Casement windows have hinges on their sides. They normally have a lower amount of air leakage than sliding windows because their sashes when closed press against the frame. When opened, casement windows project outward. This provides considerably
better air circulation than windows that slid of the same size.

When to Use a Casement Window:
Architectural style: With the contemporary look that casement windows have, they are perfect for the Prairie, Tudor, French, Ranch, and Contemporary architectural style home or building.

Vision:
You will have an unobstructed view with casement windows.

Ventilation:
Casement windows provide considerably better air circulation than windows that slid of the same size.

Convenience:
Casement windows crank open, so you dont have to push or lift.