A single-hung window is a type of vertical sliding window that features two sashes, but only the bottom sash is operable. This means that the bottom part can be opened to allow fresh air in, while the top sash remains fixed in place. Single-hung windows are commonly used in residential buildings due to their simplicity and ease of use. These windows are typically more affordable than other window types, such as double-hung windows, which allow both sashes to move. Single-hung windows are also easier to clean since only the bottom sash can be accessed from inside the home.