Last year, I had my roof redone in a light tan color and I've noticed a substantial decrease in heat gain (I also had solar shades put up on the west side windows). So although it wasn't a scientific study, I think there is some validity to the "white roof" theory. Would you wear a black t-shirt on a sunny day? Only if you were always cold.
So the next time you need to redo your roof, why not invest in lighter color materials? It'll save you some dollars on your cooling bill.
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