Assembly of the air conditioning of a car and a girl doubting

Goodbye to heat in the car: the trick millions of Americans use to cool down

Millions of Americans have already tried this viral trick to cool down the inside of their car on the hottest days

During the summer months, parking your car in the sun becomes a real nightmare. The interior of vehicles can reach extremely high temperatures, as if you were in a sauna, and the difference between being inside the car or in hell seems minimal. Although many people think that only air conditioning can save us from that heat, a viral trick is changing the way drivers face this challenge.

The problem lies in the phenomenon known as the greenhouse effect, which causes heat to get trapped inside the car. Without proper protection, temperatures can exceed 122 °F (50 °C), and the metal surfaces and seats get so hot that they could cause burns. Fortunately, a basic physics trick can help us cool the car quickly.

Person driving a Toyota car with a United States flag and two overlapping red exclamation marks
Using the air conditioning consumes a lot of fuel | Pexels, Getty Images Signature

The viral trick that changes the rules of the game

According to British mathematician Hannah Fry, the trick is surprisingly simple. Instead of turning on the air conditioning, you just need to strategically open two parts of the car. The key is to lower the right rear window and fully open the left front door. Then, you should open and close the door repeatedly, creating an airflow that reduces the temperature inside.

This method works thanks to the physics behind air movement. The movement of the door creates a low-pressure area, which allows hot air to be expelled from the vehicle while cool air enters through the window. In a matter of seconds, the accumulated air leaves, and the temperature starts to drop.

Is it better than air conditioning?

Although air conditioning is still effective, it's not always the most efficient option. Starting the engine to cool the car uses fuel and can take several minutes to work, especially if the interior of the car has been very exposed to the sun. Meanwhile, Fry's trick works immediately, doesn't use energy, and is suitable for any car, regardless of the model.

Woman in a yellow t-jersey holding a water bottle under the strong sun, looking uncomfortable, with a thermometer showing an extreme heat warning.
In summer, cars can reach excessively high temperatures | Africa Images, en.estoesatleti.es, DG-STUDIO

This trick is perfect for when you have to wait in the car or make a quick stop. In addition, it doesn't contribute to gasoline consumption or the vehicle's polluting emissions. It's a quick, economical, and eco-friendly solution.

Why has it gone viral?

The trick's virality on TikTok isn't surprising. In a summer when extreme temperatures affect many regions, any way to relieve the heat is welcome. Thousands of users have replicated the trick, sharing its effectiveness on social media. This phenomenon shows that sometimes the simplest solutions are the most effective.

Although the viral trick is effective, it's also important to take other measures to protect your car from the heat. Whenever possible, park in shaded areas or use reflective sunshades. It's also advisable not to leave heat-sensitive objects inside the car.

Some people even leave the windows slightly open when they park the car, or activate the ventilation before getting in. Others choose to tint the windows to reduce heat entry. A good additional trick is to place towels on the steering wheel and seats to avoid burns when touching them.