What type of window has two operable sashes that move?

The type of window that features two operable sashes that move is the double-hung window. This design allows both the top and bottom sashes to open, providing versatility in ventilation options. Homeowners appreciate this feature because it enables them to control airflow effectively—cool air can enter from the bottom while warm air can escape from the top. The presence of two movable sashes distinguishes double-hung windows from other types, such as casement windows, which hinge on one side and swing outward, or picture windows, which are fixed and do not open at all. Sliding windows also differ, as they typically consist of one or more sashes that slide horizontally rather than moving vertically. The double-hung window design is popular in various architectural styles and offers a classic look along with practical function.