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This app must be used when installing Lennox S40 Thermostat & IAQ accessories.
With the Lennox Smart Tech App, you'll have the latest technology to more quickly and easily install and service a fully communicating home comfort system with the Lennox S40 Smart Thermostat. You can reliably run tests, diagnostics, and change system settings directly from your smartphone without the back and forth from equipment to thermostat.What's New in the Latest Version 4.31.518
Last updated on Nov 24, 2024
For this release Lennox has included Low Global Warming Potential (GWP) refrigerant detection notifications along with general bug fixes.
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Smart Tech App
4.31.518 by Lennox International Inc
Nov 24, 2024