Unlock the full potential of Lennox® heating and cooling systems while optimizing comfort and energy savings with the all-new Lennox S40 Smart Thermostat.

Lennox is proud to announce the latest additions to our industry-leading suite of smart products with the launch of the Lennox S40 Smart Thermostat and accessories. The suite of technologically advanced smart accessories launching alongside the S40 Smart Thermostat – the Lennox Smart Air Quality Monitor and the Lennox Smart Room Sensor – expand the sensing and automation abilities, and the interconnectivity of the technology for an unparalleled home comfort experience.

Unlike most smart thermostats, the Lennox S40 Smart Thermostat is more than a temperature regulator. It’s the command center for your entire system, with the incredible ability to monitor sensors throughout your home and in all your equipment. From detecting air pollutants and customizing comfort by room to providing maintenance and service reminders, it will even automatically alert you if your system goes out of tune and allow you to remotely share diagnostics.

Indoor air quality continues to be an increasingly important consideration for homeowners. To combat poor-quality air from outdoor air pollution and other allergens, the S40 command center, when paired with the Smart Air Quality Monitor, has the exclusive ability to detect air pollutants and trigger air cleaning on demand to ensure the healthiest air possible. The Lennox S40 Smart Thermostat and accessories go beyond “smart” to ensure the most perfect air and peace of mind by detecting air pollutants, customizing comfort by room, providing maintenance reminders and service alerts, and more.

The Smart Air Quality Monitor detects and tracks particulates, carbon dioxide and volatile organic compounds (TVOC’s) inside the home. When poor-quality air is detected, it triggers the system to cycle and clean the air to ensure the healthiest air possible. The monitor is the only one on the market that enables on-demand ventilation, purification and filtration based on real-time air quality readings.  

Lennox Smart Room Sensor 

The Smart Room Sensor provides accurate temperature and humidity readings to the S40 Smart Thermostat and tells it how to balance temperatures across the rooms where the sensor is placed. When a room is in use, occupancy sensors keep the set temperature. When it’s not, the sensors revert to a more energy-efficient temperature.

Schedule IQ Technology, Smart Away™ geo-fencing capabilities and one-touch Away Mode ensure the Lennox S40 Smart Thermostat and connected equipment run as efficiently as possible by maintaining comfort when the home is occupied and saving energy when it is not.

The Lennox S40 Smart Thermostat is part of the Ultimate Comfort System™ HVAC system which combines the best of the Dave Lennox Signature® Collection to create an unprecedented whole-home comfort system. From heating and cooling to air purification and effortless controls, every component of the Ultimate Comfort System HVAC system works seamlessly together to deliver nothing short of perfect air.