A casement window is hinged at the side and opens outward like a door. It looks like a picture window. Screens are placed on the inside of the window, where they’re more protected from the elements. They are the second most energy-efficient, after fixed-pane windows. The window sash presses against the frame on closing, creating an airtight seal. This helps prevent air entry and leakage. Casement windows are wide open from top to bottom and side-to-side providing excellent natural ventilation and light. Casement windows use a strong hook to lock. No one can slip a pry bar into the sash, and the hook can’t be easily broken. They increase the security of your home, helping to keep your family and your valuables safe.