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

[HazelLee]

Short-term use of internal air circulation is acceptable, but prolonged use can lead to passengers repeatedly breathing in the same stale air they exhale. Additionally, due to the car's good sealing, outside air cannot enter the cabin. Over time, this can cause passengers to feel fatigued and, in some cases, even pose a danger. Therefore, when driving on the highway, it is advisable to occasionally switch to external air circulation to help reduce fatigue. Extended Content: 1. Internal air circulation primarily recirculates the air inside the car. The advantage is that it helps maintain a cooler interior temperature and reduces the loss of cold air. However, the downside is that the air inside the car does not get refreshed, leading to stale air over time, which can make passengers feel tired. 2. External air circulation exchanges the air inside the car with outside air. The disadvantage is that some of the cool air inside the car may be lost, but the benefit is that it refreshes the cabin air, maintaining better air quality.