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I have also installed one Eco4 and yes it can work.
Sorry, there was a problem. Please try again later.Not sure if you still need an answer, but the Ecobee 3 lite should work just fine with the voice control on the 4. The 4 and 3 won't work together to optimally cool - each will have their own set programs and sensor networks that work independently. You could use the voice control on the 4 to have Alexa change the downstairs programming.
Sorry, there was a problem. Please try again later.Yes, I have one 4 and two 3s. Even though they are in different houses still works.
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