An air conditioning apparatus (1, 1a) for conducting air conditioning by changing a state of refrigerant, comprising: a heat source unit (2, 2a) including a heat source side compressor configured to compress the refrigerant, a heat source side heat exchanger configured to conduct heat exchange of the refrigerant, a heat source side expansion mechanism configured to decompress the refrigerant; a first utilization unit including a first utilization side compressor configured to compress the refrigerant, a first utilization side heat exchanger configured to conduct heat exchange of the refrigerant and a first utilization side expansion mechanism configured to decompress the refrigerant; a second utilization unit including a second utilization side compressor configured to compress the refrigerant, a second utilization side heat exchanger configured to conduct heat exchange of the refrigerant and a second utilization side expansion mechanism configured to decompress the refrigerant; and a refrigerant communication pipe configured to connect the heat source unit and both of the first and second utilization units; characterized in that the heat source unit (2,2a) includes a heat source side four-way switch valve configured to cause the heat source side heat exchanger to function as a condenser and an evaporator; the first utilization unit further includes a first utilization side four-way switch valve (V6a) configured to cause the first utilization side heat exchanger to function as a condenser and an evaporator; in that the second utilization unit further includes a second utilization side four-way switch valve (V6b) configured to cause the second utilization side heat exchanger to function as a condenser and an evaporator and by a control section configured to control the first utilization side compressor and the first utilization side expansion mechanism and the first utilization side four-way switch valve in accordance with operation load of the first utilization unit and configured to control the second utilization side compressor, the second utilization side expansion mechanism and the second utilization side four-way switch valve in accordance with operation load of the second utilization unit. a heat source unit (2, 2a) including a heat source side compressor configured to compress the refrigerant, a heat source side heat exchanger configured to conduct heat exchange of the refrigerant, a heat source side expansion mechanism configured to decompress the refrigerant; a first utilization unit including a first utilization side compressor configured to compress the refrigerant, a first utilization side heat exchanger configured to conduct heat exchange of the refrigerant and a first utilization side expansion mechanism configured to decompress the refrigerant; a second utilization unit including a second utilization side compressor configured to compress the refrigerant, a second utilization side heat exchanger configured to conduct heat exchange of the refrigerant and a second utilization side expansion mechanism configured to decompress the refrigerant; and a refrigerant communication pipe configured to connect the heat source unit and both of the first and second utilization units; characterized in that the heat source unit (2,2a) includes a heat source side four-way switch valve configured to cause the heat source side heat exchanger to function as a condenser and an evaporator; the first utilization unit further includes a first utilization side four-way switch valve (V6a) configured to cause the first utilization side heat exchanger to function as a condenser and an evaporator; in that the second utilization unit further includes a second utilization side four-way switch valve (V6b) configured to cause the second utilization side heat exchanger to function as a condenser and an evaporator and by a control section configured to control the first utilization side compressor and the first utilization side expansion mechanism and the first utilization side four-way switch valve in accordance with operation load of the first utilization unit and configured to control the second utilization side compressor, the second utilization side expansion mechanism and the second utilization side four-way switch valve in accordance with operation load of the second utilization unit.