An HVAC system contains heating, ventilation and air conditioning equipment used in office or industrial buildings. The goal of this research is to design a controller for the process of cooling an office building that is made up of three rooms. The desired room temperature can be achieved by controlling the fans making up the fan coil units and the cooling medium’s temperature. By these means the building connected to the electrical grid becomes a smart office. The used building model includes several dynamically changing interior and exterior heat sources affecting the inner climate, which introduces a level of uncertain prediction into the system. We have determined the controller’s performance by the rate of deviation from the expected temperature, the consumed electrical energy and the generated noise. The controller was created in Matlab Simulink with the possibility of migration to a Siemens PLC.
 Mustafaraj G., Chen J., Lowry G.: Development of room temperature and relative humidity linear parametric models for an open office using BMS data. Energy and Buildings, 42/3. (2010) 348-356. https://doi.org/10.1016/j.enbuild.2009.10.001
 Hobaj Zs.: Modell alapú épületautomatizálás. Diplomadolgozat, Sapientia Erdélyi Magyar Tudományegyetem (2018).
 Xiang-Dong H., Harry A. H.: Heating, ventilation and air conditioning (HVAC) system and method using feedback linearization. US 10701799, U.S.A., 2003.
 Norman B. G., William E. C., Jr.: Room temperature controller. US 4318508A, U.S.A., 1982.