Air handling units (AHUs) are essential components of heating, ventilation, and air conditioning HVAC systems. They are responsible for regulating and circulating air in buildings, ensuring a comfortable indoor environment. AHUs typically contain fans, filters, heating and cooling coils, and dampers to manage airflow and maintain air quality. These units can be found in various settings, including commercial buildings, hospitals, and schools. By conditioning the air, AHUs help control temperature, humidity, and ventilation, contributing to energy efficiency and occupant comfort. Proper maintenance of AHUs is crucial for optimal performance and longevity.