Pella® Defender Series™ Vinyl Single-Hung Window

The difference between single-hung and double-hung windows is the number of sashes that move. A single-hung window has one fixed, or non-operable, sash and one operable, or moveable, sash. A double-hung window has two operable, or moveable, sashes.

It depends on why you are replacing windows. If a window is not functioning properly or is broken, it might be best to replace only that window. If you are looking to improve your home’s energy efficiency, update the entire look or reduce noise, replacing your windows all at once will likely achieve those goals more quickly and cost-effectively.

It depends on the quality and type of material the window is made of, the local climate and weather events, how well the window was installed, how often the window is opened, how often maintenance is performed and more.