An air conditioning system provided with a heat exchanger unit, including a use side heat exchanger, that generates conditioned air through heat exchange in the use side heat exchanger and supplies the conditioned air to an air conditioned space through a plurality of distribution flow paths that communicate with the heat exchanger unit, comprising: a controller; a plurality of ducts configured to distribute the conditioned air passing through the use side heat exchanger of the heat exchanger unit; a plurality of fan units provided in correspondence with the plurality of ducts and configured to supply the conditioned air from the heat exchanger unit to the air conditioned space through the plurality of ducts; and a plurality of actuators configured to be changeable an air supply amount of the conditioned air to be supplied to the air conditioned space, wherein each of the plurality of ducts is disposed in one of the plurality of distribution flow paths, each of the plurality of fan units includes a first fan and is disposed in one of the plurality of distribution flow paths, each of the plurality of actuators is disposed in one of the plurality of distribution flow paths, and the controller configured to control the plurality of actuators to control the air supply amounts of the plurality of fan units, whereby the heat exchanger unit includes a second fan, characterized in that the controller includes a main controller that is configured to control the plurality of actuators in accordance with a plurality of instructions related to the air supply amounts of the plurality of fan units, and a plurality of sub-controllers that receive the plurality of instructions transmitted by the main controller and control the plurality of actuators, and the main controller is configured to control the second fan to be a predetermined output with respect to a total combined air supply amount indicated by the plurality of instructions. a controller; a plurality of ducts configured to distribute the conditioned air passing through the use side heat exchanger of the heat exchanger unit; a plurality of fan units provided in correspondence with the plurality of ducts and configured to supply the conditioned air from the heat exchanger unit to the air conditioned space through the plurality of ducts; and a plurality of actuators configured to be changeable an air supply amount of the conditioned air to be supplied to the air conditioned space, wherein each of the plurality of ducts is disposed in one of the plurality of distribution flow paths, each of the plurality of fan units includes a first fan and is disposed in one of the plurality of distribution flow paths, each of the plurality of actuators is disposed in one of the plurality of distribution flow paths, and the controller configured to control the plurality of actuators to control the air supply amounts of the plurality of fan units, whereby the heat exchanger unit includes a second fan, characterized in that the controller includes a main controller that is configured to control the plurality of actuators in accordance with a plurality of instructions related to the air supply amounts of the plurality of fan units, and a plurality of sub-controllers that receive the plurality of instructions transmitted by the main controller and control the plurality of actuators, and the main controller is configured to control the second fan to be a predetermined output with respect to a total combined air supply amount indicated by the plurality of instructions.