Vehicles usually come with two air circulation buttons, the fresh air and the air re-circulation button. The former is used to blow air from outside into the car, while the latter is used to circulate the air inside the car. Once you press this button, it closes the air duct, preventing outside air from entering into the car. This button is found on the A/C control panel of your car, and you can easily recognize it since it is almost similar to a recycling sign. When to Use Air Re-circulators This button is most effective during the hot days, as it helps cool down the air inside the car. This increases the performance of the car’s blower and air compressor on