Heat recovery devices are used for saving energy especially for the renewable energy systems because of effective usage of electrical energy while providing air conditioning in spaces which needs fresh air. These devices pay back installation costs by saving energy in a short period. In terms of energy recovery, it is very important to design the power control panels which controls the fan and heater level of the heat recovery devices. In this paper, a power control unit which controlling the heat recovery unit has been designed. The heat recovery units and control panels have been studied and a power control unit controlling of fan and temperature has been developed. In design and simulation works, using by Proteus pressed circuit card development program and microcontroller based PIC-C program as hardware and software of the unit has been developed.