Single and Double Hung

In double-hung units, both sashes slide vertically. Only the bottom sash slides upward in a single-hung window. Ventilation area can vary from a small crack to an opening of one-half the total glass area. Screens can be placed on the exterior or interior of the window unit. Sliding windows, such as single- or double-hung units generally have higher air leakage rates than projecting or hinged windows.

*Note: Air tight seals are of course possible in modern vinyl designs. A compression lock and seal system such as the Solar Band Series by Green Source Windows are available with R-Values as high as R10. _ The very best in the industry.

Double Hung Window
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