A cooling warehouse, comprising: a warehouse main body in which an introduction port through which air outside the cooling warehouse is introduced and a discharge port through which air inside the cooling warehouse is discharged are formed; an air-sending device (31b, 32b) configured to introduce air outside the cooling warehouse to an inside of the cooling warehouse and discharge air inside the cooling warehouse to an outside of the cooling warehouse; a plurality of leakage detectors (41a, 41b) provided at different heights in the cooling warehouse and each configured to detect refrigerant; a controller configured to control the air-sending device (31b, 32b) depending on whether or not one of the plurality of leakage detectors (41a, 41b) detects refrigerant, whether or not an other of the plurality of leakage detectors (41a, 41b) detects refrigerant, and a time during which refrigerant has been detected by each of the plurality of leakage detectors (41a, 41b); and a refrigeration cycle apparatus including an outdoor unit and an indoor unit connected by a high-pressure pipe and a low-pressure pipe, a high-pressure pipe isolation valve being provided at the high-pressure pipe, a low-pressure pipe isolation valve being provided at the low-pressure pipe, the plurality of leakage detectors (41a, 41b) including a first leakage detector provided at a lowest position among positions of the plurality of leakage detectors (41a, 41b), in a case where the first leakage detector detects refrigerant, the controller being configured to drive the air-sending device (31b, 32b), the plurality of leakage detectors (41a, 41b) including a second leakage detector provided at a position higher than the first leakage detector, in a case where the first leakage detector has detected refrigerant for a time equal to or longer than a first time or in a case where the second leakage detector detects refrigerant, the controller being configured to close the high-pressure pipe isolation valve and the low-pressure pipe isolation valve. a warehouse main body in which an introduction port through which air outside the cooling warehouse is introduced and a discharge port through which air inside the cooling warehouse is discharged are formed; an air-sending device (31b, 32b) configured to introduce air outside the cooling warehouse to an inside of the cooling warehouse and discharge air inside the cooling warehouse to an outside of the cooling warehouse; a plurality of leakage detectors (41a, 41b) provided at different heights in the cooling warehouse and each configured to detect refrigerant; a controller configured to control the air-sending device (31b, 32b) depending on whether or not one of the plurality of leakage detectors (41a, 41b) detects refrigerant, whether or not an other of the plurality of leakage detectors (41a, 41b) detects refrigerant, and a time during which refrigerant has been detected by each of the plurality of leakage detectors (41a, 41b); and a refrigeration cycle apparatus including an outdoor unit and an indoor unit connected by a high-pressure pipe and a low-pressure pipe, a high-pressure pipe isolation valve being provided at the high-pressure pipe, a low-pressure pipe isolation valve being provided at the low-pressure pipe, the plurality of leakage detectors (41a, 41b) including a first leakage detector provided at a lowest position among positions of the plurality of leakage detectors (41a, 41b), in a case where the first leakage detector detects refrigerant, the controller being configured to drive the air-sending device (31b, 32b), the plurality of leakage detectors (41a, 41b) including a second leakage detector provided at a position higher than the first leakage detector, in a case where the first leakage detector has detected refrigerant for a time equal to or longer than a first time or in a case where the second leakage detector detects refrigerant, the controller being configured to close the high-pressure pipe isolation valve and the low-pressure pipe isolation valve.