Windows and condensation

[Dilbertian]

We have the bedroom windows open pretty much all year round. Properly open in summer and warm weather, and just a crack the rest of the year unless it's freezing. They are double-glazed, and as much of the house as possible has been cavity wall insulated.

Every year from October/November, there starts to be condensation on the windows in the mornings. Sometimes there's so much we have to wipe the windowsills. It doesn't seem to make any difference whether or not we have the hearing on.

What can we do to prevent the condensation?

@Nemorth Paper towels take energy to manufacture, I'm not sure if the window vac is less green. If it stops your house getting as damp, you may need less heating in the winter.

@AnitaMani

I had a positive input ventilation system fitted last year (old, cold, damp house) and it's definitely working. It's drying out damp and I have no wet windows.

Although I did learn that new builds often gave these systems fitted as standard as they are technically 'sealed' structures so they require proper ventilation.

@AnitaMani Would you mind saying how much you paid to have the ventilation system installed pls

@Nemorth

One of my pleasures in life is getting that through draft!!
Dh panics madly when I do it unfortunately but I love it

@Sugarandtime it was £1200.