Windows are one of the most high-tech products in residential construction. Since the early 1980s, the energy performance of typical windows has increased by more than 50 percent, the result of both improvements in glazing and in frame construction.
The National Fenestration Rating Council (NFRC) publishes the energy performance of certified window products, and in some states manufacturers are required to label their windows with the NFRC’s rating. These ratings are like the EPA mileage rating for cars—they may not provide actual energy consumption in a particular application, but are useful for comparison.
Products in Windows
Quanta Technologies, Inc.
American Bird Conservancy
Alpen High Performance Products, LLC
Better Than Ever Window Preservation
Bieber Architectural Windows
Cascadia Windows and Doors