Environment Making roofs white or reflective is the best way to keep a city cool So-called “cool roofs” would bring down the average air temperature in cities like London during a heatwave ...

Regular white paint might reflect 85% of the sunlight that hits it. The new coating, depending on its thickness, could reflect as much as 99%. (If used with colored paint, it’s less effective ...

Adding a white, reflective coating to a rooftop can help keep a house cooler in the summer and save on air-conditioning bills. But if you live in a city with cold winters, the same coating leads ...