Lennox L40 Smart Thermostat

Universally compatible, Wi-Fi thermostat for single-stage equipment

The Lennox L40 Smart Thermostat is a universally compatible, Wi-Fi thermostat for single-stage equipment that is ENERGY STAR® Certified. The L40 provides complete control at home or away and includes features such as automatic changeover, Smart Away® Mode, Advanced Diagnostics and much more. The L40's four-color, touchscreen display is easy to use, with large, legible fonts and organized screens that make setting your thermostat a breeze. With a slim profile and glass-like finish, it is more attractive on your wall than traditional thermostats

Step-by-step onboarding process streamlines thermostat setup and allows you to easily customize the features of your Lennox L40 Smart Thermostat. And the L40 effortlessly integrates with a range of smart home devices—from premium smart home systems like Control4 to popular virtual assistants like Amazon Alexa, GoogleAssistant and Building36. Advanced diagnostics keep your system at peak performance - Protecting your investment and keeping your system at peak performance with advanced diagnostics that can be remotely shared with your local Lennox dealer to troubleshoot issues and avoid unnecessary service visits.

View overall system performance details and more when you opt in for monthly performance report emails.

Getting Started

WELCOME TO YOUR LENNOX L40 SMART THERMOSTAT

For easy setup, creating your new Lennox account and getting the best user experience with your L40 please refer to the Lennox L40 Homeowner Setup Video or the L40 User Guide.

Download the Lennox Home App for complete control at home or away.

L40 User Guide

SPECIFICATIONS

ENERGY STAR^®Certified
Heating, ventilation and air -conditioning (HVAC) equipment with the ENERGY STAR label meets or exceeds federal guidelines for energy -efficient performance.
Schedule IQ Technology
Uses homeowner inputs and Smart Away® geo -fencing capabilities to learn your routine and create a schedule that maintains comfort when the home is occupied and help save energy when it's not.
Advanced diagnostics keep your system at peak performance
Protect your investment and keep your system at peak performance with advanced diagnostics that can be remotely shared with your local Lennox dealer to troubleshoot issues and avoid unnecessary service visits
Access your Lennox L40 Smart Thermostat from your choice of smart home device
The Lennox L40 Smart Thermostat effortlessly integrates with a range of smart home devices —from premium smart home systems like Control4 to popular virtual assistants like Amazon Alexa, Google Assistant and Building36.

Performance reports help you fine -tune settings for efficiency
View overall system performance details and more when you opt in for monthly performance report emails.
Setup and customization made simple.
The Lennox L40 Smart Thermostat is programmed to intuitively guide you through the process of connecting to Wi -Fi, creating your account and pairing it with your thermostat. Additionally, the customization badge on the home screen simplifies the onboarding process by familiarizing you with the main features of the thermostat and helping you customize settings such as schedules, alerts and One - touch Away Mode so you can get the most from your L40.
Modern design, simple navigation
The Lennox L40 Smart Thermostat's four -color, touchscreen display is easy to use, with large, legible fonts and organized screens that make setting your thermostat a breeze. With a slim profile and glass - like finish, it is more attractive on your wall than traditional thermostats.