Are air handling units part of HVAC?

Yes, air handling units (AHUs) are an integral part of HVAC systems. AHUs are responsible for controlling the temperature, humidity, and air quality of a building by circulating and filtering air. They are typically composed of a fan, filter, and heating and cooling coils, and are used to regulate the air pressure and temperature of a space. AHUs are also used to reduce energy costs by controlling the amount of air that is circulated throughout a building.