A control system includes a manual-type air conditioner, and a control device which causes the manual-type air conditioner to execute remote air conditioning in response to a command from outside of a vehicle. The control device starts actuation of the manual-type air conditioner with a maximum temperature as a target blowout temperature of an air-conditioning air and a maximum air quantity as a target air quantity in response to a trigger command of the remote air conditioning, and gradually changes and reduces the target air quantity while gradually changing the target blowout temperature toward a target intermediate temperature with elapse of time. The control device changes the target blowout temperature and the target air quantity respectively to a set blowout temperature and a set air quantity at a time of previous disembarkment, when boarding of a user to the vehicle is detected.