Knowing something about windows is important if you want to make smart decisions about purchasing the right windows for your home. It's not just about  buying the right brand, but about selecting the right type of window with the most appropriate glass and options for your particular needs

1. Master frame (look for welded corners).
   
2. Upper Integral lift rail (avoid mechanically attached rails).
   
3. Internal grids (decorative option).
   
4. Fusion-welded frame and sash corners (important that both frame and sash corners are welded).
   
5. Sweep lock mounted in-shear for security.
   
6. Meeting rail (with integral interlock to eliminate drafts).
   
7. Dual ventilation latches allow window to open only to a certain point—gives you peace of mind.
   
8. Dual finger-release tilting mechanisms assure that they're easy to use and grasp.
   
9. Sash
   
10. Glass—Can be single-pane, double-insulating or triple-insulating, and should always have low-emissivity coating for optimum comfort and ENERGY STAR efficiency.
    
11. Lower integral lift rail (avoid mechanically attached rails).
    
12. Millwork on master frame to match the beauty of your home.