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Is it more fuel-efficient to use the internal or external air circulation?

1 Answers

LawsonRose

07/29/25 6:31pm

Using the internal air circulation is more fuel-efficient than the external air circulation. Here are the relevant details: External air circulation: External air circulation refers to drawing air from outside the vehicle, directing it to the air conditioning system for heating or cooling, and then blowing it out through the vents. External circulation can replenish fresh air and improve the air quality inside the vehicle. However, if the weather outside is extremely dry and hot, using external circulation requires the air conditioning compressor to work continuously to cool the hot air from outside, which consumes a certain amount of fuel. Internal air circulation: Internal air circulation involves recirculating the air inside the vehicle. The air conditioning system draws in the interior air, cools it, and then returns it to the cabin. Once the interior temperature drops to the set value, the air conditioning compressor stops working, reducing the engine load. Therefore, the faster the interior temperature reaches the set value, the sooner the engine load is reduced, leading to lower fuel consumption.

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