Lennox S40 Smart Thermostat

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. The S40 Smart Thermostat also recognizes model and serial number information for Lennox digitally communicating products, simplifying system setup.

• 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

Product Measurements: 4.438 Inch Height x 7.063 Inch Width x 0.75 Inch Depth

This thermostat is commonly used in the following Models:

• HCSTEAM-35
• ICOMFORT S30
• ICOMFORT WI-FI - 10F81
• ICOMFORT WI-FI - 88W58
• S40

This thermostat replaces the following models: 19V30, 12U67, 10F81, 88W58, 49W95, 106524-01, 104550-01, 103445-01

Popular add-on products commonly purchased with this device:

Lennox 22V25 Smart Room Sensor

Lennox 21P02 Smart Air Quality Monitor

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®. 

Click to view spec sheet

10-year warranty valid on S40 Smart Thermostat in residential applications.

During the checkout process, you can choose from expedited services such as overnight delivery to standard ground shipping. We aim to ensure your order is delivered promptly and reliably, wherever you are.

All returns must be made within 30 days of purchase with the invoice. (After 30 days, Interlight credit only, Minimum 25% restocking fee, no returns after 60 days, special items order just for you are not returnable.)

At Interlight, your satisfaction is our priority. We offer a 30-day money-back guarantee on eligible products, provided they are returned in resalable condition with the original invoice.