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Efficient Windows Collaborative

Welcome to the Efficient Windows Collaborative


This site provides unbiased information on the benefits of energy-efficient windows, descriptions of how they work, and recommendations for their selection and use. The Efficient Windows Collaborative (EWC) is a nonprofit, 501(c)3 organization that partners with window, door, skylight, and component manufacturers, research organizations, federal, state and local government agencies, and others interested in expanding the market for high-efficiency fenestration products. EWC's members have made a commitment to manufacture and promote energy-efficient windows.

Selecting Windows for New Construction

Window Selection Tool

Selection Process

Design Guidance


Quick Links

Go To EWC Members


New Construction Windows

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Replacement Windows

Understanding Windows

Resources & Information

EWC Information