DEALER SUPPORT PAGES

Getting Started

Installing the L40 Smart Thermostat

If you don't already have it, start by downloading the Lennox Smart Tech App to install the thermostat and commission the system.

Step 1 of 2

Need Help with Installation?

Click on the Resources section of this page to access the installation guide and troubleshooting videos.

Step 2 of 2

Have Questions?

View FAQs

Checkout our Software Update History

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Have an iComfort^® S30, E30 or M30?

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Looking for the iComfort^® Wi-Fi thermostat?

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Installer Quick Start Guides