The present disclosure relates to: a method for screening for an antimicrobial agent capable of controlling microorganisms causing offensive odor in an air conditioning apparatus； and a method for removing offensive odor in the air conditioning apparatus. The microorganism causing offensive odor in the air conditioning apparatus, of the present disclosure, can be used in the development of a novel antimicrobial agent or in the development of an aromatic for blocking offensive odor by establishing the chemical properties of metabolites of the microorganisms. In addition, there are various industrial applications such as a use for fundamentally removing the cause of offensive odor by creating, in advance, an environment in which the microorganisms cannot live in the air conditioning apparatus.
