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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.

For starters, use the illustration below to learn the basic parts of a window (double-hung style shown here).

Window with call outs on it
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. Mounted Sweep lock for security.
6. Meeting rail (with integral interlock to eliminate drafts).
7.  Dual ventilation latches allows 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. (Click on circle.)
9. Sash
10. Double Insulating Glass, which should always have low-emissivity coating and heavier than air argon gas for optimum comfort and ENERGY STAR efficiency.
11. Lower integral lift rail (avoid mechanically attached rails).
12. Sloped sill to ensure rapid water drainage and prevent leaks..