To prevent the occurrence of low temperature trouble in a load heat exchanger at the time of switching an operation mode.

This heat source equipment utilizing geothermal sources or snow melting equipment performs switching between a temperature rise mode operation of operating a heat pump apparatus 4 while a heat medium L is circulated through a heat source side circulating passage 7 extended between an underground heat exchanger 1 for performing heat exchange for the heat medium L to the ground and the heat pump apparatus 4 and through a load side circulating passage 8 extended between a radiating part 4c of the heat pump apparatus 4 and a load heat exchanger 2, respectively, and a direction mode operation of circulating the head modium L in a direct circulation passage 9 extended between the underground heat exchanger 1 and the load heat exchanger 2 in the state of bypassing the heat pump apparatus 4. The equipment is provided with a control means 6 for switching the operation mode to the transient mode operation of circulating the heat medium L in the heat source side circulating passage 7 in the state of stopping the heat pump apparatus 4 from the temperature rise mode operation in switching from the temperature rise mode operation to the direct mode operation, and switching the operation mode to the direct mode operation after the transient mode operation is performed.