Why does condensation occur?
Condensation (water vapor or moisture in the air) is a sign of excess humidity inside the home. Condensation occurs when moist air comes in contact with the colder surface of a window or mirror. Although the surface of the windows may be the first place you notice condensation forming, the windows are not the problem. The windows merely provide a visible sign that excess humidity or moisture is present in the house. Warm air holds more moisture than cool air. And when that warm, moist air comes in contact with a cooler surface, the moisture in the warm air transfers to the cooler surface as condensation.
