Too high humidity in the apartment. 60-70% in winter

What does "vor kurzem" mean? How long have you been living there after the painting?

A little more heating and shock ventilation
Mold prefers it a bit cooler

The ideal tenant keeps the room temperature at at least 25 degrees and ventilates 5 times a day. You are far from that if you report this to the landlord. Is it the north side where it fogs up?

Hi,

thanks for the numerous responses.

We have been living here since December. The windows face north and northwest.

As an example:
Just now the temperature in the bedroom was 19.1 degrees and the humidity 59.2%. I ventilated and the humidity dropped to 42.3% at 18.1 degrees and then rose again within 5 minutes to 57% and then rises more slowly.

By the way, I would say that in all rooms except the bedroom the temperature is about the same, so there is no difference between the kitchen, living room, and study.

In my opinion, it cannot be normal that the humidity rises so quickly again? I think that our heating and ventilation habits are basically completely fine and correspond to common recommendations.

Perhaps one more thing my girlfriend just pointed out: After painting, the apartment apparently stood empty for almost 2 months and was probably hardly/ irregularly heated and ventilated (October - December).

Best regards
BPE

Hi, measure all walls and floors every 50cm with a moisture meter. Such values are not normal, I am sure you will find something.

Even if an unoccupied apartment is not heated, the values are not normal