HVAC stands for Heating, Ventilation, and Air Conditioning, and is a system that is used to control the temperature, humidity, and air quality in a given space. It is an important part of modern buildings, as it helps to ensure that the environment is comfortable and safe for the occupants. HVAC systems are typically made up of a combination of heating, cooling, and ventilation components, such as air handlers, fans, coils, and ducts. The system works by circulating air throughout the building, and by using the components to regulate the temperature, humidity, and air quality. The system can also be used to filter out pollutants and other contaminants from the air, making it healthier for the occupants. HVAC systems are an important part of keeping buildings comfortable and safe, and they are used in a variety of different types of buildings, from residential homes to commercial offices.