A magnetic refrigerator assembly, comprising: a first magnetocaloric stage (4 1) configured to operate with a first temperature span, and arranged to receive a first heat transfer fluid for flow therein; a second magnetocaloric stage (4 2) configured to operate with a second temperature span, arranged to receive a second heat transfer fluid for flow therein, and arranged in parallel relationship to the first magnetocaloric stage; wherein the first and second temperature spans are substantially the same but the absolute temperatures of the cold ends of the first and second magnetocaloric stages are different and/or the absolute temperatures of the hot ends of the first (4 1) and second (4 2) magnetocaloric stages are different; characterized in that each of the first and second magnetocaloric stages have a respective cold side and hot side, each of the first and second magnetocaloric stages including include a hot side heat exchange circuit, and each of the first and second magnetocaloric stages include a cold side heat exchange circuit; in that the hot side heat exchange circuit is configured to allow a first heat exchange fluid to pass first in thermal contact with the hot side of the first magnetocaloric stage (4 1) and then in thermal contact with the hot side of the second magnetocaloric stage (4 2), wherein, with the first heat exchange fluid passing therethrough, the temperature of the hot side of the first magnetocaloric stage is lower than that of the hot side of the second magnetocaloric stage; and in that the cold side heat exchange circuit is configured to allow a second heat exchange fluid to pass first in thermal contact with the cold side of the second magnetocaloric stage (4 2) and then in thermal contact with the cold side of the first magnetocaloric stage (4 1), wherein, with the second heat exchange fluid passing therethrough, the temperature of the cold side of the second magnetocaloric stage is higher than that of the cold side of the first magnetocaloric stage. a first magnetocaloric stage (4 1) configured to operate with a first temperature span, and arranged to receive a first heat transfer fluid for flow therein; a second magnetocaloric stage (4 2) configured to operate with a second temperature span, arranged to receive a second heat transfer fluid for flow therein, and arranged in parallel relationship to the first magnetocaloric stage; wherein the first and second temperature spans are substantially the same but the absolute temperatures of the cold ends of the first and second magnetocaloric stages are different and/or the absolute temperatures of the hot ends of the first (4 1) and second (4 2) magnetocaloric stages are different; characterized in that each of the first and second magnetocaloric stages have a respective cold side and hot side, each of the first and second magnetocaloric stages including include a hot side heat exchange circuit, and each of the first and second magnetocaloric stages include a cold side heat exchange circuit; in that the hot side heat exchange circuit is configured to allow a first heat exchange fluid to pass first in thermal contact with the hot side of the first magnetocaloric stage (4 1) and then in thermal contact with the hot side of the second magnetocaloric stage (4 2), wherein, with the first heat exchange fluid passing therethrough, the temperature of the hot side of the first magnetocaloric stage is lower than that of the hot side of the second magnetocaloric stage; and in that the cold side heat exchange circuit is configured to allow a second heat exchange fluid to pass first in thermal contact with the cold side of the second magnetocaloric stage (4 2) and then in thermal contact with the cold side of the first magnetocaloric stage (4 1), wherein, with the second heat exchange fluid passing therethrough, the temperature of the cold side of the second magnetocaloric stage is higher than that of the cold side of the first magnetocaloric stage.