This ventilation and air conditioning system (20) is provided at least with: an air conditioner (9) for cooling air in an air conditioning room (18); a plurality of transporting fans (3a-3d) that are singly provided in a plurality of respective living rooms (2a-2d) isolated from the air condition room (18), and that transport the air of the air condition room (18) into the corresponding living room; and a system controller (10). The system controller (10) calculates, for each of the plurality of living rooms (2a-2d), a dew point temperature of each living room on the basis of the indoor temperature and the indoor humidity of each living room, determines the occurrence of condensation when the air of the air conditioning room (18) is transported to each living room on the basis of the calculated dew point temperature of each living room and the temperature of the air condition room (18), and controls the air volumes of the respective transporting fans of the respective living rooms in accordance with the determination results.
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