The answer to 'central air or central air' is that central air conditioning and central air conditioning are the same thing. Central air conditioning refers to a whole-home cooling system that uses ducts to distribute cooled air throughout the house. This is the most common type of air conditioning system found in most homes.
Central air conditioning systems consist of an outdoor compressor/condenser unit and an indoor air handler or evaporator coil. The compressor circulates refrigerant to cool the air, which is then blown through the ductwork and into each room. Central air is more efficient and effective at cooling an entire home compared to window units or portable ACs, which only cool a single room.