Efficient Windows Collaborative (EWC) members have made a commitment to manufacture and promote energy-efficient windows. This site provides unbiased information on the benefits of energy-efficient windows, descriptions of how they work, and recommendations for their selection and use. Take a look to learn more!


We are working on updating all the information on this web site to reflect the new 2010 ENERGY STAR requirements. Currently the Window Selection Tool has yet to be updated. Please check back with us soon.

  • State fact sheets reflecting the new 2010 ENERGY STAR requirements are now available. View now»
  • EWC Tax Credit InfoThanks to the stimulus bill, homeowners can now claim a tax credit of up to $1,500 for new, energy-efficient windows, doors, and skylights. More Information»
  • The fall edition of the EWC newsletter, Word on Windows, is now available. View now»
  • As energy prices increase and school budgets tighten, school districts are looking for cost-effective ways to improve building energy efficiency and operation. Download Tools for Schools»
  • Steve Selkowitz, head of the Building Technologies Department at Lawrence Berkeley National Laboratory speaks on"Energy-Saving Windows A Legacy Of '70s Oil Crisis" on National Public Radio (NPR). Listen now»
  • Let utilities help you finance more energy-efficient windows for your home. Download an overview of Utility Programs that Offer Incentives and Rebates for Energy-Efficient Windows»

Efficient Windows Collaborative

This site is sponsored by the EWC with support from the U.S. Department of Energy's Windows and Glazings Program
and the participation of industry members.

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