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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

Opinions expressed by Entrepreneur contributors are their own.

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 Leadership Network® VIP

Founder, Write About Now Media

Jonathan Small is an award-winning author, journalist, producer, and podcast host. For 25 years, he has worked as a sought-after storyteller for top media companies such as The New York Times, Hearst, Entrepreneur, and Condé Nast. He has held executive roles at Glamour, Fitness, and Entrepreneur and regularly contributes to The New York Times, TV Guide, Cosmo, Details, Maxim, and Good Housekeeping. He is the former “Jake” advice columnist for Glamour magazine and the “Guy Guru” at Cosmo.

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