Should You Use Internal or External Air Circulation for Dehumidifying the Car Interior?

[AliyahRose]

Use external air circulation for dehumidifying the car interior. Below are situations when external circulation should be used: 1. After purchasing a new car: After buying a new car, you should open the external circulation as much as possible to maintain air flow between the inside and outside of the car, allowing harmful gases inside the car to evaporate and dissipate quickly. This is similar to opening windows for ventilation when moving into a new house. 2. Smoking in the car: If you like to smoke in the car, whether the vehicle is stationary or moving, you must turn on the external circulation to ensure smoke is quickly expelled from the car. This not only protects your health but also reduces the harm of secondhand smoke to other passengers. 3. Long-distance high-speed driving: During long high-speed drives, keeping the internal circulation on can easily lead to insufficient oxygen inside the car, causing driver fatigue and potential traffic accidents. In this case, switch to external circulation to replenish fresh air inside the car.