What’s the difference between the ecobee3 and the ecobee3 lite?

The ecobee3 lite does not support accessories (HRVs, ventilators, humidifiers, and dehumidifiers). However, you still get all the same smart functions offered by the ecobee3, such as Smart Recovery, scheduling, and Smart Home/Away. As of March 21, 2017, the ecobee3 lite now also supports room sensors. 

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For more details, explore the ecobee3 lite features.