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He covered the south-facing facade with 8 layers of polycarbonate plastic, in total about 3 inches thick. During winter, the sun is nearly perpendicular to the facade, beaming its energy directly into all its layers. The polycarbonate can reach 130°F even as outside temperatures peak at 50°F. Guess Which Humble Material Made This 100-Year-Old Building Super Energy-Efficient - Photo 3 of 6
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