What is the correct way to operate the air conditioning while sleeping in a parked car?

[SanCali]

Here are the correct operating steps for sleeping with the air conditioning on in a parked car: 1. First step: It should be noted that running the air conditioning while parked refers to idling the engine. Otherwise, if the car is turned off, the air conditioning will only operate the blower, delivering natural air. 2. Second step: Idling with the air conditioning on theoretically does not harm the car, but the main issue is fuel consumption. According to relevant tests, the fuel consumption of idling with the air conditioning on is related to the car's displacement and even the engine tuning. Based on tests, a typical household car consumes approximately 1-2 liters of fuel per hour when idling with the air conditioning on, though this varies by model. 3. Third step: Even if fuel consumption is not a concern, sleeping with the air conditioning on while idling is unsafe for health. Since the air inside the car cannot circulate, carbon monoxide emitted by the engine can leak into the car and accumulate, increasing its concentration and leading to poisoning. There have been many cases where people never wake up after falling asleep under these conditions.