Should You Use Internal or External Air Circulation When Running the Car AC?

[VanRichard]

When using the air conditioning, it is generally recommended to select internal air circulation, but the choice should also depend on the driving environment. Sometimes, you can directly use internal circulation, and it's advisable to alternate between the two modes. Detailed information is as follows: 1. External circulation: This mode uses a fan to draw outside air into the car, meaning there is an airflow channel between the outside and inside of the vehicle. The air blown by the fan comes from outside, so even when the fan is running, outside air continues to enter the car, replenishing the interior with fresh air. 2. Internal circulation: This mode closes the airflow channel between the inside and outside of the car. When the fan is running, no outside air enters, and the air drawn in comes solely from inside the car, creating a closed-loop airflow within the vehicle.