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Both the Florida Solar Energy Center and the federal government have done tests and released the results on the net that show that white roofs save considerable energy in areas with high air conditioning requirements over any other color. These same studies show that white asphalt shingles, while performing better than other color shingles, still perform much worse than white metal or tile roofs.
Also, tests by the Florida Solar Energy Center show that properly installed radiant barriers on the underside of the roof do considerably reduce attic temperatures. But they still recommend at least R-19 insulation installed above the ceilings.
The Florida Solar Energy Center is funded by the state of Florida and may be a direct government organization.
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