Ventilation system central or decentralized

19 degrees is always in the rooms when no one is there

Is too little…

in the cellar room behind it

An apartment in the cellar? Please explain more about the situation first. Also about the house and the location of the apartment.

I don’t quite understand this

Autocorrect on phone. Should have said "and the doors…"

The apartment is not in the basement, it is a storage room, I expressed myself incorrectly.

But 19 degrees is too little, we have a maximum of 20 degrees in our apartment and that is already too warm for us.