Casement windows are a popular choice due to their functionality and design. They are highly efficient for ventilation, allowing maximum airflow when fully opened. The outward swing of the sash can help capture breezes and direct air into the home, making them ideal for areas where you want to maximize ventilation. The roto-gear and crank mechanism also allows for easy operation and provides a tight seal when closed, contributing to better energy efficiency. Additionally, casement windows can offer unobstructed views and are available in various materials and finishes to suit different architectural styles.