Credit: Tsuji / GettyYou've probably noticed the air recirculation button among the various bells and whistles on your car's dashboard. This little button, situated near the A/C controls, is identified by a car symbol with a U-turn arrow inside. You might even push it from time to time, but do you actually know what it does?Credit: Tsuji / GettyHow Does the Air Recirculation Button Work?The air recirculation function is essential in keeping you cool in the summer months, though few drivers realize it. According to the automotive repair company Eden Tyres & Servicing, the "air recirculation button effectively cuts off the outside air to the inside of the car." It's best to use this feature when it's hot outside, and you have the A/C turned on. It recirculates the slightly cool air that comes out of the A/C when you first turn it on instead of pulling the hot air in from outside. And the longer it's on, the cooler your car gets.When To Not Use the Air Recirculation FunctionThis function can be a lifesaver during long, hot summer days. However, you should avoid using the air recirculation function during the winter. As Eden Tyres & Servicing points out, recirculated air in the winter does not stop the cold air from entering your vehicle. The "fresh air" mode moves the cold air through the car's heaters, making the air warmer. This function also lessens the humidity inside the vehicle and will help windows to fog less and stay that way while you drive.AdvertisementAdvertisementThe next time you get into your hot, steamy car this summer, click the old recirculation button and see if it helps cool down your car faster. If it doesn't, you might want to have a mechanic take a look at it.Frequently asked QuestionsWhen should I use the recirculation feature?Use it in hot weather, during heavy traffic, or anytime you want to cool the car quickly. It’s also helpful when driving past smoky, dusty, or smelly areas.Does using recirculation improve fuel efficiency?Because the A/C doesn’t have to cool hot outside air over and over, it may use less energy, which can slightly improve your fuel economy—especially on sweltering summer days.AdvertisementAdvertisementWill recirculation make the air inside my car stale?It can if used for long periods. It’s a good idea to turn it off occasionally to bring in fresh air, especially on longer drives.Is it bad for my car if I leave the recirculation button on all the time?No. It’s not harmful to the vehicle, but it can become uncomfortable for passengers. Keeping recirculation on all the time may cause the cabin to feel stuffy or overly humid, and can make windows more likely to fog.Read the original article on Southern Living