Both casement and top hung windows belong to the family of awning windows that swing outwards, creating maximum ventilation and natural light. The difference between the two is in their opening mechanism. Casement windows open outwards from the side with hinges located on the left or right while top hung windows open outwards from the top with hinges positioned at the bottom. Casement windows provide an unobstructed view, are energy-efficient and excellent for large openings. On the other hand, top hung windows are suitable for rooms with limited wall space and are ideal for ventilation.