Great upgrade from the original thermostat. Love the touch screen and the convenience of the control from my phone. The ONLY issue is that is sometimes has connectivity issues and the router is 15ft away.
Very glitchy when it comes to connecting with internet and phone app. Specifically bought this to be able to control remotely through the app and it frequently disconnects. Would not recommend
This is not a wire it in and forget it thermostat. If you read all instructions, it will lead you through the setup step by step. If you ignore the instructions, you have your work cut out for you. I have installed over 200 T6 thermostats, and have only had an issue with one, and I believe that was caused by abuse from the customer. To sum it up, I can stock my HVAC service truck with any thermostat in the world. I, and all of my colleagues choose Honeywell T6’s.
We had a VERY difficult time setting up and troubleshooting the T6 with our wifi - which I'm told is not common - Honeywell engineers finally manually connected for us - since then it's worked great and we're very happy we have it.
I'd never had bought this if I had read the reviews beforehand. The thermostat itself works fine, but getting the app (Android in my case) working took a couple of hours and fiddling with my wifi router. If you aren't a router fiddler, and understand the phrase "2.4 Ghz band and not the 5 Ghz band", this may not be for you. After googling and trying several things, the app finally connected to the termostat, for some unknown reason, and it's been working since then. We did have one incident where what the app was showing was NOT what the thermostat screen was showing, and trying to change the temperature setting with the app didn't work, but we haven't seen that again. WARNING: It seems that the app connects NOT to the thermostat itself, but to a server somewhere on the internet, because we can read and change the settings from the app even when we are not home! I presume that the thermostat is connecting to that same server, which means its is exposed, at least in some way, to the internet. And this means someone might conceivably HACK this thing. That's a little scary, and if I ever think it has happened, I'll rip it out.