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Have always had white colored cars to help keep the interior cooler (although the portion of the interior heating due to the greenhouse effect through the windows is unaffected by car color). Recently whitewashed the roof on my house, which resulted in a noticeable reduction in A/C and attic fan operation running and making it possible to work on the roof in the middle of the day without getting a hot foot or burning up from all the heat radiating up from the shingles. Another advantage of having a white surface is it reduces the surface temperature change from day to night, which should increase the life of the paint or roofing material since it is not being as thermally stressed.
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