The term HVAC stands for Heating, Ventilation, and Air Conditioning, and it is a system used to control the temperature, humidity, and air quality of a space. HVAC systems are commonly found in homes, offices, and other buildings, and they are designed to provide comfortable and healthy living and working conditions. HVAC systems are composed of several components, including a furnace, air conditioner, air handler, evaporator coil, and thermostat. The furnace is responsible for heating the air, while the air conditioner cools it. The air handler is responsible for distributing the air throughout the space, while the evaporator coil is responsible for removing moisture from the air. Finally, the thermostat is responsible for regulating the temperature of the space. HVAC systems are essential for providing a comfortable and healthy environment, and they are used in a variety of applications, from residential homes to commercial buildings.