A refrigeration system comprising: - a liquefied natural gas regasification installation; - a cold room; and - a refrigeration installation connected to the liquefied natural gas regasification installation by means of a supply line of coolant at low temperature and configured to maintain the cold room at a certain temperature, the refrigeration installation comprising: - at least one air cooler, placed inside the cold room and which comprises a defrost system and a set of tubes, - a pipe circuit connecting an outlet of the set of tubes of the air cooler to an inlet of said set of tubes, for recirculating outputted coolant from the air cooler; - a pump, placed on the pipe circuit connected to the outlet of the set of tubes for moving the outputted coolant through the pipe circuit, - an adjustable three-way valve, located in the pipe circuit downstream the pump and connected to an outlet conduit in order to enable the evacuation of the outputted coolant that comes out of the pump, adjusting the amount of coolant that is maintained in the pipe circuit; - a supply conduit connected to the supply line of the LNG regasification installation and connected to the pipe circuit downstream the pump for introducing the coolant at a lower temperature than the outputted coolant that comes from the air cooler, thus producing a mixed coolant in the pipe circuit, - a control unit, connected with the air cooler, the pump, and the adjustable three-way valve; - a first shut-off valve located in the supply conduit, connected to the control unit and which adjusts the amount of coolant provided by said supply conduit; and - a second shut-off valve located in the outlet conduit, connected to the control unit and which adjusts the amount of coolant that is evacuated from the pipe circuit. - a liquefied natural gas regasification installation; - a cold room; and - a refrigeration installation connected to the liquefied natural gas regasification installation by means of a supply line of coolant at low temperature and configured to maintain the cold room at a certain temperature, the refrigeration installation comprising: - at least one air cooler, placed inside the cold room and which comprises a defrost system and a set of tubes, - a pipe circuit connecting an outlet of the set of tubes of the air cooler to an inlet of said set of tubes, for recirculating outputted coolant from the air cooler; - a pump, placed on the pipe circuit connected to the outlet of the set of tubes for moving the outputted coolant through the pipe circuit, - an adjustable three-way valve, located in the pipe circuit downstream the pump and connected to an outlet conduit in order to enable the evacuation of the outputted coolant that comes out of the pump, adjusting the amount of coolant that is maintained in the pipe circuit; - a supply conduit connected to the supply line of the LNG regasification installation and connected to the pipe circuit downstream the pump for introducing the coolant at a lower temperature than the outputted coolant that comes from the air cooler, thus producing a mixed coolant in the pipe circuit, - a control unit, connected with the air cooler, the pump, and the adjustable three-way valve; - a first shut-off valve located in the supply conduit, connected to the control unit and which adjusts the amount of coolant provided by said supply conduit; and - a second shut-off valve located in the outlet conduit, connected to the control unit and which adjusts the amount of coolant that is evacuated from the pipe circuit. - at least one air cooler, placed inside the cold room and which comprises a defrost system and a set of tubes, - a pipe circuit connecting an outlet of the set of tubes of the air cooler to an inlet of said set of tubes, for recirculating outputted coolant from the air cooler; - a pump, placed on the pipe circuit connected to the outlet of the set of tubes for moving the outputted coolant through the pipe circuit, - an adjustable three-way valve, located in the pipe circuit downstream the pump and connected to an outlet conduit in order to enable the evacuation of the outputted coolant that comes out of the pump, adjusting the amount of coolant that is maintained in the pipe circuit; - a supply conduit connected to the supply line of the LNG regasification installation and connected to the pipe circuit downstream the pump for introducing the coolant at a lower temperature than the outputted coolant that comes from the air cooler, thus producing a mixed coolant in the pipe circuit, - a control unit, connected with the air cooler, the pump, and the adjustable three-way valve; - a first shut-off valve located in the supply conduit, connected to the control unit and which adjusts the amount of coolant provided by said supply conduit; and - a second shut-off valve located in the outlet conduit, connected to the control unit and which adjusts the amount of coolant that is evacuated from the pipe circuit.