Now that the temperature outside has dropped, the windows start to accumulate water vapor. I am assuming that it might also lead to that black stuff forming. Is there a more efficient way of dealing with the condensate than wiping it dry every day?
this post was submitted on 01 Dec 2023
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Ah, my bad. I meant the silicone sealant of the glass pane where it meets the frame. The regular seal - while originally bad - has been fixed already. So it's really the seal where the glass pane meets the movable window frame, not where the movable frame meets the frame fixed to the walls, if that makes sense.
A picture should explain this better. Middle of the pane is difficult to measure in Infrared, but a regular probe taped to it shows about 18°C right now, so just a bit below room temperature. I assumed this behaviour is normal, since all windows in my rental are like this. Note that this windows specifically has not been resealed at the movable part of the frame yet. However, as you can see, it's not the coldest point of the entire window either. Outside temperature was -3°C when the photo was taken.
Thanks for the feedback! So, bad windows in my case. Either way, badly insulated windows just tend to form condensation it seems.
I guess in the end it's the usual: Regular short cross-venting and wiping off moisture - or go on an insane money spending spree on insulation and air conditioning.