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One of our Post Graduate is working on the study of Mixed Mode Shopping malls. Recent years have seen new trend evolving in the design of shopping malls in Malaysia, from the fully air-conditioned conventional malls to the newly designed ones which integrates passive design strategies. These passive strategies are implemented to reduce energy consumption and also to improve the indoor environment. The need to reduce energy consumption is indeed necessary considering the fact that the ‘residential and commercial’ sectors are the highest electricity consumption in Malaysia. On the other hand, quality indoor environment safeguards occupants’ health; which is one of the reasons studies revealed influences certain shopping behavior. Notwithstanding, shopping still constitutes the most popular and affordable forms of outing among Malaysians and Malaysians have been revealed to spend sizeable amount of their time in the mall. There is therefore a need to study the Indoor Environmental Quality (IEQ) of Malaysia’s shopping malls. This research will study IEQ performance of two shopping malls selected based on their mode of ventilation (fully air-conditioned and hybrid ventilation system). All IEQ factors will be put into consideration, both objective and subjective measurements will be carried out. Results from this study will shed more light on occupants’ expectation and concern for their IEQ. By comparing results from the two case studies, this study will inform architects, designers, planners and managers on how different building design features and technologies may improve IEQ, affect occupant comfort, and also their satisfaction. Consequently, more opportunities will be opened for future IEQ studies to be carried out in hot-humid climatic regions particularly in Malaysia. The study commenced in 2015 and expected to end in 2017