HVAC stands for Heating, Ventilation, and Air Conditioning. It is a system that is used to regulate the temperature, humidity, and air quality of a space. Air conditioning is a part of the HVAC system, and is responsible for cooling the air in a space. It works by using a refrigerant to absorb heat from the air, and then releasing it outside. The air conditioning system is connected to the other components of the HVAC system, such as the heating system, ventilation system, and air filtration system, to ensure that the space is comfortable and safe.