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Extending Window Openings for a Deep Energy Retrofit

Posted on April 26,2015 by AlexWilson in deep energy retrofit

A few weeks ago I reported on the amazing, high-tech Alpen, R-12 (center-of-glass) windows that we installed on the north and west facades of our farmhouse in Dummerston, Vermont. At that time I promised to report on the other windows we were installing on the south and east facades (windows 2.0 if you will).

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