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Which type of roof is best in cold climates: solar, white or green?

from Treehugger

There are a variety of ways to make your building more sustainable and energy efficient, but the most discussed area to improve is the roof. For years, we've heard about the benefits of white roofs, green roofs and roofs covered in solar panels, but depending on the building and where it's located, one of these types may make a bigger impact than another. more

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