A control box assembly for use in an air conditioner of the type having an enclosure which includes a basepan and an outer housing. The air conditioner has an inside section and an outside section in the enclosure which are divided by a partition which forms a part of the basepan. The outside section includes an outside heat exchanger, a compressor, and an outside fan driven by an outside fan motor. The inside section includes an inside heat exchanger and an inside fan driven directly by an inside fan motor. The control box assembly includes a molded plastic box having an open end which has mounted therein the control switches for the compressor and the outside and inside motors. Inside fan motor is mounted and supported within the control box. A molded plastic cover is adapted to snap fit onto the control box to cover the opening and further support the inside fan motor.