Double-hung windows have two movable sashes that can be moved up and down, allowing ventilation at both the top and bottom. If you open both sides of a double-hung window sash halfway, it allows twice as much airflow as a single-hung window. The opening above the upper sash allows hot, unfresh air to escape, while the opening below the lower sash allows cooler, fresher air to be drawn in.
Post time: May-06-2022
