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This paper presents a conceptual design of a multizone HVAC controller based on a wireless sensor network that aims to optimize energy consumption while maintaining the comfort level of users. The proposed system is capable of learning the occupancy pattern of the residents in the building. Moreover, it is transparent (requires no manual configuration). Wireless sensor network technology is used to collect the required measurements for the control system, simulation results are used to demonstrate the system performance in terms of power consumption and comfort level Additionally, a comparison between the proposed system and other HVAC control systems is presented. The results show that the proposed system is capable of providing a major energy savings.