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Energy Savings Potential and Cost-Effectiveness Analysis of High Efficiency Windows in California

The focus of this project was on insulated, multi-pane windows with gas fill and passive coatings to control heat and solar gains. The high efficiency options were analyzed in detail to determine their technological, cost, and market readiness. Time Dependent Valuation (TDV) regulated energy savings for each option in each California climate zone was modeled in accordance with Title 24, Part 6 using the California Building Energy Code Compliance (CBECC-Res) software and California Energy Commission approved methods for evaluating potential new code requirements. While the results suggest that none of the high efficiency options are ready for broad deployment in California with the current cost structure, there may still be opportunities for utilities and others to significantly lower the installed cost of high efficiency windows by stimulating demand through financial incentives and education about non-energy benefits.

Original Publication Date: May 21, 2018

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