According to Energy.Gov windows come in a number of
different frame and glazing types. By combining an energy-efficient frame
choice with a glazing type tailored to your climate and application, you can
customize each of your home’s windows.
TYPES OF WINDOW FRAMES
Improving the thermal resistance of the frame can contribute
to a window's overall energy efficiency, particularly its U-factor. There are
advantages and disadvantages to all types of frame materials, but vinyl, wood,
fiberglass, and some composite frame materials provide greater thermal
resistance than metal.
More on window types and uses.....
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