A dehumidifier, comprising: an outer case having a first inlet hole, a second inlet hole, a first outlet hole, and a second outlet hole; a first draft fan configured to move air from the first inlet hole to the first outlet hole; a second draft fan configured to move air from the second inlet hole to the second outlet hole; an evaporator configured to remove moisture included in the air inlet from the first inlet hole; a compressor configured to compress refrigerant evaporated at the evaporator; a first condenser disposed at a moving path of the air moved by use of the first draft fan; a second condenser disposed at a moving path of the air moved by use of the second draft fan; and an expansion apparatus configured to expand the refrigerant condensed at the first condenser or the second condenser, characterized in that an exit of the evaporator and an entry of the compressor, an exit of the compressor and an entry of the first condenser, the exit of the compressor and an entry of the second condenser, an exit of the second condenser and the entry of the first condenser, the exit of the second condenser and an entry of the expansion apparatus, an exit of the first condenser and the entry of the expansion apparatus, and an exit of the expansion apparatus and an entry of the evaporator each are connected by use of a conduit, the conduit connecting the exit of the compressor and the entry of the first condenser is provided with a first compressor-exit-valve disposed thereto, the conduit connecting the exit of the compressor and the entry of the second condenser is provided with a second compressor-exit-valve disposed thereto, the conduit connecting the exit of the second condenser and the entry of the first condenser is provided with a first condenser-exit-valve disposed thereto, and the conduit connecting the exit of the second condenser and the entry of the expansion apparatus is provided with a second condenser-exit-valve disposed thereto. an outer case having a first inlet hole, a second inlet hole, a first outlet hole, and a second outlet hole; a first draft fan configured to move air from the first inlet hole to the first outlet hole; a second draft fan configured to move air from the second inlet hole to the second outlet hole; an evaporator configured to remove moisture included in the air inlet from the first inlet hole; a compressor configured to compress refrigerant evaporated at the evaporator; a first condenser disposed at a moving path of the air moved by use of the first draft fan; a second condenser disposed at a moving path of the air moved by use of the second draft fan; and an expansion apparatus configured to expand the refrigerant condensed at the first condenser or the second condenser, characterized in that an exit of the evaporator and an entry of the compressor, an exit of the compressor and an entry of the first condenser, the exit of the compressor and an entry of the second condenser, an exit of the second condenser and the entry of the first condenser, the exit of the second condenser and an entry of the expansion apparatus, an exit of the first condenser and the entry of the expansion apparatus, and an exit of the expansion apparatus and an entry of the evaporator each are connected by use of a conduit, the conduit connecting the exit of the compressor and the entry of the first condenser is provided with a first compressor-exit-valve disposed thereto, the conduit connecting the exit of the compressor and the entry of the second condenser is provided with a second compressor-exit-valve disposed thereto, the conduit connecting the exit of the second condenser and the entry of the first condenser is provided with a first condenser-exit-valve disposed thereto, and the conduit connecting the exit of the second condenser and the entry of the expansion apparatus is provided with a second condenser-exit-valve disposed thereto.