An air handling unit (AHU) is a crucial component of HVAC systems, responsible for circulating and conditioning air within buildings. It typically consists of fans, heating and cooling coils, filters, dampers, and controls. The primary function of an AHU is to regulate indoor air quality by controlling temperature, humidity, and air circulation.The process begins with the AHU drawing in ambient air, which passes through filters to remove contaminants. Then, depending on the desired temperature, the air is either heated or cooled by the coils. Fans within the unit circulate the conditioned air throughout the building via ductwork.