The T6 can be controlled from anywhere in the world. My home has a one AC unit for downstairs and upstairs. I have 2 T6 thermostats. They work great. I am able to keep upstairs warmer in the summer since it is not being used a lot and the downstairs is set perfect.
The thermostat in itself is okay, but it won’t work well with the app, so it can only be used at home manually. Tried reaching out to support, but they’re not reachable and hang. I would have chosen a different product if it wasn’t preinstalled in the home I purchased.
First of all, If you're trying to use your 5ghz connection to your wi-fi you can forget it, the thermostat can only join a 2.4ghz network. Lock your phone down to the 2.4ghz network for this install (reconnect automatically). The wi-fi installation of this device is NUANCED to put it mildly. The gyrations of connecting to the local wi-fi generated by the thermostat, then turning OFF your internet by going into airplane mode, then turning the internet back ON because the Honeywell Home app demands it is frustrating. At one point it said "connect to the thermostats network" and presented me with only the wireless network options, I was already connected so I hit BACK--well, there's no escape, I LITERALLY had to go in and REselect the Thermostat network for the app to realize it was connected. It was a lot of trial and error but eventually I got it connected to my 2.4ghz network, then managed to push forward to get it to register so it would have the weather, etc. I think 5ghz is common enough now that this is going to be a big issue w/people attempting to configure wi-fi themselves.