The Szentágothai János Research Center in Pécs brings computer based building physics simulations to reality closer than ever. This high class building ads ground to several medical research programs and lectures, but it also gives a rare opportunity to improve computer simulations with its’ Building Management System (BMS from now on). The system does not only allow the complex building services system to be remotely controlled from a single computer, but also gathers important data related to the buildings’ physical performance, for example: room temperatures; air flow rates; geothermal pipe performance; and energy consumption of heat pumps. By comparing the results of a zone based building physics simulation model of the building, enhancement of the precision of the simulations and optimization of the actual buildings energy consumption can be done, by trying out different maintenance strategies.The first step is to build the computer model to be as precise as possible. In the zone based physical model, energy flows between zones, but the zones themselves often lack precise physical attributes, like energy loss through heat bridges. In this paper we will show how 2D finite element heat transfer simulations improve, zone base whole building simulations.