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because of the low hight of the peek of your roof (18") I still think you are going to be best off insulating your attic space, and even adding normal non powered roof vents, $50 later and you will have a well insulated, vented attic, keeping your ceiling cool, and adding resale value to your house, a white roof will also add resale value to a house in Arizona, because the shingles will last longer, and your cooling bills will be lower, white roof paint looks to be about $25 a gallon, and should cover 100-150 square feet of roof, last many years and it will never blow away.
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