Main purpose of the work carried out in this thesis activity is the use of the object-oriented approach for air conditioning systems modeling, including all the equipment that compose them, relatively to a residential apartment through the usage of the modeling environment Wolfram SystemModeler. After a short digression about the different approaches useful to modeling such systems and the presentation of some conducted works in the thermal physics field already existing in literature, the general concepts on the logic behind Modelica language, with which SystemModeler works, are exposed. By the application of such modeling tool, a case study concerning the heating of a building using a heat pump-to-fan coils system is implemented, through which is possible to focus the attention on all the theoretical aspects related to thermal and physical processes that characterize both its behaviour and operating, with the further aim to confirm the high convenience on the usage of such modeling approach thanks to the countless benefits that it is able to offer.