Arthur H. Rosenfeld, physicist and former Commissioner of the California Energy Commission has suggested that on a clear day, a white roof is only 5°C to 10°C warmer than the ambient air.
In contrast, a conventional dark roof can get 40°C to 50°C hotter than the outside air, he explained.
Writing in the International Energy Agency's journal, Rosenfeld said: "My latest obsession is a campaign for white roofs in climates where summers are uncomfortably hot. White roofs not only reduce energy bills and dampen the urban heat island effect, but they also cool the world."
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