An HVAC system stands for Heating, Ventilation, and Air Conditioning. It is a technology used to control the indoor climate of buildings, ensuring comfort by regulating temperature, humidity, and air quality. HVAC systems can be found in homes, offices, and industrial spaces, providing essential heating during winter and cooling during summer. The system typically consists of several components, including a furnace or boiler for heating, an air conditioner for cooling, and ductwork for air distribution. Additionally, thermostats are used to monitor and adjust the temperature, while filters help maintain air quality by trapping dust and allergens.