Doesn’t keep temp settings
No matter what I set it to , the system will adjust on its own. I am away and set it to 82. Then a day later it decides it wants to cool my house to 68. While I’m not there and it’s 115 outside. I hate this thermostat.
Dissatisfied user after 8 years
The new app did not work as well as the old app
Can’t connect most of the time
Recently I have been experiencing connection issues with one of my thermostats. Very rarely it will be able to connect to the app, but 99/100 times it won’t. So frustrating!
Love the system
For modulating gas furnace with variable speed blower like the SLP99UH070XV36B-02, it would be nice to be able to see the system demand on the panel. Is this something that could be added?
Awful UX
Why has Lennox not offered a formal feedback mechanism after all of these years? Email, ticketing system, etc. And why do customers go months without any form of update? This all should be updated weekly.
App gets stuck often
This app gets stuck and won't adjust the temperature. This is especially important when I'm not home. It's annoying when I'm at home but a distance away from the thermostat and have to get up and actually go to the thermostat at 3am. 😕
Smart Away Isn’t Very Smart
Other apps with geofences work properly. Smart Away only works about a third of the time. It is totally unreliable.
Does not turn of ventilation when I choose timer in ASHRAE
Does not turn of ventilation when I choose say 2 hours countdown timer in Installer ASHRAE settings. The old Lennox app did is superb for this settings but this new Lennox Home app does not work as intended. I stood at attic and in this Lennox Home app I chose Installer Settings ASHRAE and it OPENS THE VENT even though countdown timer is not chosen by me. I had huge electric bill last month as ventilation was in ASHRAE that kept vent open and my ac was running all day. I thought it was due to super hot Dallas July 2026 summer but I went to attic and shocked to see vent was open as you guys forced us (many homeowners in our community) to use this new Lennox Home app. The other older app did not do. I have video taken in 2024. Pls fix it.
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So the ratings are up
So Lennox front end controls via the app and web browser—it’s all improved from 4 years ago where it just did not work remotely. So back then it was get used to being home and walking up to your thermostat to change literally anything. But it’s still periodically buggy enough to drive you mad. I would never have go to their closed proprietary systems with $1200 thermostats had I known what I know now. The actual physical condensing units blowers and furnaces are good quality but their controls are buggy. AVOID.
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Alexa sketchy
A top shelf thermostat too bad. The Alexa connection is not reliable. Sometimes it will let me set the upstairs sometimes it won’t.
Very slow
It’s crazy in 2026 how long it takes for the app to talk to the home unit (which is continuously connected to WiFi) and then how long any changes you make actually take.
Frequent updates
Why so many?
S30
Temperature set to cool. Doesn't run unless a 2 degree temperature decrease is made. Customer service unable to help!!
Good
Good
New and not working
Kept my old one until they forced me in this new one. It is constantly logging me out, slow to give me access and today does not recognize my email. All issues that the old one did not have. It worked for 2 days in July and it is now back down, a disaster.
Worst app ever
App won’t reconnect, terrible update
GR Home
Excellent Customer Support !
Great product
Functions exceptionally well during change of seasons—seamlessly-/bests all other ‘stats on all counts in Canadian climate.
Legitimately hate this system every single day
Worst thermostat I’ve ever used. The schedules seem to mean nothing. The app is not intuitive and 2 years in, it’s still a daily frustration. So much regret that we didn’t do Nest again.
A
Sadly it almost never works.
