I have purchased the T9 and also 3 sensors. I really like the features of having the sensors so that I can target zones. I also like having access to the app to make changes to the schedule or check on things. What the APP and T9 is missing is historical data to see how the temp progressed through the day and night. When the heat was activated and when the heat was shut off so that I can see how often the furnace is used during the day and night. I can then use this data to adjust my schedule and temps so that I save energy.
If you have two of these at two different homes the weather will only display for the zip code you set up in the app. Otherwise it’s a great working thermostat
I have the T9 with 4 remote sensors easy set up , BUT I gave it 2 stars because it did not come with a mud ring or offset if you are replacing a larger in size thermostat and I have the thermostat is connected to a zone board connected to a geo unit there is no instructions for this option you have to figure that out on you own , no descriptions on the modes to help figure how this thermostat operates, not able to fine tune temperature set points like I want. Example I want a set point of 72 on at 71.3 and off at 72.4 to prevent on and off this is not good for a geo unit
I am very happy with the Thermostat. I was not sure that I needed a Wi-Fi thermostat but I’m glad I bought it. It will definitely save electricity and energy. Great features on this unit.