First and foremost, commercial HVAC systems are larger and require more energy consumption than residential ones. Secondly, they have a more complex structure and extensive ductwork due to the size of the spaces they need to heat and cool. Thirdly, commercial HVAC systems often have different heating and cooling needs, such as specific zones or varying occupancy loads, which residential systems typically do not face. And finally, they can be integrated with other systems like air purifiers and humidifiers.