Should the Air Conditioning Be Set to Internal or External Circulation When Sleeping in a Car?

1 Answers
AlyssaMarie
07/30/25 10:37am
It is recommended to use external circulation when sleeping in a car to ensure proper air ventilation. If the surrounding environment has poor air circulation and the car is left idling while sleeping, carbon monoxide produced during idling can accumulate and fail to dissipate. This can lead to carbon monoxide poisoning inside the car, with potentially dire consequences. The following precautions should be taken when sleeping in a car: Ventilation: Always leave a gap for air circulation when sleeping in a car. Do not close all windows and doors tightly to avoid oxygen deprivation or suffocation. However, the gap should not be too large to prevent attracting unwanted attention or theft. Air Conditioning Usage: It is best to turn off the compressor and switch the air conditioning to external circulation mode, allowing natural airflow into the car to maintain ventilation. Avoid using the compressor and internal circulation mode to prevent carbon monoxide poisoning. Parking Location: Choose an open area for resting in the car. Avoid parking in underground garages or other confined spaces to prevent carbon monoxide buildup.
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