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Windows, Doors and Skylights

Key Features

An ENERGY STAR qualified window, door or skylight will have many of the following features:

• double or triple glazing with a sealed insulating glass unit;
• low emissivity or "low-e" glass;
• inert gas such as argon or krypton in the sealed unit;
• low conductivity or "warm edge" spacer bars;
• insulated frames, sashes and door cores
• good airtightness

All ENERGY STAR qualified windows, doors and skylights have been certified by an independent accredited agency for their quality and energy performance. Because of this, manufacturers often offer longer warranties for these products.