The Condensation Resistance Factor (CRF) is a measurement established by the American Architectural Manufacturers Association (AAMA) that identifies how well a window resists the formation of condensation on the inside surface of the glass. The National Fenestration Rating Council (NFRC) has a similar measurement simply called Condensation Resistance (CR), however, there are some differences in how these two values are determined.
Because of discrepancies between these two measurements, and the fact that neither one of them is quite as reliable of a measurement as the U-Factor or the Solar Heat Gain Coefficient, they don’t carry as much weight in the industry and aren’t always included on a window’s energy performance label.
Windows rated on the NFRC’s Condensation Resistance rating scale range from 1 to 100 and windows with a higher number are more resistant to condensation. Criticism of the CRF or CR as reliable measurements stems from the fact that, while they consider certain specifications of the window itself, they fail to account for other important factors that can contribute to condensation forming on the inside of a window, such as shades, curtains, blinds, or other window treatments that can affect the amount of airflow across the surface of a window. Codifying a Condensation Resistance rating is also largely contingent on the humidity levels both inside and outside of a home, which often vary from region to region.
For more information about how a replacement window’s Condensation Resistance Factor can affect your home’s energy performance, click here to locate a Sunrise Windows dealer in your area.