AIR CONDITIONING SYSTEM AND BUILDING

PROBLEM TO BE SOLVED: To provide an air conditioning system capable of efficiently discharging water, such as dew condensation water generated through the air conditioning, and polluted water generated from an air-liquid contact type air purifier.SOLUTION: An air conditioner 3 is installed in a building 1. In the air conditioner 3, an indoor unit 3A of the air conditioner, as an air-conditioning body device having the cooling/heating function and the dehumidifying function on the downstream side, and an air washer 3B, as an air-liquid contact type air purifier on the upstream side, are connected to each other in a ventilating manner. A branch drain 12A, provided in the indoor unit 3A of the air conditioner, and a branch drain 12B, provided in the air washer 3B, are merged with each other in a common drain 12.