The other day when the temperature dropped my sons double glazed windows at the back of the house we're covered in condensation in the morning
I turned the heating up a degree
And made sure the curtains were left open
And the next day and ever since no more condensation
We do have a humidifier which I also used during the day for the first couple of days
It's been downstairs since drying washing
I also bought from Lidl the other day a window Vacuum £20 which I'll use if it happens again. They have these in stock still