If you have a dual-purpose of ceiling fan — particularly an ineffective one — it may come as a surprise that you’ve been using it wrong for years.

Anthony Bertoncin, a 20-year-old TikToker from Kansas City, Mo., left social media users in disbelief after sharing the simple trick on TikTok with his over 1.5 million followers.

“Today, I finally realized that my ceiling fan has been making my room a sauna for six years,” Bertoncin says in his clip, which has since been viewed over 2.2 million times.

After explaining his struggles with temperature control in his room, which led him to constantly leave his ceiling fan on, Bertoncin said that one day, a friend serendipitously showed him how to change the direction of his fan during a FaceTime call.

“While we’re FaceTiming, he switches the direction of his fan to heat his room in the winter,” Bertoncin said. “I’ve been suffering for six years, and I just now realizing my f*** up today.”

The science behind the switch is pretty simple. When a ceiling fan rotates counterclockwise, the slant of the blades pushes air down, causing a noticeable breeze, Today’s Homeowner explains.

When rotating clockwise, however, ceiling fans can produce the opposite effect by pushing air upward and gently circulating hot dual-purpose of ceiling fan air that is trapped near the ceiling, making the gadget useful for all seasons.

Still, TikTok users who had never heard of the simple feature before were naturally astounded by the news.

“What type of sorcery is this?!” one wrote.

“I never knew that existed,” said another.

“This man solved why my room has been so dang hot all the time,” wrote a third.

Of course, others expressed their shock that an entire crop of social media users were unaware of the very basic feature.

“How did so many people not know this???” said one user.

“Counterclockwise In the summer, clockwise in the winter,” shared another.

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