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flskimboarder592 t1_j6jf4tg wrote

You say take the humidity out of the room. My whole house has a humidifier connected to it that I turn on in the winter. I know the air in winter is much drier and the reason for this is to help with dry air and shrinking. When I add humidity to the air and get these cold snaps, the same thing happens.

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ImmortanSteve t1_j6jp6z0 wrote

The colder it is outside, the lower the humidity needs to be inside to stay above the dew point and avoid condensation. Basic whole house humidifiers just have a % humidity setting which can cause problems when temperatures fall as you mentioned. There are nicer controllers that also measure outside air temperature and automatically reduce humidity when it gets colder outside. Talk to your HVAC professional about this.

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flskimboarder592 t1_j6jxanq wrote

Right and mine had the % setting and my HVAC tec said I could lower it but give it 3-5 days to see results. In St Louis we don’t get super cold air that causes this all the time so by the time that waiting is up it’s back to not having condensation.

During that attic air when it felt like -20 outside I actually had water freezing on the inside of the window.

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BdaBng t1_j6jpz2l wrote

Dehumidifier will work but only if you drop the humidity level far enough in the house which is miserable yo live in. But like you said that completely goes against the whole point of adding humidity in the house for comfort. Even high end windows can suffer from this when temps drop. Generally double hung windows get it worse than casement windows.

One thing that can help is to get air movement against the windows. If you have curtains keep them closed at night but open them for a while during the day and see if it helps clear it up. Otherwise a quick wipe with a towel is the quick solution.

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