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Interior Windows frosting

frostywindows's Avatar

Join Date: Oct 2012
Posts: 1

10-11-12, 11:14 AM   #1  
Interior Windows frosting

double pain double insulated windows. Is it normal for them to frost up inside the house at indoor temps of around 60 degrees and outside temps of 32 degrees? Curtain covering window. It frosts at the bottom of the window.

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Gunguy45's Avatar
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Join Date: Dec 2007
Posts: 20,655

10-11-12, 11:44 AM   #2  
Yes...very common.....it's caused by high indoor humidity and lack of airflow across the windows.

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XSleeper's Avatar
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Join Date: Dec 2004
Posts: 19,295

10-11-12, 03:11 PM   #3  
I agree. The fact that the curtains are pulled will make the window even colder and more prone to sweat. The entire glass perimeter is susceptible to sweating, but the bottoms of the windows are usually colder due to the way convection around the glass works- cold air drops along the face of the glass... while the trim and window edges block warm rising air currents.

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