Helpful Ideas:

Selecting New Windows
Home Improvement Tips
How to Install Windows
Energy Star Benefits

Fenestration Industry Links

National Fenestration Rating Council

Efficient Windows Collaborative

U.S. Department of Energy

Energy Star

Alliance to Save Energy

Window and Door
Manufacturers Association

National Sash & Door
Jobbers Association

Center for Energy Efficiency
and Renewable Energy
Umass Fenestration Research Page

Lawrence Berkeley National Laboratory

Forest Products Society

National Technical Information Service


National Renewable Energy
Laboratory for Buildings 
and Thermal Energy Systems

American Wood Fibers

American Forest & Paper Association

State Energy Codes

National Association 
of Home Builders

Western Wood 
Products Association

Center for Sustainable
Building Research