Casement windows are outward opening windows.
Casement windows provide a better air-tight seal and better sound insulation as compared to sliding windows. It minimizes leakage in the fenestration & Improves temperature regulation from inside out and outside in. In hot and humid regions where temperature rises to a smothering 45 degrees C in summer, it reduces the cooling loss through windows/doors, helping in the standard use of the air conditioner and maintaining the temperature, and avoiding overload and repetitive use of cooling systems.
Similarly, In cold dry climates, the casement window seals shut the warmth inside with little to no leak to the outside environment and vice versa with outside weather to the comfort of your room.
The use of double glass should be considered to achieve better sound and heat insulation.
At window world, we always use an EPDM gasket for air and water tightness with longer life.