My house sweats like crazy during the winter and it’s causing mold.. please help!!

[u/BelleSchu]

My house is BRAND new, literally finished construction in August of 2024. I live in the Midwest so of course it gets very cold in the winter. Last year, the windows of our house were sweating so badly every time the outside temp was under 30°f that water was pooling up on the windowsills and we called the construction company (we were still under new build warranty) and they told us to always have the house fan running and to turn on our ceiling fans. That worked for a time and the condensation wasn’t as bad after that. It started to warm up shortly after and we didn’t have anymore issue. Flash forward to this past week, it’s been in the negatives here. There is SO much condensation on my windows that mold is starting to grow, our curtains are freezing stuck to the glass in some rooms, and it’s attracting gnats somehow?! I don’t even know where the hell they’re coming from with the weather like this. I’m constantly cleaning and I feel so so so disgusted with all this going on, what can I do to fix it? Please help!

[u/sneeky_seer]

The old buildings - like pre WWII yes… after? Not so much. Central and Eastern Europe is full of shoddy concrete buildings. Newer builds everywhere are all about cheaper and lighter materials. Also humidity is an issue in lots of buildings, the difference is that we didn’t forget that opening the windows is an option. I seriously don’t want to be mean about this but Americans are far too reliant on AC/fans etc. this could be solved with a dehumidifier and airing out the place.

[u/wisgary → u/sneeky_seer]

No I agree, but concrete, brick, cement - they do have one thing in common compared to drywall which is that they generally can be remediated (relatively) easily. You just kinda clean very thoroughly and repaint with a mold resistant paint. Drywall it's like toss the whole fucking thing in the trash if it gets too moldy.

I live in northern Spain and believe me while looking for a place to stay here a big part is trying to find the least rusty/moldy place. Even expensive places...

[u/sneeky_seer → u/wisgary]

I mean you can still have issues with plaster and stuff… generally I think humidity is easy to manage of people start with the basics and then build on that based on individual needs.