End-Use Savings Shapes Measure Documentation: Window Film

Summary

The National Renewable Energy Laboratory (NREL) conducted a study, documented in NREL/TP-5500-86554, on the energy saving potential of window film retrofits in U.S. commercial buildings, using the ComStock™ model calibrated to the 2018 building stock. The study found that window film application can improve window U-factors by 0-22% and solar heat gain coefficients (SHGC) by 17-71%. While beneficial for reducing cooling loads in hot climates, the overall aggregated national site energy savings were calculated to be 0.25%. Window films were specifically not applied to double pane windows in climate zones 7 and 8. The report provides detailed insights into energy savings by end-use and climate zone, highlighting the balance between reducing solar heat gain in summer and potentially increasing heating loads in winter.

Key Facts

Source Document

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