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!

Update: At least add humidifier status on the main page like the old app has. I do see heating and cooling icons/activity on the main page, so why not humidifier activity? One less tap to see it.As I said below, this version adds NOTHING of benefit for the user. EVERYTHING takes more taps/swipes. Poor UI. This new app works fine for me. I was able to log in with my existing account and it connected without issue. The data appears without issue. Here’s the problem: it doesn’t do ANYTHING better than the old app. In fact, if you have multiple furnaces/AC, it is LESS convenient than the old app which allows you to swipe left/right to view the different units. Why do companies feel compelled to change an app that works? Listen to your customers and not your app developers who only want to make money and change for the sake of change. This is a tool and if it works don’t change it. If there technical issues, then fix those. I wish companies would learn that people want reliable functionality from an app along with ease of use. This new app is NOT easier to use any way and doesn’t provide additional functionally. This app makes it harder to view much of the data by requiring additional clicks and swipes. That’s my opinion, and I doubt Lennox will take away anything from it sadly.

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.

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.