To provide a temperature controlling device capable of causing constant flow of gas and liquid flowing in one direction flow in both plus and minus directions, smoothly adjusting the flow rate of the gas and liquid from a plus to a minus and also smoothly adjusting cooling and heating with one refrigerant circuit.

A bridge circuit is composed of four controllable flow rate valves with a large/small flow rate. The bridge circuit divides a conventional circuit into a primary circuit and a secondary circuit. By controlling the opening of each of the four flow rate valves, the pressure, flow rate and direction of the secondary circuit are smoothly controlled without changing the pressure, flow rate and direction of the primary circuit. By utilizing the bridge circuit composed of the four controllable flow rate values of a large/small flow rate, the pressure, flow rate and direction of an output refrigerant can be controlled from a plus maximum of compressor output to a minus maximum without changing the rotating speed and direction of a compressor so that this temperature controlling device can smoothly adjust heating and cooling only with the refrigerant.