A commercial air air handling unit (AHU) is a critical component of a commercial HVAC system. It is responsible for circulating air throughout the building, controlling temperature, humidity, and air quality. An AHU is typically a large metal box that houses a blower, filter, and other components. The blower pulls air from the outside and pushes it through the filter, where it is cleaned and conditioned before being distributed throughout the building. The AHU also has a variety of other components, such as dampers, coils, and reheaters, which help to control the air temperature, humidity, and air quality. By controlling these factors, an AHU helps to ensure a comfortable environment for occupants and helps to reduce energy costs. AHUs are essential for any commercial building and are an important part of any HVAC system.