These two windows are the same except for what is inside the vinyl frames. The frame on the left is hollow, while the frame on the right is filled with insulating foam. The units have the same insulated glazing unit, a superwindow with R-9 center of glass. The hollow window frame allows air to circulate inside the frame; this convective effect is observed by noticing the frame temperatures are cooler at the bottom than at the top. The foam-filled window doesn't show this effect. These windows are being cooled on the back side with wind at -15°C (5°F)

Foam insulated window frames, give a higher thermal efficiency over hallow frames, when cured within the foam millions of small air pockets are created, significantly improving, thermal, and sound efficiency. For years people use polyurethane foam for numerous thermal applications, today polyurethane foam can be found in Steel and fiberglass doors, walls, attic insulation, pretty much anywhere an airspace needs insulation. Panes Window Manufacturing uses only USDA (United States Department of Agriculture) certified organic foam, safe, odorless, and highest performance available on the market today.

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