Lennox S40 Smart Thermostat
The Lennox S40 Smart Thermostat is Matter certified (certificate CSA25B3DMAT47759-24, certified Oct 14, 2025). It uses Wi-Fi, so it needs no Thread border router, only your platform’s Matter controller. A certified Matter device can be added to any Matter controller whose app supports its device type, such as Apple Home, Google Home, Alexa, SmartThings or Home Assistant; features vary by app. The maker hasn’t named platforms on a page we hold. Sold in the US at Amazon.
Certificate data: CSA ledger read . Set-up steps and sources: Apple Home · Google Home · Alexa · SmartThings · Home Assistant
CSA Matter certified (certificate CSA25B3DMAT47759-24). Uses Wi-Fi, so it needs no Thread border router, only your platform’s Matter controller.
At a glance: Matter certified: Yes, Oct 14, 2025 · Connectivity: Wi-Fi · Thread border router: Not needed (uses Wi-Fi)
- Works with
- Matter certified as a thermostat, so it can work with Matter apps such as Apple Home, Google Home, Alexa and SmartThings when the app supports its device type; supported features vary by app. The maker hasn’t named platforms on a page we hold.
- CSA certificate
- CSA25B3DMAT47759-24, certified Oct 14, 2025
- Network & hub
- Wi-Fi; needs no Thread border router, only your platform’s Matter controller
Updated : the last change to this page’s certification, platform or store facts.
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Amazon
Where to buy
1 store
Check the model, region and pack size at the retailer. Prices and availability are confirmed there.
CSA Matter Certified
Certificate: CSA25B3DMAT47759-24Matter 1.3 certificate
Its certificate, CSA25B3DMAT47759-24, is for Matter 1.3, certified Oct 14, 2025. The Matter version is the specification version on the certificate's ledger record.
Source: CSA Distributed Compliance Ledger, read Nov 10, 2026.
What Matter 1.3 added, and which devices use it →Certified software versions
The CSA ledger lists 2 certified software versions for the device on certificate CSA25B3DMAT47759-24. The most recent is software 04.38.0087, certified Oct 14, 2025, for Matter 1.3. That is the certificate this page shows.
- Software 04.38.0087 · certified Oct 14, 2025 · Matter 1.3 · CSA25B3DMAT47759-24 · this page's certificate
- Software 04.38.0081 · certified Sep 24, 2025 · Matter 1.3 · CSA2592BMAT47229-24
Certification covers each software version listed. It does not establish the software on a unit you buy.
Source: CSA Distributed Compliance Ledger, device record (vendor ID 4950, product ID 1), read Nov 10, 2026.
The Lennox S40 Smart Thermostat is a Wi-Fi thermostat with a 7-inch color touchscreen, made for Lennox communicating HVAC systems and compatible Lennox furnaces, air conditioners and heat pumps. Lennox says it manages temperature, humidity and air quality, with Schedule IQ adaptive scheduling and Smart Away geofencing. Remote access runs through the Lennox app, and built-in diagnostics send alerts about system problems.
Sources: the CSA product listing, read Oct 31, 2026; the CSA product listing, read Oct 31, 2026.
Specifications
- Brand
- Lennox
- Category
- Thermostats
- Protocols
- Wi-Fi
- Certificate ID
- CSA25B3DMAT47759-24
- Certificate holder
- Lennox International, Inc.
- Certified
- Oct 14, 2025
- Firmware
- 04.38.0087
Ecosystem compatibility
Quick answers
- Is the Lennox S40 Smart Thermostat Matter certified?
- Yes. MatterCatalog matches it to CSA Matter certificate CSA25B3DMAT47759-24, certified Oct 14, 2025.
- Does the S40 Thermostat work with Apple Home or HomeKit?
- Likely. It is Matter certified (certificate CSA25B3DMAT47759-24), so any Matter controller whose app supports its device type can add it. The maker hasn’t named Apple Home on a page we hold. Apple says an iPhone using iOS 18 or later can add Matter accessories to the Home app without a home hub. Apple’s Matter page lists thermostats among the accessory types the Home app supports.
- Does the S40 Thermostat work with Google Home?
- Likely. It is Matter certified (certificate CSA25B3DMAT47759-24), so any Matter controller whose app supports its device type can add it. The maker hasn’t named Google Home on a page we hold. Google says you need a Matter-enabled hub device set up on your home wireless network before you can add Matter devices to Google Home. Google’s supported-device-types page lists the Thermostat type.
- Does the S40 Thermostat work with Alexa?
- Likely. It is Matter certified (certificate CSA25B3DMAT47759-24), so any Matter controller whose app supports its device type can add it. The maker hasn’t named Alexa on a page we hold. Alexa needs a Matter-compatible Echo; Amazon says its Echo devices support “a subset of Matter 1.5 and lower device types”, so check that yours does.
- Does the S40 Thermostat work with Samsung SmartThings?
- Likely. It is Matter certified (certificate CSA25B3DMAT47759-24), so any Matter controller whose app supports its device type can add it. The maker hasn’t named SmartThings on a page we hold. SmartThings adds Matter devices through the SmartThings app and a Matter controller.
- Does the S40 Thermostat work with Home Assistant?
- Likely. It is Matter certified (certificate CSA25B3DMAT47759-24), so any Matter controller whose app supports its device type can add it. The maker hasn’t named Home Assistant on a page we hold. Home Assistant says: “Adding a new Matter device only works in the Home Assistant Companion app.”
- Does the Lennox S40 Smart Thermostat use Thread or Wi-Fi?
- Wi-Fi. Its catalog record lists Wi-Fi, so it joins your Wi-Fi network and does not need a Thread border router. You still need your platform’s Matter controller.
- Does the S40 Thermostat need a hub or a Thread border router?
- No hub of its own and no Thread border router: it joins your Wi-Fi network. You still need your platform’s Matter controller (a smart speaker, display, streaming box or hub), though Apple says an iPhone using iOS 18 or later can add Matter accessories without a home hub.
- When was the S40 Thermostat Matter certified?
- The CSA certified it on Oct 14, 2025 (certificate CSA25B3DMAT47759-24). That is its certification date, not a retail release date, which MatterCatalog does not state.
- Where can I buy the Lennox S40 Smart Thermostat?
- MatterCatalog has verified store links for it at Amazon. Check the current price, model and pack size at the store.
From this product’s catalog record, not hands-on testing. Editorial policy
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Lennox S40
CSA certified