To provide a multifunctional air conditioning system maintaining energy-saving, conducting cooling and heating, ventilation, humidity control, and air purification with sufficiently adjusting capability for and not affected by an air quality state inside or outside a room, capable of free selection according to numbers or kinds of rooms and purposes of air conditioning, and with simple and inexpensive construction in an air conditioning apparatus used for cooling and heating, ventilation, and the like inside a room.

The system comprises inducing indoor air 8, heating and cooling, and ventilating by an indoor side heat exchanger 2 by a method wherein outside air is pressed and introduced by compressed air-supplying means 13 provided inside an outdoor unit 14 to an indoor unit 1 and allowed to blow off from an induction ventilation apparatus 3 provided inside the indoor unit 1. The system is provided with humidity-control means 2, 7 and indoor air-purifying means 2, 3, 4. Thereby energy-saving is obtained, and operation is not affected by an air quality state inside or outside a room, and selection according to numbers or kinds of rooms and purposes of air conditioning is freely available, and simple and inexpensive construction is realized.