NOVEMBER 2021
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 (NREL) found 15% average whole-building savings compared to single-pane windows.

Download Findings

• 1-page infographic

• 4-page brief

• NREL full report

View Webinar

• On-demand video

• Slides

• Q&A

Additional Resources

• Report: Secondary Glazing System (SGS) Thermal, Moisture, and Solar Performance Analysis and Validation (LBNL for NEEA, September 2020)

• Presentation: Enhancing Window Performance with Energy Efficient Attachments (AERC, May 2020)

• Presentation: Secondary Windows Products (NEEA, 2020)

• Product Search: Secondary Windows that Meet AERC Standards (AERC)