This bachelor´s thesis deals with the designing of air conditioning system for exhibition space of car showroom and spaces which are necessary for assuring of operation. The equipment is designed to meet the operational, functional and hygienic requirements for the internal microclimate. The main task of the device's coverage of heat loss in winter and heat gains during the summer and transportation of fresh air to the interior. The theoretical part deals with cooling in air conditioning. Calculation and project part contains three desings air-conditioning units to operate various parts of car showroom. The result of this work is the detailed design work of these equipments