Demonstration and Evaluation of Lightweight High Performance Quad-Pane Windows

Research output: NRELTechnical Report


Ten high-performance quad-pane windows (five quad-pane with suspended film and five quad-pane with thin glass) were installed at Building 41 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 replacing 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 quad-pane windows for GSA applications. Some of these assessments were performed with models, while others required onsite evaluations including time series measurements.
Original languageAmerican English
Number of pages69
StatePublished - 2021

NREL Publication Number

  • NREL/TP-5R00-79107


  • buildings
  • FEMP
  • General Services Administration
  • GSA
  • quad-pane
  • thermal performance
  • windows


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