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That heat is then transferred to the old stone walls underneath. From there, the stone slowly radiates the warmth into the interior, keeping it around 70°F even as night temperatures drop to 25°F. A wood-burning stove compensates for cloudy days. (For the thermally-savvy, the polycarbonate has a U value of 1.1 W/m²K).  Photo 4 of 6 in Guess Which Humble Material Made This 100-Year-Old Building Super Energy-Efficient
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