Home heating, ventilation, and air conditioning (HVAC) systems are important to keeping us comfortable in our everyday lives. Without HVAC, many of us would be uncomfortable no matter the weather outside. But what exactly is this essential system? What is the official business definition of HVAC? HVAC stands for “heating, ventilation, and air conditioning.” Basically, it’s a comprehensive system composed of different elements that work together to climate-control residential homes. Examples of HVAC components include things such as furnaces, boilers, air filters, blowers, humidity controls, heat pumps, and other related pieces. The main purpose of HVAC is to keep interior indoor air comfortable, unaffected by outside temperatures and humidities.