An HVAC 시스템, which stands for Heating, Ventilation, and Air Conditioning, is a technology used to control the indoor climate of buildings. It provides heating in the winter, cooling in the summer, and ensures proper ventilation throughout the year. This system helps maintain comfortable temperatures and air quality for occupants. The HVAC 시스템 consists of various components, including furnaces, air conditioners, ventilation ducts, and thermostats. These elements work together to regulate temperature and humidity levels, making indoor spaces more comfortable and energy-efficient. Proper maintenance of an HVAC 시스템 is essential for optimal performance and longevity.