Can the air conditioning be turned on when the car is turned off?

[DelCassandra]

You can turn on the air conditioning when the car is turned off, but it will not provide cooling function. Moreover, prolonged use may easily lead to battery depletion. Therefore, it is not recommended to keep the air conditioning on for a long time when the car is turned off. If you need ventilation, you should also switch to the external circulation mode to allow fresh air to enter the car. The air sent by the air conditioning is just natural air blown by the blower, as the air conditioning compressor is driven by the engine's power and does not work when the car is turned off. The natural air blown by the blower is powered by the battery, and excessive consumption of the battery by the blower may cause long-term battery depletion. Of course, this only applies to traditional fuel vehicles.

[StOlivia]

Having driven a taxi for over a decade, I've seen too many passengers request to turn off the engine and keep the AC running. Honestly, once the engine stops, the compressor becomes practically useless. The blower can only push out the residual cool air left in the ducts, and within five minutes, it turns into hot air. The key issue is that the blower drains the battery extremely fast when the engine is off. Last year, my apprentice ruined a brand-new battery by doing just that. If you really need to rest, idling for ten minutes is far better than turning off the engine and running the AC.