It’s a great idea to paint one’s roof white, as it reflects more light back into space and does a bit to alleviate the greenhouse effect. Dr. Steven Chu gained fame for claiming that the reduction in global warming caused by painting roofs white is equivalent to taking cars off the road for eleven years! It is an especially helpful strategy in the city, where buildings heat up quickly in the summer; it acts as a type of air conditioner that requires no energy ro run.
The most substantial drawback is simply the aesthetic preference for dark roofs. However, all flat roofs could be painted white because they are never seen anyway. And using a light off-white color can have almost the same effect as using white. Another environmentally conscious decision for one’s house, by the way, is a “green roof” on which plants grow.
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