To provide a system for controlling temperature with which increase in heating costs is suppressed during dehumidification.

The system for controlling temperature has the following mechanism: a dehumidifying indoor unit 73 introduces air in a greenhouse 52, cools the air by using a cooling medium (liquid) and blows the cooled air into the greenhouse 52; a dehumidifying outdoor unit 74 compresses the refrigerant (gas) from the dehumidifying indoor unit 73 using an integrated compressor (not shown in the figure), makes the refrigerant gas have a high temperature, and then rotates a fan; rotation of the fan results in making the air brought into the greenhouse 52 is warmed by the high-temperature cooling medium (liquid); and the warmed air is blown into the greenhouse 52. The system can be applied to a greenhouse temperature control system controlling the temperature in a greenhouse where farm products are cultivated.