Condensation on roof windows

Hello,

The roof windows not, but they didn't even exist at that time.

I don't like to be a smartass, but in my opinion this statement is wrong. Among others, Velux has been offering these better-insulated windows for quite a few years now. With Velux, there are also no problems.

Addition:

Because I didn't want a dirt blower in the house. I have maintained ventilation systems and know what lives in the ducts after 2 to 3 years.

If that is your job, I would have—fairly speaking—expected you to mention that unwanted inhabitants are only found where maintenance intervals/filter replacements are skipped!

Kind regards

We also have a roof window that always fogs up in freezing outside temperatures. I have a small, almost silent fan for it, which then blows directly onto the glass continuously. That helps a lot. Regards, Steffi.

Here is a picture of the fan. It is sufficient..