Car air conditioning systems in their broadest sense mean, modifying the condition of air in the interior of a car, through proper ventilation within the system, for thermal comfort. The common understanding of this statement is that it carries out the de humidification act of the indoor air through refrigeration.

Basically, the refrigerators and air conditioners work in the same principle. The air conditioners may use oil, chemicals, gas and alike for the mechanism. Its main function is to regulate the temperature commanded by the thermostat in it. Besides that, it also helps in cleaning the air and maintaining humidification of the room or the car to the comfort level.

The car air conditioning systems have the following mechanical units for regulating the air temperature within the car:

1. Compressor: Commonly called the heart of AC, it is attached to a belt driven by pump that is affixed to the engine. It's main function is to compress and transfer the refrigerant gas.

2. Condenser: The heat dissipation takes place in this area. It radiates the heat and regulates the temperature for cooling the interior of the car.

3. Evaporator: The heat radiated by the condenser is absorbed by the evaporator. It is the primary unit to remove heat from your vehicle. The secondary function is de humidification. Maintaining a proper humid area is very important for apt functioning of the air conditioner and it is regulated by these humidifiers.

4. Thermostat: The thermostat is the controlling unit of your automobile AC. This is where you regulate the temperature as per your requirement.