Is it better to use the internal or external circulation when turning on the air conditioning in a sedan?
1 Answers
When turning on the air conditioning in a car, it is best to alternate between internal and external circulation. Here is some relevant information: 1. Internal circulation means that the air blown by the blower circulates inside the car. Since no external air is involved, it has advantages such as fuel efficiency and faster cooling (or heating), but the disadvantage is that it is not conducive to updating the air inside the car. 2. External circulation means that the blower draws fresh air from outside the car into the interior. The advantage is that it ensures air quality inside the car, but cooling (or heating) is slightly slower and it consumes more fuel. 3. In summer, when turning on the air conditioning, you should first open the windows to ventilate and allow the car to dissipate heat, lowering the interior temperature before turning on the air conditioning. Start with internal circulation, and once the interior temperature drops to a suitable level, switch to external circulation to maintain fresh air inside the car. 4. In winter, it is not advisable to use internal circulation because the outside air is dry and cold, while the interior tends to be more humid, leading to condensation. In this case, external circulation should be used to introduce the dry, cold air from outside into the car.
