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 furnaces, air conditioners, ventilation ducts, and thermostats. These elements work together to circulate air, filter pollutants, and maintain a consistent temperature. Proper maintenance of an HVAC system is crucial for efficiency and longevity, helping to reduce energy costs and improve indoor air quality.