- 1). Reduce the relative humidity (RH) of your home to between 30 and 45 percent. An RH between 30 and 45 percent will help prevent excess moisture from condensing on your windows. To lower the relative humidity of your home, consider running an air conditioner in the summer and a dehumidifier in the winter.
- 2). Open shades or draperies. Condensation often occurs on windows when shades or draperies are closed because these window treatments separate the cold glass from the warm air inside, allowing the glass to drop below the dew point temperature.
- 3). Reduce moisture-generating activities. To help repair problems with moisture forming on your windows, restrict watering of houseplants, take shorter showers and vent the clothes dryer outdoors.
- 4). Increase room ventilation. Install an exhaust fan in areas that typically generate excess moisture, including bathrooms, kitchens and laundry rooms. Moreover, open windows whenever weather permits.
- 5). Replace the glass. Opt instead for one with a higher Condensation Resistance (CR) rating. The National Fenestration Rating Council CR determines these ratings which range from 0 to 100. Condensation resistance improves as the rating rises. The American Architectural Manufacturers Association (AAMA) has its own rating, called the Condensation Resistance Factor (CRF).
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