Should You Use Internal or External Air Circulation When Running the AC on Rainy Days?

[Cruz]

On rainy days, it is better to use the external air circulation in your car. During rainy weather, when it's cold, both side windows can fog up, obstructing the driver's view. Therefore, it is advisable to first use the external air circulation and adjust the airflow direction towards the windshield. Using external circulation helps expel the moisture exhaled by passengers from the vehicle, while the outside cold air is less prone to condensation. Important Notes: 1. Note One: When the outside air quality is poor or heavily polluted, such as on dusty roads, in congested traffic, or near chemical plants where there are foul odors or unusual smells, use internal circulation to prevent the poor outside air from entering the car; 2. Note Two: In summer, to quickly cool down the car's interior with the AC, you can use internal circulation; 3. Note Three: In winter, using internal circulation can help keep the car interior warmer.