HVAC stands for Heating, Ventilation and Air Conditioning. It is a technology used to control the indoor temperature and humidity of a building or home. HVAC systems are used to provide comfort for occupants by controlling the temperature, humidity, air flow, and air quality within the space. They are also used to reduce energy costs by regulating energy use in buildings. HVAC systems can be found in residential homes as well as commercial buildings such as offices, hospitals, schools and factories.