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!

  • 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»
  • A multiple benefits fact sheet is now available which combines several measurable attributes (annual energy cost, peak demand, winter and summer thermal comfort, and condensation) to assist in the window selection process. View 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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