Both casement windows and awning windows are similar in function and design. The main difference between the two window styles is that casement windows are hinged along one the sides of the window, where awning windows have their hinges on the top. When opened, a casement window operates using a crank located on the frame at the bottom, with the pane of glass opening either to the right or left. Awning windows also operate using a crank, the pane moves away from the frame creating an opening at the bottom as the pane is raised outward. Based on their design, casement windows can open wider than awning windows allowing for more air to circulate into your home.