Should You Use External or Internal Air Circulation in Winter?

[McBrianna]

In winter, it is recommended to use the internal air circulation in your car. Here are the relevant details: 1. If the car is cold in the morning and the interior temperature is very low, you can turn on the internal circulation to allow the temperature to rise more quickly. Once the temperature has increased, switch to external circulation to introduce some fresh air. 2. Internal circulation blocks polluted air from outside. If the car's air conditioning system only has external circulation, dust raised by passing vehicles on certain roads will be sucked into the car, and the polluted air will make the interior environment unsuitable for driving. Therefore, the control system is set to close the external circulation duct, blocking polluted air from outside. However, the air conditioning fan should still remain operational to maintain a comfortable temperature inside the car. 3. After prolonged use of internal circulation, the air inside the car can become very stale. At this point, people inside the car may feel stuffy. If internal circulation is used for too long, the poor air quality inside the car can cause many people to experience motion sickness.