U.S. General Services Administration
Report
- 4-page brief [PDF - 654 KB]
- Full report [PDF - 3 MB]
- Full-size infographic for downloading
Lightweight Secondary Windows
Compared to window replacements, secondary windows are a cost-effective and efficient way to improve thermal performance and occupant comfort and reduce noise.
Researchers from the National Renewable Energy Laboratory found 15% average whole-building savings compared to single-pane windows.
Reference above to any specific commercial product, process or service does not constitute or imply its endorsement, recommendation or favoring by the United States Government or any agency thereof.