Demonstration and Evaluation of Lightweight High Performance Secondary Windows

Research output: NRELTechnical Report


Eight secondary windows (single-pane and double-pane) were installed at Building 53 of the Denver Federal Center in Colorado as part of a demonstration project to assess their thermal performance, life cycle costs, and deployment potential for use in conjunction with existing, older single-pane windows. The U.S. Department of Energy's National Renewable Energy Laboratory performed several different evaluations to assess the viability of the secondary windows for GSA applications. Some assessments were performed with models, while others required onsite evaluations including time series measurements.
Original languageAmerican English
Number of pages78
StatePublished - 2021

NREL Publication Number

  • NREL/TP-5R00-79112


  • buildings
  • Federal Energy Management Program
  • General Services Administration
  • thermal performance
  • windows


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