A cold source unit (2, 2A) that is connectable to a load device including a first expansion device and an evaporator and that is included in a refrigeration cycle apparatus (1, 1A), the cold source unit (2, 2A) comprising: a compressor; a condenser; a first flow path configured to receive refrigerant from the evaporator and send out the refrigerant toward the first expansion device via the compressor and the condenser; a second flow path configured to send, to the compressor not via the first expansion device and the evaporator, the refrigerant that has passed through the condenser; a second expansion device provided at the second flow path; a heater provided downstream of the second expansion device in the second flow path; a first temperature sensor and a second temperature sensor disposed upstream and downstream of the heater in the second flow path, respectively; a receiver disposed downstream of the condenser in the first flow path, the receiver being connectable to a first end of the second flow path and configured to store the refrigerant in a liquid phase; and a controller configured to control the refrigeration cycle apparatus based on outputs of the first temperature sensor and the second temperature sensor, wherein the first end of the second flow path is disposed to suction the refrigerant in a liquid phase from the receiver when an amount of the refrigerant enclosed in the refrigeration cycle apparatus (1, 1A) is not insufficient, a second end of the second flow path is connectable to a refrigerant inlet of the compressor, characterized in that the controller is configured, with the heater being off, to control the refrigeration cycle apparatus (1, 1A) such that temperatures detected by the first temperature sensor and the second temperature sensor become equal to each other, and calculate an average value of the temperatures detected by the first temperature sensor and the second temperature sensor, and in that the controller is configured to perform correction on each of the first temperature sensor and the second temperature sensor based on a difference between the average value and a temperature detected by a corresponding one of the first temperature sensor and the second temperature sensor. a compressor; a condenser; a first flow path configured to receive refrigerant from the evaporator and send out the refrigerant toward the first expansion device via the compressor and the condenser; a second flow path configured to send, to the compressor not via the first expansion device and the evaporator, the refrigerant that has passed through the condenser; a second expansion device provided at the second flow path; a heater provided downstream of the second expansion device in the second flow path; a first temperature sensor and a second temperature sensor disposed upstream and downstream of the heater in the second flow path, respectively; a receiver disposed downstream of the condenser in the first flow path, the receiver being connectable to a first end of the second flow path and configured to store the refrigerant in a liquid phase; and a controller configured to control the refrigeration cycle apparatus based on outputs of the first temperature sensor and the second temperature sensor, wherein the first end of the second flow path is disposed to suction the refrigerant in a liquid phase from the receiver when an amount of the refrigerant enclosed in the refrigeration cycle apparatus (1, 1A) is not insufficient, a second end of the second flow path is connectable to a refrigerant inlet of the compressor, characterized in that the controller is configured, with the heater being off, to control the refrigeration cycle apparatus (1, 1A) such that temperatures detected by the first temperature sensor and the second temperature sensor become equal to each other, and calculate an average value of the temperatures detected by the first temperature sensor and the second temperature sensor, and in that the controller is configured to perform correction on each of the first temperature sensor and the second temperature sensor based on a difference between the average value and a temperature detected by a corresponding one of the first temperature sensor and the second temperature sensor.