Just sent this:
I’m considering replacing my thermostat. I’m intrigued by your product, but I am worried about my privacy. Can you point me to a document that describes, in detail, 1. which exact information the thermostat “sends home” to Google or anybody else outside of my home, and under which circumstances, 2. how to disable such sharing, and 3. what mechanisms you have in place to make sure the above doesn’t change without me understanding the change before you update software on the device, which I’m sure you do from time to time.
I’m not expecting a meaningful reply, but then, I hope I’m wrong.