HVAC systems, which stand for heating, ventilation, and air conditioning, are essential for maintaining a comfortable indoor environment. They regulate temperature, humidity, and air quality by eliminating contaminants and controlling temperature. The core tasks of an HVAC system are to cycle air, adjusting temperature, and improving indoor air quality. Common types of HVAC systems include split systems, packaged systems, ductless mini-splits, and hybrid heat pumps. While air conditioners only cool buildings, HVAC systems offer comprehensive indoor climate management. Understanding the components, functions, and types of HVAC systems helps make informed decisions for comfort and efficiency.