Search  for anything...
Lennox

Lennox S40 (22V24) Smart Thermostat, Touchscreen, WiFi, Communicating System Control, Programmable, High Efficiency, Geo-Fencing, Remote Access, Wi-Fi and Alexa Enabled, Easy Installation

  • Based on 92 reviews
Condition: New
Checking for the best price...
$651.61 Why this price?
Save $218.38 was $869.99

Buy Now, Pay Later

As low as / mo
  • – Up to 36-month term if approved
  • – No impact on credit
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, PayTomorrow, Affirm, Afterpay, Apple Pay, and PayPal. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Free shipping on this product

30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: Only 10 left in stock, order soon!
Fulfilled by Beenimax
Arrives Aug 4 – Aug 9
Order within 3 hours and 35 minutes
Available payment plans shown during checkout

Recently Viewed

Description

Product Overview Lennox S40 Smart Thermostat, Touchscreen, Communicating, WiFi, Programmable, 3 Heat/2 Cool The S40 Smart Thermostat recognizes and connects to all Lennox communicating products to automatically configure and control the heating/cooling system (based on user-specified settings) for the highest level of comfort, performance and efficiency. S40 Smart Thermostat also recognizes model and serial number information for Lennox digitally communicating products to simplify system setup. Learn more about the S40 Smart Thermostat below or visit the S40 resource hub for all your dealer needs. Complement your home comfort system with our suite of technologically advanced accessories to more precisely and efficiently maintain the temperature and air quality in your home: Smart Room Sensor, Smart Air Quality Monitor and Wireless Extender Advanced digital controls in specific heating and cooling units and the PureAir S Air Purification System communicate information about various operating parameters to the thermostat to constantly maintain the most efficient operating conditions possible Additional conventional (non-communicating) indoor air quality comfort products (Healthy Climate Humidifiers, Humiditrol Enhanced Dehumidification Accessory, Healthy Climate HRV/ERV Heat/Energy Recovery Ventilators, Fresh Air Damper, Healthy Climate Germicidal Lights) can be added to the system for a complete total- comfort system Conventional HVAC systems (non-communicating) can be controlled by the S40 Smart Thermostat with the addition of the optional Equipment Interface Module (EIM) Optional Smart Zoning System (iHarmony, for specific HVAC systems) allows whole-home zoning (up to 4 zones) with complete control from the S40 Smart Thermostat and individual In-Zone Thermostats A simple easy-to-use touchscreen allows complete system configuration. Scheduled maintenance alerts, system warnings and troubleshooting are also displayed on thermostat screen Up to four separate schedules are available plus Schedule IQ One-Touch Away Mode - a quick and easy way to set the cooling and heating setpoints while away Smart Away - Schedule IQ uses geo-fencing technology to determine when the homeowner is within a predetermined distance from the home to operate the system when leaving, away and arriving Weather-On-Demand - live up-to-date weather data and seven-day forecasts Easy to read 7 in. high- definition color display (measured diagonally) New Lennox Smart Technician app allows for quick and easy install of S40 Smart Thermostat and the new smart accessories Installer setup screens allow quick and simple system configuration without a manual Installer can also run tests on complete system or individual components for easy maintenance and troubleshooting Service Dashboard features online real-time monitoring of installed smart digitally enabled systems Uses 4-wire standard thermostat wiring. We highly recommend using 18 - 22AWG shielded thermostat cable for communications terminals (I+ and I-) which will help eliminate any noise interference. Note: The Lennox S40 Smart Thermostat with Equipment Interface Module (22X18) will work with most 24VAC furnaces, air conditioners, air handlers and heat pumps (up to 3 stages of heat and 2 stages of cooling), EXCEPT IT WILL NOT WORK with any brand of communicating HVAC equipment other than LENNOX.

Brand: Lennox


Model Name: S40


Special Feature: Programmable


Color: Black


Brand: Lennox


Model Name: S40


Special Feature: Programmable


Color: Black


Temperature Control Type: Automatic


Connectivity Technology: Wi-Fi


Included Components: Smart Room Sensor, Smart Air Quality Monitor, Wireless Extender, Lennox Smart Technician app, Equipment Interface Module (EIM), In-Zone Thermostats


