HVAC: It is an abbreviation for heating, ventilation, and air conditioning systems. The technology of automotive environmental comfort.
Heating: In a vehicle, heating stands for raising the temperature inside the vehicle using heat from the engine.
Ventilating: It is the process of replacing the air in vehicle space to control the temperature or remove moisture, odors, smoke, heat, dust, airborne bacteria, carbon dioxide, and to replenish oxygen. Ventilation includes both the exchange of air to the outside as well as circulation of air within the vehicle.
Air Conditioning: It means the removal of heat from the vehicle using a refrigerant.