What gear should be engaged when running the air conditioner for a long time while parked?

[StLeonardo]

If you need to run the air conditioner for an extended period while parked, it is best to engage the P (Park) gear. The P gear is the parking gear, where the transmission's parking mechanism locks the vehicle, preventing it from rolling. Alternatively, you can also use the N (Neutral) gear, but since N is the neutral position, the transmission is not under load, and the vehicle can move. In this case, be sure to engage the parking brake (handbrake) to prevent the vehicle from rolling. Below are the functions of a car's 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 for warming. 2. Humidity regulation: Humidity significantly affects passenger comfort. The cabin humidity should generally be maintained between 30% and 70%. Standard car air conditioning systems do not regulate humidity; only ventilation systems or advanced luxury cars with integrated heating and cooling systems can adjust humidity. 3. Airflow regulation: The speed and direction of airflow greatly impact comfort. If air is blowing directly, the speed should be limited to 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: Cabin air quality is crucial for comfort.