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Project Launch: 08/01/2021
Cross Cutting

Partners: Resource Innovations, Nicor

This project was a collaboration between utilities to assess the existing thin triple-pane window market in ComEd's service territory.


Thin triple-pane windows (TTW) are currently the most energy-efficient commercially available windows on the market; they well out-perform single- and double-pane versions in energy and cost savings. Roughly 30 percent of homes do not currently have double or triple pane windows. At 12 percent savings per home and 2 percent market share, the total market savings potential for TTW in ComEd's service territory is 14.3 GWh.

This project aimed to qualitatively estimate the market size and potential for TTW technology in ComEd's service territory. The project team also identified drivers and market barriers for thin triple-pane windows and used qualitative findings from this study to inform the scope of quantitative research in the next phase of this research. Key market actors such as manufacturers, installers, homeowners, homebuilders and more were interviewed to qualitatively assess the TTW market in ComEd’s service territory.

Results and Outcomes

Thin triple windows comprise only between 0-5 percent of installed windows in Illinois and have low awareness among market actor groups in general. All market actors interviewed highlighted that windows are often replaced with double-pane windows. TTW are generally perceived to be more expensive (10-40 percent) than standard code-compliant, double-pane windows, but in general market actors had no data or direct experience to support those perceptions. Challenges to increase the market share of TTW revolve around lack of knowledge and familiarity with TTW, lack of availability of TTW, and perceived cost of TTW when compared to standard code-compliant double-pane windows. Educating customers on the benefits of TTW and offering utility incentives for their purchase could potentially go a long way towards increasing TTW adoption.