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High R Value Windows

FINDINGS #07, December 2013


High performance or “Hi-R” windows use advanced technology to deliver up to a seven-fold improvement in a window’s thermal performance. At a GSA test bed location in Provo, Utah, Hi-R panel retrofits, which are installed on top of existing windows, reduced heating loads by up to 41%. Click on the infographic below to enlarge.

GPG Findings 07, December 2013, Highly Insulating Window Panel Retrofit. Opportunity: How much energy is lost through inefficient windows in commercial buildings? 23% energy used to heat and cool buildings is lost through inefficient windows. Technology: How do Hi-R Window Panel Retrofits save energy? Improve thermal performance with low-e window panels. Pre-manufactured like storm windows; simplifying installation. Measurement and Verification: Where did M and V occur? Lawrence Berkeley National Laboratory assessed the impact of Hi-R panel retrofits on heat-load reduction and employee comfort in Provo, Utah federal office building. Results: How did Hi-R Window Panel Retrofits perform in M and V? 41% heating savings in winter. Estimated savings for entire building heating and cooling: 11%. Quick installation. Improved visual and thermal comfort. Less than 9 years payback for triple-pane; double pane will be shorter. Deployment: Where does M and V recommend deploying Hi-R Window Panel Retrofits? Buildings in cold climates with single-pane windows. Double-pane retrofits recommended, as triple-pane offers diminishing returns. Site-specific evaluation is critical.

Reference above to any specific commercial product, process or service does not constitute or imply its endorsement, recommendation or favoring by the United States Government or any agency thereof.



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