White roof shingles do exist. When I got my roof re done last year white was a color option. White roofs are more energy efficient in hot climates where summer cooling is a bigger energy expense than winter heating. If the opposite is true then a dark roof is actually more energy efficient because a dark roof helps absorb heat.
The reason white roofs are not more popular in places like the south west is really because of aesthetics. Hot dry places are dusty and white roofs are very hard to keep clean looking.
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