Which of the following is true regarding double-hung windows?

Double-hung windows are designed with two sashes that slide vertically within the frame, allowing for both the upper and lower sashes to be opened and closed. This design provides flexibility in ventilation, as both sashes can operate independently. Homeowners can choose to open just the upper sash for ventilation while maintaining privacy or to open the lower sash for a direct airflow.

The ability for both sashes to operate is a significant advantage when it comes to natural air circulation, making double-hung windows a popular choice in residential construction. This operational design is particularly useful in various weather conditions, as it allows for effective air exchange without compromising safety or comfort.

Options suggesting that only one sash operates or that neither sash can operate do not reflect the typical functionality of double-hung windows. This understanding of operation is key for anyone involved in home improvement contracting, as it impacts design choices, installation practices, and client recommendations.