Setback thermostats offer
cost-cutting comfort for you.

For over 100 years, Lennox has been keeping you comfortable in all kinds of weather. And in that time you've come to rely on Lennox products to deliver quality comfort year after year.

When it comes to setting your thermostat, to err is human, but it can be expensive. If, for instance, you forget to adjust the temperature when you leave for work, it can be a costly mistake. Programmable or setback thermostats can make a big difference in energy consumption. The L21™ setback thermostat from Lennox is a state-of-the-art programmable thermostat that delivers maximum comfort, efficiency and energy savings. It's also easy to program.   The L21 offers outstanding round-the-clock energy programming.

EASY TO USE FEATURES

1. Large, easy to read LCD displays continuous correct time and room temperatures.
2. Simple touch of the cover reveals temperature set points while another push shows time set points.
3. A contemporary, modern style blends well with your decor.
4. Status Light shows when system is running. (Heat Pump version shows when supplemental heat is operating.)

5. Clock Buttons allow you to quickly advance or reverse clock time setting.
6. Slides make it simple to precisely set time periods and heating and cooling temperatures.
7. Override Button lets you temporarily change set points, without changing the programming.
8. Permanent Program Memory - Power loss does not affect program.
9. Programming Buttons to easily set, review or change your typical week's schedule.
10. Filter Monitor reminds you when it's time to change or clean your filters.
11. One Day Setback Model - also available with the same features as above except with single setback period.
Fan Switch allows you to select continuous or automatic operation.

ITS AS SIMPLE AS 1, 2, 3!

It's As Easy As...

...a touch of your fingertips. A simple push on the cover reveals the L21's temperature set points, and with another quick touch you can set the time. Different colored lights allow you to know the thermostat's status at a glance. Programming features on the seven day model are easily set to your precise comfort needs.

Simple Installation/Simple Operation

The L21 installs in minutes, without special adjustments. With the L21's straightforward features, you can easily ­ and quickly ­ adjust the functions without needing help from the dealer. Choose from a seven day programmable or single day/night setback model.