Contact S40 L40 Smart T Stat Support

by Cftredt

This thermostat and app are terrible. In fact anyone considering the purchase of a Lennox AC would be well advised to thoroughly investigate the thermostat first. It might be enough of a deterrent to redirect your choice of AC units. We have found our thermostats to not be accurate on temperature measurement and hopefully can be recalibrated. The thermostat does not always accept and keep the temperature that is set for control. Also, we have seen the app display one room temperature only to have it immediately jump to a different temperature when we go to make a control setting change on the app. We just had 2 new AC units and corresponding thermostats installed 2 days ago. I do not believe these opinions are based on an unfamiliarity with the thermostats as we previously had the previous but similar S30 version on our older Lennox units.

Update - after about a month my feelings are almost the same. Learning to live with this garbage. Why do companies think they have to fix things that aren’t broken? This ‘new and improved’ thermostat was about like the message you get when you open an app - “you have an update”.

by Xoxo,hello

Sadly, Lenox is known for its many technical issues. They are also known for releasing their products before they are ready for prime time. This new s40, or i40 thermostat with the app only works have the time. For four of my 12 zones it works once every four months. I have to manually go to the main thermostat controller and adjust it. The service technicians at 1-800 Lenox are pleasant enough. That is, Once you get through to them. They do try to help guide you, at least the ones I have had, however they can’t fix the issues. So what good are they then? I have call the installers and they not only charge for a service call, understandable, but they are charging an additional $25 for gas! That should be their cost of doing business. Please do yourself a favor and NEVER purchase a Lenox HVAC system. NEVER. Many better companies, like Carrier and Trane. I so so so wish I had never gone forward this company. Always having issues.

by DRM49

This thermostat is so unhandy to use I can’t believe Lennox actually sells them. I had a new system installed two weeks ago including this thermostat and I still can’t get it to work as advertised. It is very hard to read the instructions on the thermostat because they are so small and faint. It is supposed to be able to be made brighter but I can’t figure out how. There were no instructions with the unit but I did find a 50 page set on line. A little hard to read the instructions on phone while trying to set thermostat. I thought I was supposed to be able to set up schedules on thermostat and change temperature schedule temporarily from my phone but I don’t see how to do that. I tried to change some settings from the thermostat but now it is locked up. I called the dealer and I hope they can fix it. After reading other reviews I am not confident that it will ever work as advertised.