What Goes Into an Energy Star Window?

Installing new or replacement Energy Star windows is one of the best ways to make your home energy-efficient - and, through the end of 2007, you can get federal tax credits too.

In order to get the Energy Star label, windows must meet stringent specifications determined by the Department of Energy. Also, they must be certified by the National Fenestration Rating Council, which rates the entire window system, not just the glass, on its energy efficiency.

While specifics will vary from window to window, Energy Star windows offer features including:

• Low-E coatings - microscopic coatings on the glass that help keep out the summer heat and winter cold by reflecting infrared light.
• Double- or triple-pane glass - multiple panes of glass, separated by air or inert gas, which do a much more effective job of insulation than a single pane.
• Argon or krypton - used instead of air between a window's panes, these inert, nontoxic gases offer superior insulation properties.
• Warm edge spacers - made of foam, steel, fiberglass or vinyl, they keep the panes separated the correct distance to ensure good insulation.
• Frame materials such as wood composite, vinyl, or fiberglass - they reduce heat transfer and offer better insulation.

Energy Star windows are available in lots of styles from many window manufacturers, offering the right aesthetics and features for your home, whether it's on the beach, in a sunny valley, or in snow country. When you're ready to begin your search, our experts are ready to help.

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