A highly intelligent thermostat with over 125 configurable settings to control the efficiency of HVAC systems, the EcoInsight™ calculates room comfort by aggregating data like time of day, solar load, brightness, humidity, and occupancy patterns. It determines when a space is occupied or vacant and reverts to preset temperature limits or engages the integral patented Recovery Time™ algorithm to limit temperature drift, maximize equipment life, and maintain occupant comfort while reducing energy consumption. The thermostat is equipped with a ZigBee® transceiver to create a wireless mesh network that communicates with a myriad of wireless building control devices and the cloud-based EcoCentral Virtual Engineer™ Command Center. The EcoSmart network also can be fully integrated with BACnet® control devices and equipment. Internal data loggers measure over 40 various runtime metrics, and, when linked to EcoCentral Virtual Engineer, can produce room and site-wide detailed measurement, verification, and analytics. The thermostat can be installed on packaged terminal air conditioners, fan coils, heat pumps, split systems, and more.