Unlike double-hung windows, single-hung windows feature a fixed top sash that does not move or tilt inwards, although the bottom is operable. Single-hung window cost less and are far more common, especially in older homes and buildings, than double-hung windows, although they are harder to clean and maintain. The amount of space between the lower panel and the bottom frame limits the ventilation control offered by single-hung windows.
Single-hung windows are about 10 to 25 percent cheaper than double-hung options, and are often cheaper to repair. These windows are also easier to install than double-hung windows due to their reduced weight and limited number of moving parts. Single-hung windows are the most common type of window installed but are beginning to decline in popularity with more modern homes and construction.
Both types of windows are available in a wide range of materials and styles suitable for all kinds of architectural designs. Double-hung windows are typically available in a slightly wider variety of options due to their higher cost. Single-hung windows are more challenging to clean, especially those installed on upper floors. This is because the bottom window panel partially covers the top pane when the window is opened. Single-hung windows provide superior energy efficiency due to their immovable panel.