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I got this off amazon. Which is a proper dehumidifier. It would be too noisy to run overnight in a bedroom though, I had it running in the room where my washing was drying and it did a good job of keeping condensation out of there.
Buy a dehumidifier. My windows need replacing and I have the same issue. I leave the dehumidifier on in the hall upstairs and as long as the doors to the rooms are left open a little it works like magic to take the humidity out of the air. Our windows have gone from sopping wet in the morning to bone dry.
The humidifier I use has a humidity setting which I leave on 45 or 50. This means it will only turn on when it detects the air humidity go above that, when it's got the humidity back to a good level it will switch off. They are supposed to be quite energy efficient too so won't cost much to run.
Indoor air humidity over 60 is bad for your health due to mold spores in the air so it's a good solution to improve the air quality in the home.
This is the one I use and it works great.
EcoAir | DC12 Compact Dehumidifier | 12 Litres per Day | Electronic Control | 3.5 L Water Tank | Active Humidistat| Laundry Mode|Clean Your Filter Indicator|Auto Defrost https://www.amazon.co.uk/dp/B00HT8DC7Y/ref=cm_sw_r_apan_glt_fabc_ZA7FJ988BH398K0CXBWM?_encoding=UTF8&psc=1
I bought this one when it was £125 and about 6 years ago. EcoAir DC12 https://www.amazon.co.uk/dp/B00HT8DC7Y/ref=cm_sw_r_cp_api_i_oHOQFbNVEMMQ6?_encoding=UTF8&psc=1
Back when I lived in London our flat got super humid and kinda mouldy in places. It is fairly compact and worked really well. I’d aim the dry air vent back at the hanging clothes and they’d dry about 4x faster than before. Also the clothes I’d pull out of my drawers no longer smelled funky or felt off.
I’ve since moved and haven’t had to use it as much, but did use it when I repainted a room a year or so back, to speed up the drying time, and I lent it to a friend who had a water leak recently. It still performs really well.
£125 felt like an expensive purchase back then but within a week of owning it I couldn’t believe we hadn’t done it sooner.
I have this one and it is excellent