This thermostat does what it’s supposed to do well, in the sense that it will make the temperature in the house warmer or cooler. However, I have two issues with it. One is just a matter of getting used to in that the temperature of my house feels two degrees cooler than what the thermostat displays. I solved this problem by adjusting the setting up by two degrees. The lack of a vacation mode is more problematic, and this matters less on departing than on returning home. It can take a solid 24 hours to bring the house to the right temperature after a trip. In winter I set it to 55 degrees and in summer I set it to 85 degrees. I want to program the heating or cooling to begin the day before I get home and to set this up before I leave. I don’t want to have to remember to pull out my phone to adjust this a day before returning home. It should be automated and that’s easy enough to program, but it does not allow this unfortunately. I hope this becomes possible in the future!

The new app is so slow and has caused the previous app to be even slower. It has extra steps that waste time it’s cloudy and is so slow. It takes about 30 seconds for it to kick in after it’s grayed out and then the next step takes another 30 seconds is a long delay the class slow and the scrolling is not good and then when you set the time it goes back to the original time and you have to wait for it to make sure that it stays on the correct temperature before you go to the next room I have no confidence in it. I’ve set the time many times and then it doesn’t set the time and you have to be paranoid to go back to check. It’s unreliable. It’s a step backwards from the previous app. This app is a step backwards so many extra steps, not well-thought-out and time wasting, is someone going to do anything about it and let customers know when you’re going to redo it or improve it? Unreliable, set temp, but reverts back to previous temperature, have to triple check through clunky extra tike wasting steps because I no longer trust it and have to repeatedly set the desired temperature. Customer service and communicating with Lennox is not easy, who knows if the corporate office knows about the issues and how this new app is not an improvement.

I have three M30 thermostats and two Lennox heat pumps. One system has two zones. They were installed two years ago. At the time there were two Lennox apps that were compatible with my M30's. The one that is now end-of-life'd, and this one. The EOL'd app's UI was almost identical to the physical thermostats, and fairly intuitive. The older version of this app would leave the WiFi in the thermostat turned on, overheating the thermostat. I'd see it register 90F when the room was only 65F. So the old app was perfect when paired with an M30 thermostat. That app is now dead. It refuses to let you get past the startup screen telling you to switch to this app. So I switched. Fortunately, they seem to have fixed the WiFi overheat issue. But the UI of this app is very different from the thermostat, and has outright workflow errors. Away mode disables access to fan mode settings. Changing a fan setting pops back to the previous menu rather than staying on the fan settings screen. I found those sausages after using the app for just one day. So 2 stars because the app at least seems to connect reliably and allow control of my 3 zones and two systems. No more stars because it's a significant step backwards in user experience.

Coming from an our old house with an S30, we just replaced a poorly installed contractor grade York system in a one YO new construction home with a Signature series Lennox system coupled with the S40 thermostat. S40 certainly seems more robust and consistent than our old S30 when it comes to communication links and initial setup. I did like the Home Screen UI on the S30 better as it gave more at glance info for the mode the system was operating in or what schedule was being used, if the system was ramping between points, etc. On the S40, I have to dig thru menus to figure out those same settings. The info is there but it’s just not intuitive. My biggest ding on the S40 in comparison to the S30 are the number of steps allowed in schedules. The S40 limits schedules to 4 steps throughout the day. That’s very limiting and impractical given todays reality of daily routines coupled with dealing with power company peak and non-peak rates.