Lennox S40 touchscreen thermostat for intuitive climate control.
Lennox S40 with WiFi enables remote access from anywhere.
Lennox S40 smart zoning and geo-fencing help save energy.

Lennox

Lennox S40 Smart Thermostat (22V24) – Touchscreen, WiFi, Geo-Fencing, Remote Access, High Efficiency

High-performance tools and home improvement made for confident daily results

$477.47

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Why customers choose TaskHolt Tools

Meet the Lennox S40 Smart Thermostat, a touchscreen hub designed to work seamlessly with Lennox communicating products. It automatically configures and controls your heating and cooling to balance comfort, performance, and efficiency.

Built to integrate with a broader system, the S40 reads model and serial numbers from Lennox devices to streamline setup and operation. With optional modules, it can also connect with select conventional HVAC components to extend your total-home comfort and energy awareness.

Smart, proactive control at a glance

  • 7-inch high-definition color touchscreen with a crisp, easy-to-read interface
  • One-Touch Away and Smart Away modes powered by geo-fencing to adjust comfort as you come and go
  • Weather-On-Demand provides live data and a seven-day forecast to help plan daily routines
  • Lennox Smart Technician app supports quick installation, configuration, and remote monitoring

Expand comfort with accessories and zoning

  • Smart Room Sensor and Smart Air Quality Monitor help fine-tune room temperature and air quality
  • Wireless Extender and PureAir S Air Purification System support efficient operation and cleaner air
  • Optional iHarmony Smart Zoning enables up to four zones with centralized control from the S40

Reliable performance and maintenance at your fingertips

  • Supports conventional HVAC with an Equipment Interface Module for broader compatibility
  • Live tests and a Service Dashboard enable quick troubleshooting and ongoing care
  • Weather data, seven-day forecasts, and programmable schedules support flexible routines

Note: The S40 uses a 4-wire standard thermostat wiring. Lennox recommends shielded 18–22 AWG cable to minimize interference. It is designed to work with most 24VAC furnaces, air conditioners, air handlers, and heat pumps up to 3 heat/2 cool, but only with Lennox communicating equipment unless using approved modules. Lennox offers a 10-year warranty on manufacturing defects when installed by a certified HVAC professional; professional installation helps ensure warranty validity.

FAQ

Q: Is the Lennox S40 compatible with non-Lennox HVAC systems?

A: The S40 works with Lennox equipment and some non-communicating systems via an Equipment Interface Module; verify compatibility with your furnace, AC, or heat pump.

Q: Do I need a professional installer for the S40 to maintain warranty?

A: Yes, professional installation is recommended to maintain warranty validity; installer setup screens simplify configuration and diagnostics.

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