What is a primary benefit of a cool roof?

• A. It reduces heat absorption, lowering cooling loads and urban heat island effect.
• B. It increases heat absorption in summer.
• C. It reduces energy use by requiring more insulation.
• D. It has no effect on building energy performance.

Answer: (A)

Cool roofs work by reflecting more of the sun’s rays and radiating heat away, which keeps the roof surface cooler and slows heat transfer into the building. Because the roof stays cooler, the interior heats up less, so the cooling system doesn’t have to work as hard, cutting the cooling load and overall energy use. In cities, cooler roofs also help reduce the urban heat island effect by releasing less heat into the surrounding air. The other statements don’t fit the idea: a cool roof does not increase heat absorption, and it doesn’t rely on more insulation to lower energy use—the main benefit comes from reducing heat gain in the first place, improving energy performance.