White roofs are greatest, reflecting from sixty to ninety % of daylight, according to the Department of Vitality. But you also can buy a "cool coloured" roof: a darker roof that employs specialized pigments that reflect about 30 to 60 percent of sunlight. (Check out the DOE’s Power Saver site https://maps.google.com/url?q=https://www.advancedroofing.biz/location/