Can the car air conditioning be turned on without starting the engine?

[OJeremiah]

You cannot turn on the car air conditioning without starting the engine. The air conditioning compressor relies on the engine to operate and produce a cooling effect. If the engine is not started, turning on the air conditioning will not generate a cooling effect and will instead accelerate battery consumption. The heating function of the car air conditioning depends on excess heat from the engine. If the engine is not running, the heating mode will not provide much warmth, although some models come with a residual heat function that can maintain heating for a short time after the engine is turned off. Car air conditioning refers to the air conditioning system installed in vehicles, which can cool, heat, ventilate, and purify the air inside the cabin, providing a comfortable environment for passengers, reducing driver fatigue, and improving driving safety.