It’s been a long time since people would set out on a trip in the early hours of the morning to avoid driving under the hot sun, or driving down the motorway with the windows down to reduce heat build-up in the car. Unlike today, air conditioning was not standard equipment in the 80s. It takes three years to develop each model’s cooling system. This time is used to study the geometry of the ducts and vents in 3D, and virtual simulations are performed to predict how the air will flow inside the car. Nevertheless, people still make mistakes when using the air conditioning. Below are five of the most common ones and a few tips on how to make better use of it.