Abstract: In order to provide a method for the conditioning of air which is implementable in a reliable and energy-efficient manner, it is proposed that the method comprise the following: determining the actual values of at least two parameters of an inlet air stream of a conditioning system in which the air is to be conditioned; selecting an operating state of the conditioning system on the basis of a model by means of which a plurality of possible actual values of the at least two parameters is linked to operating states of the conditioning system; setting the conditioning system into the selected operating state so that an output air stream of the conditioning system is produced in which the actual values of the at least two parameters lie within preset target value ranges.