Use Internal or External Air Circulation When Turning on the AC?

[LaJames]

When turning on the AC, alternate between internal and external air circulation. The correct approach for using AC in summer: After getting in the car, first open the windows to ventilate and allow the interior to cool down. Open the doors and windows to lower the interior temperature before turning on the AC. Start with internal circulation to achieve the fastest cooling. Once the interior temperature drops to a comfortable level, switch to external circulation to maintain fresh air inside the car. Internal circulation means the air blown by the fan only circulates within the car, with no outside air involved. This method saves fuel and cools quickly but has the disadvantage of reducing air quality inside the car. External circulation means the fan draws air from outside the car and blows it inside, which helps maintain fresh air but consumes more fuel and cools more slowly.