The smarter WiFi thermostat that delivers unparalleled value, control, and comfort.
Lower your energy bills
ecobee3 lite saves an average of 23% on your heating and cooling each year. Check out more details.
Easily adjust temperature and comfort settings from your Android and iOS devices.
Now works with room sensors
ecobee3 lite is now room sensor compatible to measure temperature and occupancy in the rooms they're in to help manage hot and cold spots throughout the home.
Fast, easy installation
Most customers are able to install the ecobee3 lite in 30 minutes or less. Installation is made easy by ecobee's step-by-step installation guide that can be viewed from your phone or other mobile device.
Before you purchase the ecobee3 lite, please make sure that your heating and cooling system(s) are compatible. You can easily check your HVAC compatibility by using our Thermostat Buyer's Guide.
What's a C-wire?
A c-wire (also referred to as a common wire) is a low voltage power wire that many modern thermostats require for their features to work. This ecobee3 lite requires a c-wire or installation of the power extender kit (included) to work.
Many older homes don't have a c-wire because mercury and battery-powered thermostats didn't require one. Therefore, it is important that you make sure that you have a c-wire and that your HVAC system is compatible with ecobee's thermostat. To determine if you have a c-wire, please remove your old thermostat's cover plate. You should see several wire terminals labeled with letters. If a wire is connected to the C terminal, you have a c-wire.
If you do not have a c-wire on your existing thermostat, you maybe able to substitute an extra wire or the G wire for the c-wire. You can also hire an HVAC contractor to help you install the c-wire and the thermostat.
If you still have any questions regarding the ecobee3 lite, please contact our customer support team.