It works but is a bit flaky. Forgets your settings. Can't rely on the not home feature. Thinks you're gone when you are home. Switches the sensors without you wanting to for primary. Not sure it was an improvement over my gen 1 Nest.
Great product. Really like the remote sensors that allow the unit to run based on a different location of thermostat. Wish the remotes would display local temps
Easy to install. instructions were very clear. Needed to add a C wire and luckily my wiring had extra unused wires so I didn't need the adapter. Had some difficulty connecting to the wifi and app but eventually was successful. Works great. Navigation on menus could be better though.
Overall works as expected. The geofencing seems to work quickly when I'm away , but slowly once I'm home. Sometimes not even realizing I'm home until I access the home internet
The t9 pro is the way go if u are buying a thermostat that can do multi room sensing. It is extremely easy to set up and the included adapter can even get older systems with no remote power wires up and running. It is reliable and extremely easy to program, syncing extra room sensors are a breeze also.
The T9 was easy to install on our new Trane system, and the phone app was easy to initiate. The best thing about it is the secondary thermostat. The worst thing about it is that the settings do not allow it to get dim enough. We ended up getting some "Dim It" film strips to darken it enough to sleep.
I had a friend who is an H/A tec install it. He could not get the heat pump heating working. I have to use “emergency heat”. He is researching how to fix it.