This paint ‘sweats’ to keep your house cool

An experimental, cement-based paint cools buildings by combining sunlight reflection and water evaporation

A close-up from the elbows down of a person painting the siding of a house. One hand holds a paintbrush while the other holds a tray of white paint

A new cooling paint reflects sunlight and mimics sweat to reduce air-conditioning use.

Marie LaFauci/Getty Images

A cool house without air conditioning may soon be possible.