Resources

The National Fenestration Rating Council (NFRC) The nation's recognized organization for measuring and evaluating window energy performance. For more information about NFRC, visit them at www.nfrc.org.

The Northwest Energy Efficiency Alliance is a nonprofit group of electric utilities, state governments, public interest groups, and industry representatives committed to bringing affordable energy efficient products and services to the marketplace.

Part of the Alliance to Save Energy, the Efficient Windows Collaborative works with the window industry and the Department of Energy's laboratories. For more information about the Efficient Windows Collaborative, visit them at www.efficientwindows.org.

Visit the ENERGY STAR Web site at www.energystar.gov.

Following is a list of useful Web sites focusing on energy efficient windows:

• Lawrence Berkeley National Laboratory
• National Renewable Energy Laboratory Center for Buildings and Thermal Energy Systems
• American Architectural Manufacturers Association