A few companies offer windows with foam-filled frames, does this really increase energy efficiency?
Yes, foam-filled frames will increase the efficiency of windows, but only if you live up north. Filling vinyl window frames with foam will only trap in heat, which is not what homeowners want down in the south. In the South, homeowners want window frames that allow the air to circulate and cool itself like a radiator, which is only found in hollow frames. In other words, foam-filled frames will actually degrade the windows SHGC (solar heat gain coefficient) rating by retaining heat.
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