate have hardly any connection, except that of course there is no fresh air supply and no diffusion to the outside can take place.
Therefore, the basement should be insulated and climatized, meaning heated and ventilated, regardless of whether it is [WU] or not. The method is another question.
Since an uninsulated basement will be cold, moisture will form on the surface and this can often lead to mold and mildew formation on clothing and boxes.

There is a leaflet that divides [WU Keller] into different categories of use and then provides recommendations in various A** categories.

Further note regarding the contract: Agree on [DBV Merkblatt Wasserundurchlässige aus Stahlbeton] and define a usage class (here it would be A).

Then derive the climate question from that. If you really want to use it, it belongs integrated into the thermal envelope.