Secretary Chu's cool roof passion

We were happy to read about the Secretary of Energy extolling the benefits of cool roofs

From Consumer Reports:

"...a white (or "cool" as we call 'em) roof could potentially lower the surface temperature of your roof by up to 100°F. That's according to the California Energy Commission, which estimates that cool roofs can trim cooling costs by 20 percent on average in the Golden State."
 
The DOE has a cool roof calculator that you should use to determine whether or not painting your roof white will work for your home.