A working fluid medium temperature control system comprises an actuator operable on a working fluid medium, a pump for the working fluid medium, a fluid passage structure for the working fluid medium, an electric motor drivingly connected to the pump, and a control unit for the electric motor, the control unit including an inverter and an inverter controller. The inverter and the electric motor are integrated in such a way that the inverter is in heat transfer communication with the electric motor. The fluid passage structure is in heat transfer communication with the inverter.