The primary differences between the legacy Ecobee4 and the Ecobee3 Lite center on built-in voice assistant capabilities and hardware accessories: The Ecobee4 features a built-in Amazon Alexa speaker and microphone, allowing you to use it as an active smart speaker, and historically included one remote room sensor in the box. The Ecobee3 Lite omits built-in Alexa voice speakers and does not include a room sensor in the standard retail box (though it remains fully compatible with optional separate sensors). Both share identical core heating and cooling control software. Verification: Check the product packaging and feature specifications to confirm whether your model includes built-in voice speaker hardware.
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