A room air conditioner has two separate and distinctive air circuits. By one circuit, air is drawn from outside into the unit when it passes through the air cooled condenser over the motor compressor and return outside to remove the heat from the condenser. Thus, the function of one circuit is completed. In second circuit, the room is cooled. Air passes from the room into the evaporating coil through the filter which removes dust, limit and other impurities. Air gives up some heat to evaporator coil and back out side. This air is to be conditioned into the room. Thus the function of second circuit is completed.