The primary differences between the original Ecobee3 and the Ecobee3 Lite center on included room sensors and accessory terminal inputs: The original Ecobee3 included one remote SmartSensor in the retail box and featured extra accessory terminals to support auxiliary devices like humidifiers, dehumidifiers, or ventilators. The Ecobee3 Lite omitted remote sensors from the base package and simplified the backplate wiring terminals by removing accessory control ports, creating a lower-cost entry model. Verification: Check the product packaging and backplate wiring terminals to confirm whether your model supports auxiliary accessory devices.
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