The Window Source of the Tri-Cities

3036 Highway 75 Kingsport, TN 37663

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423-406-8600

What Makes a Window Energy-Efficient?

Energy-Efficient Windows Begin with the Right Glass Pack.

An Insulated Glass (IG) Unit contains two or three panes of glass separated by a spacer. The IG Unit is also known as a glass pack. The glass pack contains panes of glass, warm-edge spacers, gas fill, and Low E glass coatings that all work together to improve the energy efficiency of a window.  These key elements are unpacked below.

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