- Most double-hung windows have the bottom sash in front of the top sash. Each sash can be a solid pane of glass or has strips of wood or metal (called muntins) that separate and hold smaller panes of glass in the window sash. Double-hung windows typically provide the most ventilation for a house. For example, raise the bottom sash for cool air to flow inside or lower the top sash for warm air to escape at the top.
- The best uses for these windows are in traditionally styled homes and for easy-to-reach locations in the home. Windows with upper sashes that open are a safety precaution in homes with small children. Because double-hung windows do not occupy exterior space in the way that awning windows do, double-hung windows are a good choice next to walkways, porches or patios.
- An awning window has a handle that lets you easily open and shut it. Awning windows leak less air than double-hung windows because the sash of an awning window presses against the frame to close. Leave these windows open to get the benefit of cool air when it's raining because they deflect rain.
- Manufacturers suggest that the best uses for awning windows are above or below other windows or above doors and in hard-to-reach places such as above a bathtub or kitchen sink. You’ll find awning windows in use above or to the side of picture windows that don't open.
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