Apps in this category may contain mild or occasional cartoon, fantasy or real-life violence, as well as occasional or mild adult, sexually suggestive or horrifying content and may not be suitable for children under 9 years of age.

12+

Apps in this category may contain occasional mild indecent language, frequent or intense cartoon or real-life violence, minor or occasional adult or sexually suggestive material, and simulated gambling, and may be for children under 12 years of age.

17+

You must be at least 17 years old to access this App.

Apps in this category may contain frequent and intense offensive language; Frequent and intense cartoon, fantasy or realistic violence: frequent and intense adult, scary and sexually suggestive subjects: as well as sexual content, nudity, tobacco, alcohol and drugs, may not be suitable for children under 17 years of age.

(S40) Smart T-Stat Screenshots

iPad

iPhone

About (S40) Smart T-Stat

The Lennox Smart Thermostat App allows you to remotely access and control your Lennox S40 Smart Thermostat and advanced accessories from anywhere in the world. Whether it’s adjusting your home’s temperature or schedule, monitoring your indoor air quality or balancing room temperatures, the control is all at your fingertips.
You must own a Lennox Smart Thermostat (S40) to use this app. The Lennox Smart Thermostat must also be connected to your home’s Wi-Fi router before the app can control the settings. For more information go to https://www.lennox.com/products/comfort-controls/thermostats

We truly appreciate your questions and comments. Please keep sending your suggestions to consumeraffairssocial@lennoxind.com or @AskDaveLennox on Twitter.

What's New in the Latest Version 4.27.129

Last updated on Feb 5, 2024

Old Versions

At Lennox, we are continuously improving our products to better support your needs. For this release, we upgraded the security for Face ID and Touch ID and improved the Smart Away feature while fixing some minor bugs.

Version History

4.27.129

Feb 5, 2024

4.26

Sep 15, 2023

* Supports iOS 17 Release
* Bug Fixes

4.25

Aug 29, 2023

- Temporary Advanced Diagnostics allows you to grant access to your Lennox Dealer for 24 Hours so they can remotely conduct diagnostic tests and arrive at your house with the correct parts to service your unit.
- Bug Fixes

4.20.246

Jun 3, 2023

* Step-by-step onboarding process streamlines thermostat setup and allows you to easily customize the features of your Lennox S40 Smart Thermostat
* Sleep Mode allows the Smart Room Sensors placed in your bedroom to override the presets on your Lennox S40 Smart Thermostat during a scheduled time window, ensuring you get the perfect nighttime air you need for a comfortable sleep.
* Bug Fixes

We are actively working on fixing bugs and performance issues. Be sure to enable automatic updates for your app settings so you don’t miss anything.

4.15.217

Apr 7, 2023

* Support for Apple iPads
* Bug Fixes

We are actively working on fixing bugs and performance issues. Be sure to enable automatic updates for your app settings so you don’t miss anything.

4.10.187

Dec 19, 2022

This release includes bug fixes and improvements.

4.0

Nov 3, 2022

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