Is it okay to sleep in the car with the air conditioning on and windows closed?

[DeGabrielle]

It is not advisable to sleep in the car with the air conditioning on and windows closed. In a sealed car, the air circulates internally through the air conditioning without being refreshed, leading to an increasing concentration of carbon monoxide inside the vehicle. Additionally, the exhaled carbon dioxide by passengers reduces oxygen levels rapidly, potentially causing nausea, unconsciousness within hours, and in severe cases, even suffocation and death. Below are the functions of a car air conditioning system: 1. Temperature Regulation: This is the primary function of car air conditioning. In summer, the cooling system produces cold air to lower the cabin temperature; in winter, except for large commercial vehicles that use independent combustion heaters, most vehicles utilize residual heat from the engine for heating. 2. Humidity Regulation: Humidity significantly affects passenger comfort. Cabin humidity should generally be maintained between 30% and 70%. Standard car air conditioning systems do not regulate humidity; only advanced luxury vehicles equipped with integrated heating and cooling systems can adjust humidity levels. 3. Airflow Regulation: The speed and direction of airflow greatly impact comfort. If air is blowing directly, the speed should be limited within a certain range when the temperature is appropriate. The airflow speed can be adjusted based on passengers' living environment, age, health, and temperature preferences. 4. Air Purification: The quality of cabin air is crucial for ensuring comfort.