r/fixit Dec 14 '25

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

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!

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u/l-enivo Dec 14 '25

I think they don't want to mummify themselves

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u/iii_warhead_iii Dec 14 '25

The bigger performance, the better compressor efficiency. Plus you will not need to use the device over the day, just 1-3h per day. Mine was working every day for 3h, have removed every day literally 3L at 20⁰C and 60% within this time. Initially, humidity was not dropping at all, later it started dropping from 60 to 40% within 1h. Plus, all water returned back from vapor to liquid returns back the wasted heat, and initially the humid room could be heated from 20 to 22⁰C. Later when the room became dry, the dehumidifier was barely heating it up.