New Lennox L40 Dual Fuel 1 Stage Heat 1 Stage Cool Touchscreen Smart Programmable WiFi Thermostat with Auxiliary/Emergency Heat Options

Price: $249.00
(as of Feb 19, 2026 09:14:38 UTC – Details)


The Lennox L40 Smart Thermostat combines sleek, modern design with advanced technology to deliver unparalleled comfort and energy efficiency. Featuring a vibrant color touchscreen display with easy-to-read fonts and intuitive navigation, setting up and managing your thermostat is effortless. The slim profile and glass-like finish make it an elegant addition to any home, blending seamlessly with your decor. Energy Star certified, the Lennox L40 meets or exceeds federal guidelines for energy efficiency, helping homeowners reduce utility costs while qualifying for local energy rebates. With remote control capabilities through the Lennox Home App, you can easily manage your thermostat from anywhere using your smartphone. The smart programmable features allow you to set filter reminders and create a custom schedule to match your lifestyle, while the Automatic Changeover feature seamlessly switches between heating and cooling systems to maintain comfort throughout the year. Equipped with innovative Smart Away geo-fencing capabilities, the L40 learns your routines to optimize energy use, keeping your home comfortable when occupied and conserving energy when it’s empty. Schedule IQ Technology allows you to program your thermostat once and automatically adjusts to changing routines, offering up to four separate 7-day schedules plus Schedule IQ for ultimate flexibility. One-Touch Away Mode overrides regular programming to instantly adjust heating and cooling set points, maximizing energy savings. The New Lennox Smart Technician app enables quick and easy installation using Equipment Custom Configuration Profiles on the Service Dashboard. Monthly Performance Report Emails keep homeowners informed about system performance, while emailed alerts and reminders notify both homeowners and dealers of maintenance or service needs. The Service Dashboard features online real-time diagnostics, allowing technicians to run tests on the complete system or individual components for efficient troubleshooting and maintenance. With Heat Pump Balance Point control, the thermostat automatically optimizes energy efficiency using outdoor temperature data from online weather services. Temporary and advanced diagnostics provide instant insights to resolve issues quickly, reducing unnecessary service visits. The Lennox L40 effortlessly integrates with popular smart home devices, including Amazon Alexa, Google Assistant, Control4, and Building36, making it the perfect addition to any connected home. Upgrade your home’s comfort and efficiency with the New Lennox L40 Smart Thermostat—designed for smarter living, seamless control, and optimal energy savings
Smart Wi-Fi thermostat with touchscreen control, featuring a fully programmable 7-day universal thermostat for effortless temperature management.
ENERGY STAR certified for energy-efficient performance, helping reduce energy costs and qualify for local rebates
Seamlessly integrates with Amazon Alexa, Google Assistant, Control4, and Building36 for hands-free control and enhanced home automation.
Smooth Setback Recovery automatically adjusts heating and cooling systems to reach the desired temperature at the start of each program period.
Advanced scheduling options with up to four separate schedules using Schedule IQ Technology, plus One-Touch Away Mode for quick energy-saving settings.
Real-time clock automatically updates for daylight savings and retains settings during power outages with permanent memory storage.
Compressor short-cycle protection prevents system damage with a 5-minute delay between cycles, ensuring reliable long-term performance.
Maintenance reminders and alerts notify users when to service or replace filters, humidifier pads, UV lamps, and ventilation filters to prolong equipment life.
Universal compatibility for gas, electric, and heat pump systems, including dual-fuel operation for versatile HVAC control.
Backed by a 5-year limited warranty for residential applications, providing reliable performance and peace of mind.