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Guest Blogs
Comparing North American Window Frames to European Frames

Thin North American window frames with a high U-factor sometimes perform about the same as European window frames with a lower U-factor
Green Building News
Marvin to Offer Passivhaus Windows

The Minnesota company would become the second U.S. supplier of certified windows, increasing options for North American builders
Musings of an Energy Nerd
Passivhaus Windows

Cold-climate builders look for the best available windows

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Comparing North American Window Frames to European Frames