Is it okay to sleep in the car without turning on the air conditioning?

1 Answers
Spencer
07/30/25 10:16am
It is okay to sleep in the car without turning on the air conditioning. In fact, it is better not to turn on the air conditioning, especially when the doors and windows are closed. Here are the reasons why you can sleep in the car without turning on the air conditioning: Car "Internal Circulation": Internal circulation means the air circulates within the car without any external air entering. In this mode, outside exhaust fumes and dust do not enter the car, and the air conditioning's cooling and heating effects are more efficient. Internal circulation is suitable for use in traffic jams or polluted areas. However, if you sleep in the car with the air conditioning on and internal circulation activated, the small space and lack of air exchange with the outside can lead to oxygen depletion inside the car over time, potentially causing suffocation due to lack of oxygen. Car "External Circulation": External circulation allows a small amount of outside air to enter the car while the air is circulating, providing fresh air to the interior. However, this reduces the efficiency of the air conditioning's cooling and heating. External circulation is suitable for situations with many passengers or long drives. If you sleep with external circulation on and the car is in a confined, poorly ventilated space, such as a garage or near a wall, exhaust fumes can accumulate around the car and enter through the air conditioning intake, leading to carbon monoxide poisoning.
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