What's the difference between hot air and warm air in car air conditioning?

in a nutshell, the warm air uses the water temperature ~ ~ and the air conditioner uses the motor.

to explain again, the warm air is the heat from the warm air tank, which is blown into the cab through the air duct through the warm air motor. It has internal circulation and external circulation: the external circulation is a warm air motor, which blows outdoor air into the room through a warm air tank; The internal circulation is a warm air motor, which blows the indoor air into the room through the warm air tank, and the internal circulation heats up quickly.