Sweaty Windows!.. Listen for some suggestions that might help with windows sweating in the winter | Tips
Today's Homeowner Podcast - A podcast by Danny Lipford

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Good condensation VS Bad condensation. If condensation forms on the outside of your window, that’s a good thing. It means the window is doing its job. But if condensation forms on the inside, you have a problem. It usually means outside air is somehow migrating inside or humidity levels inside are just too high. To help combat this moisture, seal any gaps and cracks surrounding the insulated window using a good quality acrylic latex caulk. Be sure to use ventilation fans in bathrooms and kitchens. And, if needed, use a dehumidifier to lower indoor humidity. The ideal range you want inside is between 35% and 50%.