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ecobee3 lite
Live Better. Save More.

Bring home ecobee3 lite and save up to 23%* annually on your heating and cooling costs.

ENERGY STAR® certified, so you know it's good for you and the planet.

Learn more

Smarter Control

Effortless control at your fingertips.

Smarter Savings

Engineered for energy savings. Designed for you.

Sensors sold separately
  • SmartSensor Measure temperature and occupancy in the rooms they’re in to help manage hot or cold spots throughout the home.
  • More Savings Automatically adjusts your ecobee to the right mode for savings when it senses you're not home.
  • More Control Get room-specific temperature and occupancy readings with the ecobee mobile app on your iOS or Android device.
Learn more about sensors
Smarter Home

Supports your connected home to make life simpler.

Built to last

ecobee is hardwired so you'll never be left out in the cold.

Being hardwired means your thermostat isn’t relying on a battery or your HVAC equipment to charge itself (aka “power-stealing”). A little bit extra, for no extra.

product wiring
Easy Setup

Getting started is simple.

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Will it work with my home?

Yes, we are compatible with most residential heating and cooling systems.

Check Compatibility

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Can I install it myself?

You bet. Use our step-by-step guide or call our friendly support team.

Watch Installation Videos

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Can I get it professionally installed?

Yes, we can help connect you with certified pro installers in your area.

Find a Pro


ecobee3 lite understands how your home heats up and cools down, and uses wi-fi to track your local weather throughout the day. It then uses this information to determine the best way to bring your home to your desired indoor temperature when you arrive home and maintain it while minimizing how long your heating or cooling equipment runs for.

ecobee thermostats are compatible with Amazon Echo, Apple Homekit, IFTTT and many more home automation ecosystems. ecobee has a robust API and an active developer community working on new ways to integrate your thermostat into your connected home.

ecobee3 lite is constantly monitoring your equipment performance and will send you an alert if anything is not working or working sub-optimally. Similarly, ecobee3 lite can send you service reminders to help you maintain your equipment.

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Technical Specs



3.5” full-color LCD touch screen

320 x 480 pixel display

Product Dimensions


Length: 4.05 in

Width: 4.05 in

Depth: 0.84 in

Trim Plate

Length: 6.69 in

Width: 6.69 in

Depth: 0.24 in

Power Extender Kit*

Length: 2.44 in

Width: 2.36 in

Depth: 0.84 in

*Optional for installation


Gas, oil, electric, dual fuel

Conventional (2H/2C)

Heat Pump (4H/2C)

Wire Terminals







W1 (AUX 1)

W2 (AUX 2)



Connectivity & Security

Wi-Fi, IEEE 802.11 b/g/n @ 2.4 GHz

Wi-Fi Protected Access (WPA/WPA2) and Wired Equivalent Privacy (WEP)

DHCP (dynamic) or static IP addressing

Transport Layer Security (TLS)

915 MHz


15-20 MB/month

Power Consumption

less than 3.5 VA

Apple HomeKit Enabled

Controlling this HomeKit-enabled accessory requires an iPhone, iPad, or iPod touch with iOS 9 or later.

Powering Methods

Wired 24 VAC through terminals C and Rc or Rh. Power Extender Kit (included) enables you to reliably power your thermostat without having to run a C wire.


Recyclable packaging




ROHS compliant

Temperature Range

Desired Temperature: 44° to 92°F

Display: 41° to 98°F

Sensitivity: +/- 0.9°F

Operating: 32° to 131°F

Humidity Range

Display: 20% to 90% RH

Sensitivity: +/- 5% RH

Operating: 5% to 95% RH (non condensing)


-31° to 113°F

5% to 95% RH (non condensing)


3-year warranty



In the Box

ecobee3 lite thermostat

ecobee3 lite backplate

Installation guide

Wire labels

Drywall plugs


Optional for installation:

Power Extender Kit (PEK)

Large trim plate

in the box
View Full Technical Specs
Factory Re-Certified ecobee3 lite. Good for your home and the planet.
  • Avoid plastic and e-waste and extend the life of a high-quality product.
  • Guaranteed renewed and reliable thanks to being inspected, re-worked, and re-tested by the original manufacturer.
  • A 3-year warranty is standard for all Factory Re‑Certified ecobee3 lite Smart Thermostats.
  • Save money and up your comfort with our award-winning technology—at a fraction of the price.
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