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ZigBee is a wireless technology developed as an open global standard to address the unique needs of low-cost low-power wireless sensor networks. This standard takes full advantages of the IEEE 802.15.4 physical radio specification and operates in unlicensed bands worldwide at different frequencies. ZigBee-Wireless Mesh Networks (ZigBee-WMNs) are recognized as a cost-effective and flexible solution for building automation and control. They have the potential to unify the methods of data communication for sensors, actuators, appliances, and asset-tracking devices. They offer a means to build a reliable but affordable network backbone that supports battery-operated devices with a low data rate and a low duty cycle to facilitate building automation and control systems (BACs). This paper illustrates the possibilities and advantages of applying ZigBee-WMNs in BACs to benefit building occupants.