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Single hung Window The single-hung window consists of a single pane of glass that covers the entire window space and does not move. Consequently, the single-hung window is sometimes called a fixed window. Single-hung windows are available in both new construction or replacement window styles. The chief advantage of the fixed window is that it limits air intrusion, since there are no seams that must be blocked with window seals.

The Double-Hung window is the most common style of window available. Most likely, you have seen a double hung window and not even known what it was called: it consists of two window sashes (i.e., panes of glass), one on top, one on the bottom. Many homeowners like double hung windows because they are very good at inhibiting air intrustion into the house, and because this style has a classic appearance. Also, because the style is so popular, window manufacturers and installation companies tend to price double-hungs competitively.