Does a car's air conditioning use oil or electricity?

[OMax]

The air conditioning in a car can use either oil or electricity. The functions of the air conditioning system are: 1. To achieve a cooling effect through the continuous phase change cycle of the refrigerant; 2. To remove dust, odors, smoke, and toxic gases from the air inside the car, making the interior air fresher, and to humidify the air inside the car, increasing the relative humidity; 3. To use the engine coolant, waste heat, or heat generated by a burner as a heat source for heating, which is then distributed by a blower to warm the air inside or outside the car, raising the temperature at the air vents for heating purposes; 4. To draw in fresh outside air for ventilation and air exchange, which also helps prevent fogging on the windows.