The Window Source Atlanta had the pleasure of replacing 9 windows on this Lawrenceville, GA home. The customer wanted to break up the project and start with the front 9 windows and chose the 6000 Series. Our 6000 Series windows are double-hung with double pane glass. Double Pane glass on all TWS windows come filled with Argon Gas and coated with LowE. When upgrading from single pane windows, Energy Star rated double pane windows can save Metro Atlanta homeowners an average of $40 per month on utility cost. Start saving with engird efficient windows from The Window Source Atlanta.