Have T6 upstairs, and another Honeywell thermostat downstairs. Not sure how they integrate but now have both in Resideo app and they are both working fine. Better in fact than the Nest units that we had at a prior home.
This "SMART" thermostat has an ugly gray/white screen like the first computers (compared to my previous beautiful Honeywell screen). I have tried all day to connect the mobile app which was unsuccessful! Further, it somehow deleted my Verizon connection on my mobile to all my other apps! Soooo expensive too! Wish I hadn't bought it!
No, I would not recommend this to a friend.
Response from resideo.comBy Support, January 27, 2023
Hi, this is not what you should expect. We will be happy to guide you through the registration and connection process on the Resideo app to make sure that everything is working as intended. Our team is ready to help! Visit the Support Center link at the top of the page for ways to get in touch.
A nightmare to set up. I had to summon the aid of a technical support agent at Honeywell. In my case, I needed the combination of two separate cellular devices and a screen share to configure the WIFI feature of the RESIDEO app.