3 Panel Sliding Glass Doors from The Window Source Atlanta are a great energy efficient upgrade. This sliding patio door replaced a drafty metal sliding glass door from the 1970’s. The old sliding glass door was single pane and very┬ácostly on the energy bills for this customer. Old single pane sliding glass doors can let in tremendous amounts of heat during the summer, making cooling of a single room almost impossible. Now this customer can enjoy lower energy bills and a beautiful new sliding glass door.

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