U.S. Department of Energy - Energy Efficiency and Renewable Energy

Building Technologies Office – Energy Open House

Windows

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Sealing or replacing old windows can increase savings and comfort.
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Energy Facts: During the summer, the air conditioner must work harder to cool hot rooms with single-pane or leaky windows. In winter, cold air from inefficient windows can lead to drafty, uncomfortable rooms. But contrary to popular belief, other home improvements usually have a much larger impact on energy efficiency (and faster payback) than new windows. These include improved insulation, air sealing, updated HVAC equipment, and newer ENERGY STAR® qualified appliances.

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Scout It Out: How old are your windows? Are they single pane? Do they leak? An energy auditor can provide technical advice on caulking to improve your windows' performance, and advise you on the payback period for replacement windows and storms.

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Tips:

  • To counteract window inefficiency in the short term, caulk any leaks and use curtains and shades to block drafts and the summer sun.
  • If your windows are leaky, consider replacing them with ENERGY STAR qualified windows or installing storms.