WINDOW CONDENSATION The Learning Center Yes, in addition to condensation forming on your windows and door glass, too much humidity can cause hidden problems in your home such as peeling paint, rotting wood, shingle and roof deck durability, buckling floors, insulation deterioration, mold, mildew, and even moisture spots in ceilings and walls. Because windows generally have lower surface temperatures than other parts of your home, and because glass is impervious to moisture, condensation will tend to be visible there first. If condensation is forming on insulated glass, it is a good indicator  that the humidity is too high and could be causing damage to other parts of your home that you cannot see as easily. Determining what level of humidity is desirable, and when to add or reduce moisture, can be difficult. Research indicates that we are physically most comfortable at a relative humidity of 40 to 60 percent. However, most of our homes will not tolerate this high level of humidity over the course of the winter without suffering damage. The humidity level that should be maintained in your home during the winter varies with the outside temperature. Problem-causing condensation will usually result when indoor humidity exceeds these levels. The colder it is outside, the lower the humidity level must be inside your home. All major manufacturers of humidifiers list the recommended humidity settings based on outside temperatures. The chart to the right reveals the recommended inside relative humidity for 70º F.          11. Is there such a thing as too much humidity? < back to list of questions about window condensation Outside Temperature Indoor Relative Humidity -20º F or below -20º F to -10º F -10º F to 0º F 0º F to 10º F 10º F to 20º F 20º F to 40º F not over 15% not over 20% not over 25% not over 30% not over 35% not over 40% 1-877-SWING CLEAN info@energyswingwindows.com 3245 Miracle Drive Murrysville, PA 15668 724-387-2991 PA Contractor ID PA001856