Global warming increases in spring and summer temperature as well as the high percentage of glazing feature of educational building are resulting in high thermal gain and indoor air temperatures. As a result of this occupant tend to adjust their seating to overcome this internal heat island effect resulting in an overload on the air conditioning, if present, in different zones. This research aims to bridge the gap between energy performance of buildings and occupants’ habitual adaptive behavior educational buildings. Data, indoor and outdoor temperatures, from a representative educational building in the City of London were collated and analysed. The building fabric thermal performance for the case study building was modelled and simulated by using the Integrated Environmental Solutions (IES) software suite. The findings revealed that different parts of lecture rooms have reached temperature which are beyond the acceptable limit during the summer and even when mitigating actions were used such as air movement fans and opening of the windows the overheating was still significant. This was difficult to pick in the modelling and was only picked in the actual data monitored.