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Lennox Smart Room Sensor

Room temperature balancing sensor for Lennox S40 Smart Thermostat

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Price Guide

Warranty

10-Year Limited Warranty on covered components

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Features

Perfectly balanced temperatures across rooms

The Lennox Smart Room Sensor helps you dial in a more perfect environment by providing accurate temperature and humidity readings to the S40 Smart Thermostat and telling it how to balance temperatures across the rooms where the sensor is placed.

Perfectly balanced comfort and efficiency

The Lennox Smart Room Sensor isn’t just about perfectly balanced comfort; it can also help you save energy. When a room is in use, occupancy sensors keep your set temperature. When it’s not, the sensors revert to a more energy efficient temperature.

Smart for precision and efficiency

Designed to pair with the Lennox S40 Smart Thermostat as part of a fully communicating home comfort system.

Greater control is at your fingertips

When connected to the Lennox S40 Smart Thermostat, homeowners can monitor, control, and balance room temperatures from anywhere using the app.

Versatile. Wireless. Smart.

The Lennox Smart Room Sensor is discrete, completely wireless, and thanks to its versatility and portability, installs in minutes.

Greater range. Greater performance.

The Lennox Wireless Extender improves the connection between the S40 Smart Thermostat and technologically advanced accessories, such as the Smart Room Sensor and the Smart Air Quality Monitor, in larger homes or areas with reduced coverage or “dead spots.” This strengthened connection nearly doubles the coverage area and thus enhances reliability, performance, and usability.

Ratings & Reviews

See what other customers are saying about
Lennox Smart Room Sensor

5/5

Great product spot on

June 20, 2026

I live in an older home with undersized ductwork going upstairs. I specifically bought this because my ductwork is small, and until I have the funds to fully update the system, using a thermostat with remote sensors helps a bit. If you already have a true multi-zone system, this setup will work perfectly for you. For the rest of us, it essentially just averages the temperature across the house. For example, if it's 75°F upstairs in my room and 68°F in the living room, the average is around 72°F. If you set the thermostat to 68°F, the system will keep running until that warmer upstairs room eventually comes down closer to a comfortable temperature. However, these sensors are meant for multi-zone management—they are not a magic fix for bad airflow. People need to do their homework before buying things they don't need. Reading some of these reviews, it’s obvious the customers didn't research the product at all. I actually consulted with Albright's Mechanical, and they were incredibly knowledgeable on everything Lennox has to offer.