No More AC? Scientist Invents the 'World's Whitest Paint' To Cool Down Your House The wonder paint reflects 95 percent of the sun's rays, making surfaces up to 19 degrees cooler.

By Jonathan Small

A scientist at Purdue University concocted a white paint that can cool down buildings and prevent global temperatures from rising.

Xiulin Ruan, a professor of mechanical engineering, created white paint that reflects 98% of the sun's rays away from the Earth's surface. When applied to the roof of structures, the paint cools down surfaces as much as eight degrees during the day and up to 19 degrees cooler at night, according to a report in The New York Times.

"If you were to use this paint to cover a roof area of about 1,000 square feet [93 m2], we estimate that you could get a cooling power up to 10 kilowatts. That's more powerful than the air conditioners used by most houses," Ruan said.

Scientists consider paints like this transformational for cooling down the planet and reducing electricity use, as buildings with this kind of white paint would require less air conditioning.

And Ruan doesn't want to stop at buildings. Last year, he announced that he has invented a version of this paint for vehicles, too.

Related: Going, Going, Gone! Climate Change Is Causing More Baseball Homeruns

World record holder

How white is the paint? In 2021, the Guinness Book of World Records named it the whitest paint on earth. But Ruan Ruan told the Times that wasn't the goal.

"We weren't really trying to develop the world's whitest paint," Dr. Ruan said. "We wanted to help with climate change, and now it's more of a crisis and getting worse. We wanted to see if it was possible to help save energy while cooling down the Earth."

Unfortunately, the paint won't be on sale for about another year, as researchers are working on improving its durability and resistance to dirt.

But with the planet recording record temperatures almost daily, the need for a global paint job couldn't come fast enough.

Jonathan Small

Entrepreneur Staff

Editor in Chief of Green Entrepreneur

Jonathan Small is editor-in-chief of Green Entrepreneur, a vertical from Entrepreneur Media focused on the intersection of sustainability and business. He is also an award-winning journalist, producer, and podcast host of the upcoming True Crime series, Dirty Money, and Write About Now podcasts. Jonathan is the founder of Strike Fire Productions, a premium podcast production company. He had held editing positions at Glamour, Stuff, Fitness, and Twist Magazines. His stories have appeared in The New York Times, TV Guide, Cosmo, Details, and Good Housekeeping. Previously, Jonathan served as VP of Content for the GSN (the Game Show Network), where he produced original digital video series.

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