I thought it would be complicated to use but it’s actually well designed so not confusing. I like I can lower the exterior temp I want the auxiliary heat to be used at because I don’t like for that to run at its own whim since it is not as efficient as the heat pump. I have a high efficiency system so it should be able to keep up at low temps but often the aux heat gets turned on if you make a large temperature swing more than 1.5 to 2 degrees so that it warms as quickly as possible…I don’t need that feature, I only want it if the system can’t keep up in the extreme cold and so I set it as such. Controls the variable speed communicating indoor and outdoor units nicely allowing them to operate at the highest efficiency possible. Other non proprietary thermostats only allow variable speed systems to run at one of two speeds which takes away from the high efficiency characteristics of a variable speed system that monitors the room temperature conditions as well as outdoor conditions to choose the best speed possible for the ultimate in energy efficiency. Only complaint is that it lacks showing what percentage of speed it is currently running at which would be nice to see but not required. So far it is doing a great job to maintain the set temperature and also quickly heat when the set temp is raised. I like that it has a 10 year warranty since it is a touchscreen “mini iPad” type device so I’m protected should it stop working for 10 years.

Excellent thermostat device while you are home and when you are away from home! You never have to wonder if your furnace is working while away from home in the winter, or if the air and dehumidifier are working when traveling in the summer! Simply check your phone app! The thermostat is user friendly, and very easy to set! I would definitely buy this thermostat again! It also allows the service associate to check your system out right at the thermostat! Great product!!!

The app and wall mounted interface are fancy looking but when you go to actually use them they are cumbersome to use and not intuitive at all. I never use the set temps because the system is so sensitive that it is constantly going on and off. Because it is right outside my bedroom it wakes me up all night long. I find it better to just turn the system off completely and if I’m cold or hot I turn it on and off manually to limit the noise. I realize this is supposedly less efficient than allowing the system to maintain the temp but it is too loud. I have asked multiple times if I can swap out the interface for a Nest thermostat and I have been told no…I’m really tempted to try and swap it out myself just because this thermostat interface is so not user friendly.

As several others have mentioned, if you have multiple zones, the UII will spontaneously jump back to the first thermostat in your list. The + and - temp buttons on all secondary zones don’t work. Instead it displays 0 as the new desired temp. You are forced to carefully use an analog simulated wheel to make the temp change and if you don’t perfectly select the wheel, the ui will panic and scroll back all the way to the first thermostat. There’s also the caching problem, where it lies to you. Sometimes, you can make changes and it throws them away. So, be sure to go back and check a few minutes later.Somewhat related to the caching problem, the system will not allow you to leave the fan running all the time. Well the UI will tell you that it’s set to on, but as soon as your next scheduled event occurs, it takes over the fan again and sets it to auto. So, if you want to follow the guidance of your HVAC installer and leave the fan running 24/7, you can’t use schedules. There’s no way any executive at the company uses this app. I wonder whose HVAC system they use, I should switch to one that works.