No, not all HVAC units have an air handler. The presence of an air handler in an HVAC system depends on the type of system being used. An air handler is a key component of systems that use forced air for heating, ventilation, and air conditioning.
In central HVAC systems, which are common in residential and commercial buildings, an air handler is typically included. It is responsible for circulating and distributing conditioned air throughout the building. The air handler contains the blower fan, evaporator coil, and filter.
However, there are other types of HVAC systems that do not use air handlers. For example, ductless mini-split systems consist of an outdoor condenser unit and one or more indoor air handling units, eliminating the need for a centralized air handler. Similarly, window units and portable air conditioners do not have a separate air handler.
The presence of an air handler depends on the specific design and configuration of the HVAC system, and different systems may utilize different components for air circulation and conditioning.