Comparison between measured and simulation- predicted indoor climate often displays a huge mismatch. In many cases, this gap can be attributed to occupancy behaviour like operation of shading system or window opening. On the one hand, technical effort for recording all occupancy schedules is very high and the only way to detect occupancy schedules properly. Otherwise it would be preferable to have a rough impression of occupancy behaviour and thus a satisfying accordance of simulation models and measurements also for low-budget monitored buildings. The suggested method is able to compensate this lack of measurements by means of a simulation study system and supporting spot tests. Measurements and simulations were performed in several ward zones of a hospital building. Occupant behaviour was approximated by the mentioned method. Thus, linear correlation between measured and simulated air temperature values was raised from 0.43 to 0.75 [-]. Spotted occupancy schedules are much more faithful than initially assumed.