Should You Use Internal or External Air Circulation in Your Car During Summer?

[MichaelAnn]

During summer, it's necessary to use both internal and external air circulation in your car. The correct way to operate the car's air conditioning in summer is: first turn on the external air circulation to expel the hot air inside the car. Once you feel a noticeable drop in the cabin temperature, you can then switch to internal air circulation. When driving at high speeds, using only internal air circulation in a closed cabin can easily lead to insufficient oxygen levels, which may cause driver fatigue. Therefore, it's advisable to use external air circulation during highway driving or long-distance trips. External air circulation primarily serves to ventilate the cabin. It should be activated when the air inside the car becomes stale, as it uses the fan to draw in outside air. This means the air ducts inside and outside the car are connected, allowing fresh air to enter even when the fan is off. Internal air circulation means the air blown by the fan only circulates within the car. Since no outside air is involved, it has the advantages of saving fuel and providing faster cooling (or heating).