Should You Use External or Internal Air Circulation for Car AC in Summer?

[VonVincent]

In summer, using the external air circulation mode in a car's AC system can quickly introduce fresh air into the vehicle; while the internal circulation mode enables faster cooling of the cabin and blocks harmful external gases. Whether heating or cooling, to rapidly achieve the desired cabin temperature initially, windows are usually closed. Over time without fresh air intake, the cabin air becomes stale - this is when you should switch to external circulation to allow fresh outside air in. Methods for using and maintaining car AC systems include: 1. Avoid setting temperature too low; 2. Adjust vent direction properly; 3. Don't use continuously for extended periods; 4. Occasionally use higher fan speed; 5. Turn off AC during low-speed driving.