Power Source: Electric Power Source


Voltage: 22 Volts


Shape: Rectangular


Display Type: touchscreen


Finish Type: Glossy


Screen Size: 7 Inches


Control Type: Touch


Control Method: App, Voice


Connectivity Protocol: Wi-Fi


Mounting Type: Wall Mount


Style: Modern


Backlight: Yes


Manufacturer: Lennox


Package Dimensions: 11.5 x 10.16 x 2.91 inches


Item Weight: 1.68 pounds


Item model number: 22V24


Date First Available: June 29, 2023


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Aug 4 – Aug 9

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Works fine with factory rep install, that way we get the warranty, which is 10 years
Review Image by D. E. D. E.
Review Image by D. E. D. E.
We had our air-conditioning company install this, so that we have the warranty, which is 10 years on it through the company. They charged $530 for the install which is outrageous but still much less than if we bought both the thermostat and the install through the company as that would’ve been over $1800 plus installation. We dislike that the two stage system we have is a proprietary system that requires this thermostat in order to operate correctly. We cannot just put in any thermostat. Buyer beware on the two stage systems!!! we do, however, like this thermostat even though it’s pricey! The original model was really poor because you had to have Wi-Fi to get the time in order to use the programming settings. This one the time is built in on the chip and you don’t have to have the Wi-Fi to make the programs work. I’m not really keen on the Wi-Fi but we do have it hooked up and all is working well. We just installed it today because it took a while to get the rep out for that. Additional comment: we are needing to set all our temperatures higher on our AC than our previous thermostat. Seems this senses temperatures differently. FYI ... show more
Reviewed in the United States on June 25, 2025 by D. E. D. E.
    • if you have to replace your Lennox thermostat, this one works
If you are like so many others who invested in a new Lennox HVAC with an iComfort thermostat that stopped responding once the warranty is out, you will need to upgrade to the current version of thermostat. I had purchased a Nest only to find out that Lennox has a proprietary system that only works (well) with their own very expensive proprietary thermostat. I had a service person come out to replace the dead unit only to be told it would be over $2K for him to replace it. However, he was able to tell me which thermostat I needed to buy and gave me basic instructions if I chose to install it myself. Shopping on Amazon, there are several vendors selling this thermostat and I chose this one with a price at almost half of all the rest. I watched a couple of videos on how to install and chose to save money and do it myself. I took pictures of the wiring and followed the instructions. The only hiccups I had were getting the thermostat to connect to the mobile app and wondering what to enter for a dealer code/phone number. There are a lot of features on this thermostat. You can set auto high and low temps depending on the time of day. The mobile app will keep trying to reset the high temp to 78 or 84 and going back and forth to the screen, I was finally able to convince it that I really did want my daytime temp to be 72 and night time temp to be 68. This house is never empty and there is no thermostat on the second floor. It gets very warm working up there. You can set the device to show the actual temp inside and outside as well as the "feels like" temp. You can set the default screen to a photo if you like. Overall, it appears to be working after less than an hour of set up. I would drop stars for the price since this is way over priced compared to other thermostats and I really dislike that Lennox produced such a poor quality thermostat that had to be replaced with their newer version at an exorbitant price. ... show more
Reviewed in the United States on April 3, 2025 by M. Schaefer
    • Worthwhile investment for the IComfort thermostat if you have a variable speed system.
Easy installation. Saved myself a thousand dollars from having the AC company do it. It was literally four wires and two screws. It took me twenty minutes while being extremely careful. It would take the HVAC technicians less then ten minutes. I was quoted over seventeen hundred by the company that installed my system. What they charge should be criminal. ... show more
Reviewed in the United States on May 30, 2025 by Kat
    • Yes, this is the replacement to the older screens and it's easy to install.
Yep, I had the older Lennox touchscreen unit...sorry, I forget the old model number...that experienced the dreaded dead screen. Like many other users, I was dismayed to see the replacement model recommended for professional install, raising the cost beyond kind words. Well, install is pretty easy. With the right instructions, it took me five minutes with a small screwdriver. No biggie. This thermostat works to control my lennox HVAC. The screen has some nasty lag, so it's actually easier to use the app on the phone sometimes. There are some flashy features, like the ability to use your own photos for the background and smooth app integration. I can even set it to give me a monthly summary of system usage, which is not important, but it's kinda fun. It has easy to check weather forecasts built in (as though we walk to the thermostat to check the forecast). It's also got highly programmable settings for single/multi zone and times of day that's all easy to customize. Most importantly, if you're looking for the current replacement to the touchscreen Lennox thermostats from 5-10 years ago, this was the right unit for me. Installing it was easy for me, no technician required, since it uses the same wires as my old thermostat required. Other brand smart-thermostats seem to require other wiring. So, even though the unit is pricey, it was the right way to fix my system myself, and avoid costlier technicians doing what I can with a single screwdriver. In summary, it works, it's easy to install for Lennox HVAC systems, and it has a few features. If you're checking out this model because it's the current replacement for your older Lennox thermostat, yes choose this and install it yourself. ... show more
Reviewed in the United States on August 20, 2024 by M. Acker
    • Easy install if you already have Lenox smart thermosta
Worked as advertised easy to hook up. Now for the fun trying to integrate with home assistant.
Reviewed in the United States on May 21, 2025 by Amazon Customer
    • Too expensive, but the thermostat works fine
Lennox does not care about its customers, only its dealers. You can install this yourself, but I had to use the online service "JUST ANSWER" to get the job done. I have a Lennox AC/ heat system and needed to replace a failed Lennox thermostat. Lennox has made their systems proprietary so in order to use a different brand thermostat you need to do some rewiring of your Lennox system. If your Lennox system has all the bells and whistles you may need a Lennox thermostat to make all that work. I recommend JUST ANSWER if you want to buck Lennox. I will never buy another Lennox system. ... show more
Reviewed in the United States on January 24, 2025 by Canoe2U

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...