Lennox Industries
Lennox S40 640772c8cf7cb

Lennox S40 Smart Thermostat Promises 'Perfect Air, Peace of Mind' for Homeowners

March 7, 2023
Lennox reports the S40, which optimizes homeowner comfort and energy savings, is now available.


RICHARDSON, Texas, Jan. 2023-- Lennox Industries in January announced the latest additions to its industry-leading suite of smart products with the launch of the Lennox S40 Smart Thermostat and accessories, including the Lennox Smart Air Quality Monitor and the Lennox Smart Room Sensor.

According to Lennox, 82 percent of homeowners have said they are making good air quality a priority now, compared to one year ago, according to a survey commissioned by 4Media Group on behalf of Lennox Industries in November 2022.

To achieve the most perfect air, the Lennox S40 Smart Thermostat detects air pollutants, and customizes comfort room-by-room, in addition to providing maintenance reminders and service alerts.

"At Lennox, we believe the air in your home should be personalized to your degree of perfection," said Quan Nguyen, Vice President and General Manager at Lennox Industries. "The Lennox S40 Smart Thermostat controls a one-of-a-kind, fully communicating system that seamlessly and intelligently works together to stay tuned into your home and deliver consistently perfect, healthy air." 

According to the "State of the Air" 2022 report from the American Lung Association, despite decades of progress on cleaning up sources of air pollution, more than 40% of Americans—over 137 million people—are living in places with failing grades for unhealthy levels of particle pollution or ozone. Combined with the almost two-thirds of homeowners that have pets and over one-third with household members with allergies, the demand for clean indoor air is more important than ever.1 To combat poor quality air resulting from outdoor air pollution and other allergens, the Lennox Dave Lennox Signature Collection digital HVAC system, when paired with the S40 thermostat and 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 is more than a temperature regulator; it is the command center for your entire Lennox system," said Ingrid Berkley, senior product marketing manager of controls and indoor air quality at Lennox Industries. "The S40 Smart Thermostat monitors sensors throughout your home while ensuring a seamless user experience, bolstered by a variety of automation features," Berkley said.

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.

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 circulate 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. 

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. Of the 37% of homeowners who work from home more often now than they did pre-pandemic, comfortable room temperature and clean indoor air are cited as the top factors that create an optimal work-from-home environment.1 

According to Lennox, the S40 Smart Thermostat and its associated smart accessories make achieving perfect indoor air a reality with features such as Feels Like™, automatic changeover between heating and cooling operation, and Precise Comfort® Plus, which create the temperature you want to feel, not just the temperature set. 

Schedule IQ™ Technology, Smart Away™ geo-fencing capabilities and one-touch Away Mode ensure the 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. For homeowners who have made the switch to a smart thermostat setup or are interested in doing so, saving money on utility bills is recognized as a top motivator by approximately 90%.1

Remote control of the home environment is one touch or voice command away with the S40 Smart Thermostat. Homeowners can monitor temperatures and schedules from anywhere in the world with the Lennox Smart Thermostat mobile app, available on the App Store and Google Play. With voice control technology cited as the top smart thermostat feature desired by homeowners, the S40 Smart Thermostat effortlessly integrates with a range of smart home devices – from premium smart home systems like Control4™ home automation to popular virtual assistants like Amazon Alexa and Google Assistant.1

The S40 Smart Thermostat is part of the Ultimate Comfort System™ HVAC system which combines the best of the Dave Lennox Signature® Collection products to create an unprecedented whole-home HVAC 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.


  1. American Home Comfort Study commissioned by Decision Analyst.