ᐅ Condensation on the windows in the morning

Hi,

I live in a house that is about 25 years old and I’m wondering why the bedroom windows are always so damp in the morning during freezing temperatures? Is this normal? I air the room every evening and morning, and currently only one person sleeps in there. The room is also heated. I have no idea how to prevent this. Is the room too well insulated? Are the windows just too old now?

Thanks for your input.

Quite simple physics. Warm air can hold more moisture than cold air. Your warm indoor air meets cold window panes.
In a 25-year-old house, this is quite common. The windows are also no longer up to current standards.
The humidity level in your room is simply too high. You might consider getting a hygrometer to measure the moisture. A value between 40-50% is acceptable.
There are window heating solutions for this issue, but with a properly adjusted heating system and appropriate ventilation, it should also be manageable.

Inside in old buildings, outside in new buildings. That’s how it is. Always.

Someone once told me to be glad that the condensation is happening on the window and not on the wall.

In principle, you should urgently buy a measuring device and develop a ventilation plan, then stick to it. Of course, it will take a few weeks for the indoor humidity to decrease, but it will get better then.

Bookstar schrieb:

Inside in old buildings, outside in new buildings. That's just how it is. Always.

Yes and no. The older the historic building, the less of an issue this becomes. In our case, we have double-glazed windows about 15 years old installed in a 1920s building, but from the basement to the attic, there are quite a few (un)discovered leaks that would fail any blower door test. Not energy-efficient by modern standards. However, we NEVER have problems with fogged windows in winter.

Getting up twice at night to ventilate, then it stops (no longer).