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ENERGY STAR Certified
Smart Thermostats

Smart thermostats that earn the ENERGY STAR label have been independently certified to deliver energy savings.

For the average American household, almost half of the annual energy bill goes to heating and cooling – that’s more than $900 a year. Being smart about how you control your temperature settings with an ENERGY STAR certified smart thermostat will help you save money and stay comfortable in your home.

Each product uses slightly different features to help homeowners save energy, so do your research, and choose the ENERGY STAR certified smart thermostat that's right for you.

Common ENERGY STAR certified smart thermostat features may include:

  • Remote Control:
    • Using your smartphone, you can adjust the temperature in your home from anywhere with an internet connection.
  • Geofencing:
    • This feature allows your thermostat to detect when you’ve left for the day to ‘set back’ your HVAC system and save money on your heating or A/C bill. If you’re on the way home, the thermostat can automatically adjust the temperature to ensure you arrive to a comfortable home.
  • Learning temperature preferences:
    • Certain ENERGY STAR certified smart thermostats can learn your preferences automatically and establish a schedule that adjusts to energy-saving temperatures when you are asleep or away.
  • Over-the-Air Updates:
    • Your thermostat may update its software periodically to ensure it uses the latest algorithms and energy-saving features available.

Buying tips:

  • Make sure the smart thermostat you purchase is compatible with your heating and cooling system. For the very highest efficiency heating and cooling equipment, you may want a controller from the same company. (E.g. Air conditioner rated at 20 SEER or higher).
  • If your smart thermostat uses WIFI, make sure it’s reasonably close to the router to prevent periodic disconnections. If your thermostat is too far from your router, consider a WIFI range extender, which can improve overall connectivity.

ENERGY STAR certified smart thermostats are also designed to be compatible with the programs that some local utilities offer, providing home owners in their service territory with incentives to help them manage reliability.


Lennox - L40 Smart Thermostat

Model

  • Thermostat Brand Owner Field details:
    Lennox Industries
  • Thermostat Brand Name Field details:
    Lennox
  • Thermostat Model Name Field details:
    L40 Smart Thermostat
  • Thermostat Model Number Field details:
    L40

Description

  • ENERGY STAR Partner Field details:
    Lennox Industries
  • Demand Response Summary Field details:
    Lennox L40 thermostats supports Automatic demand response capabilities, participating as an OpenADR 2.0b compliant virtual end node (VEN) in the DR process. L40 also complies with requirements specified in California Building Energy Efficiency Standards (Title 24, Part 6 Joint Appendix 5). Using Lennox phone app users can enroll their Lennox L40 in ADR services with their Energy Provider. Enrolled users can activate/deactivate their participation in ADR at any time. When user opts to participate in ADR, L40 establishes a secure connection to Energy providers DR server and periodically retrieves/responds to demand response signals. L40 automatically adjusts desired control targets (SP) to configurable presets corresponding to demand response signals. Users can configure limits to these adjustments, based on personal comfort or savings preference.

Efficiency

  • Standby Power (W) Field details:
    0.71

Features

  • Thermostat Heating and Cooling Control Features Field details:
    Other
  • Other Heating and Cooling Control Features Field details:
    Only Internal Temperature Sensors,supports single stage equipment
  • Thermostat Communication Method Field details:
    Bluetooth,Wi-Fi
  • ENERGY STAR Certified Field details:
    Yes

Market

  • Date Available on Market Field details:
    04/01/2025
  • Date Certified Field details:
    09/30/2024
  • Markets Field details:
    United States, Canada

Additional Model Identification

ENERGY STAR Unique IDField details: 3629789