HVAC stands for heating, ventilation, and air conditioning. Such systems provide heating and cooling to residential and commercial buildings. In the day-to-day world, you can find HVAC systems anywhere from single-family homes to submarines, where they provide the means for environmental comfort. In the following HVAC diagram, we have illustrated how the HVAC works and its main components. For instance, while designing an HVAC diagram, always remember to add a Chiller/Boiler, Cooling/Heating Coil, Supply Air, Thermal Zone, and Dampers. Even though such HVAC diagrams look complex, if you use tools like EdrawMax or EdrawMax Online, creating such HVAC diagrams would become extremely easy.