When you compare one window to the next, you’ll see – and feel – the quality difference. Our manufacturer’s windows begin with a computer-controlled construction of the mainframe and steel-reinforced sash to produce a solidly built window with superior strength. Most windows come standard with double-strength glass for an exceptionally strong barrier. Interlocking meeting rails and thickset multi-chambered extrusions further add to the structural integrity and insulation, while multi-layer weatherstripping, a compression bulb seal and drop-in glazing provide excellent thermal protection. You’ll also want to test the window’s moving parts. Our manufacturer’s Double-Hung Windows, for example, feature a full interlock at the meeting rails to seal the window tightly shut and a constant force balance system to ensure smooth and easy operation of the moving sash.