The heating and cooling system, sometimes referred to as the HVAC system, is one of the most important parts of your home. HVAC stands for Heating, Ventilation and Air Conditioning, the three main functions of a home comfort system. The system can control air temperature and humidity and maintain the quality of the air in your home. A central heating and cooling system produces warm or cool air in one central area and distributes it throughout your home. There are many types of systems that work as central systems, from traditional split systems (having both indoor and outdoor components) to packaged product systems (having one unified outdoor component for heating and cooling).