Abstract: A VAV solid state VAV fan series and parallel fan controller for controlling a fan and at least one stage of reheat in a ventilation system in response to signals from an external VAV controller is disclosed. The VAV solid state VAV fan series and parallel fan controller is in connection with at least one transformer, external VAV controller, fan, speed adjuster, reheat device, and circuit breaker for conditioning an air volume. A sensor associated with the external VAV controller constantly monitors room temperature and generates signals for the controlled operation of the device. The preferred invention has a plurality of terminal blocks with each terminal block having single point connections. The invention includes at least one fan relay that initiates power to start the fan and at least one reheat relay that initiates power to reheat device in stages in response to the signals from the external VAV controller.