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Lennox L40 Smart Thermostat

By Lennox International, Inc.

The Lennox L40 is a sleek, ENERGY STAR® certified smart thermostat designed for universal compatibility with single-stage heating and cooling systems, including dual-fuel setups. Featuring a vibrant touchscreen display and intuitive navigation, it offers advanced comfort control with Schedule IQ™ technology and Smart Away® geo-fencing to optimize energy use. Enjoy remote access via the Lennox Home app or voice control through Amazon Alexa, Google Assistant, and Control4®. The L40 provides real-time energy reports, customizable maintenance reminders, and auto-changeover between heating and cooling. With smooth setback recovery, short-cycle protection, and a 5-year limited warranty, the L40 combines modern design with intelligent performance for effortless home comfort management.

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Product Details

  • Firmware Version 04.38.0087
  • Hardware Version 0004
  • Certificate ID CSA25B3CMAT47758-24
  • Certified Date 10/14/2025
  • Product ID 0x0002
  • Vendor ID 0x1356
  • Compliance Document Download Compliance Document
  • TIS/TRP Tested Yes
  • Specification Version 1.3
  • Transport Interface Wi-Fi
  • Primary Device Type ID 0x0301

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