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Should You Use External or Internal Air Circulation on the Highway?

1 Answers

OwenLee

07/30/25 4:43am

When driving on the highway, it is recommended to use the external air circulation mode for the air conditioning. The reasons for using external air circulation on the highway are as follows: 1. Highway: When driving on the highway, the windows are usually closed, preventing air circulation inside the vehicle. Turning on external air circulation allows outside air to enter the cabin, improving air freshness. 2. Air Conditioning: External air circulation has minimal impact on air conditioning efficiency during high-speed driving, whereas using it in daily driving may reduce cooling effectiveness. 3. Windshield: Fogging on the windshield is mainly caused by excessive humidity inside the cabin. External air circulation continuously supplies fresh air, maintaining optimal humidity levels and reducing the likelihood of fogging.

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