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Though the benefits of personal comfort systems as energy-efficient solutions for buildings are known, in-situ energy measurements and post-occupancy comfort analysis have been conducted to a limited extent. Moreover, occupants’ acceptance of these new energy-efficient technologies has not been deeply assessed. Both monitoring building occupancy and information on occupants’ expectations and attitudes regarding these devices can potentially help to optimize the implementation of personal comfort systems in non-residential buildings. Therefore, we investigate the effect of occupants’ expectations and knowledge on their acceptance and use of a personal ceiling fan and relate it to their satisfaction with the indoor environmental conditions. A mixed-methods research study is planned, consisting of both quantitative data from monitoring and a survey campaign in an office building in Germany and qualitative data from a series of interviews with building employees.