Main Menu

Product Help

Smart Thermostats

Smart Thermostats

Smart Thermostats

Lennox Wireless Extender

Lennox S40 Smart Thermostat

Lennox Smart Room Sensor

Lennox L40 Smart Thermostat

View All

Indoor Air Quality

Indoor Air Quality

Indoor Air Quality

Lennox Smart Air Quality Monitor

View All

Smart Homes and Integrations

Smart Homes and Integrations

Smart Homes and Integrations

Lennox + Control4

Lennox + Google Assistant

Lennox + Amazon Alexa

View All

Water Heaters

Water Heaters

Water Heaters

Heat Pump

View All

Apps and Accounts

Apps and Accounts

Apps and Accounts

Lennox Home App

View All

View All
FEATURED

S40 Smart Thermostat
Our latest, most advance thermostat gives you the ultimate control over your Lennox system.

Learn More
FAQs
Main Menu

Warranty Tools

Product Registration

Warranty Lookup
FEATURED

Warranty Your Way
Lennox stands behind our products with coverage designed to protect your investment and ensure peace of mind.

Learn More
News & Updates
Main Menu

Have a Question?

Our customer support team is just a message away, ready to help with any queries you have.

Chat Contact Us

What features or advantages does the S40 Smart Thermostat offer?

FAQ , Thermostats , Maintenance Modified: March 19, 2026

The Lennox S40 Smart Thermostat is the ultimate controller for precise comfort. Please click here to explore features of the product.

Have a Question?

Our customer support team is just a message away, ready to help with any queries you have.

Chat Contact Us

Find a Local Pro

Enter your zip code to find a Lennox® dealer near you for service, support, or installation.