How to Install an ecobee3 Smart Thermostat? Complete Guide

How to Install an ecobee3 Smart Thermostat

Ecobee3 Smart Thermostat is designed to be easy to install, user-friendly, and energy-efficient. It can be control remotely via an app and can be integrate with voice control systems like Amazon Alexa. An ecobee3 Smart Thermostat is a type of thermostat that is control via a smartphone or tablet app. It is designed to be more energy efficient than traditional thermostats.


This smart thermostat provides detailed energy reports so users can track their energy usage. It is also capable of learning the user’s habits and automatically adjusting the temperature for maximum energy savings. The thermostat also has temperature sensors to detect which rooms are occupied and adjust the temperature accordingly.

It is also important for users to know how to install an ecobee3 smart thermostat. Here in this article, we can check the method of installing the smart thermostat yourself, with or without a C wire.


Before You Begin

ecobee3 smart thermostat comes with a box, a Philips screwdriver, a drill with a 3/16-inch drill bit, a hammer, and a pencil. It is also necessary to use the camera phone to take images of current wiring.


Method For How to Install ecobee3 Smart Thermostat

It is also crucial for users to know how to install ecobee3 smart thermostats so they can quickly use them. Let’s check these steps :

The power of your HVAC system must be shut off at the circuit breaker before installing an ecobee3 smart thermostat. Your existing thermostat needs to be remove, and the wires need to be label. Turn the power back on to your HVAC system after screwing the mounting plate to the wall and inserting the wires into the brackets.

  • It is necessary to turn off your HVAC system.
  • Make your way to the circuit breaker and shut off the power to your HVAC system.

Note: Your screen might not turn off when you turn off your HVAC system because most digital thermostats are battery-power. Try increasing or decreasing the temperature on your old thermostat to determine whether you have successfully turned off the HVAC system. Your HVAC system may be turning on even if you have turned the power off. In addition, you can try holding your hand over the vents to see if there is still air coming out.


  • There is a need to remove the cover from your old thermostat, and it is quickly put off. Sometimes it is also necessary to unscrew the covers.
  • After this, there is a need to check your system compatibility with Ecobee3.
  • Ensure that your old thermostat and cover have voltage labels on the inside. Your system is incompatible if they read 110, 120, or 240 volts. Your system will also not be suitable if it has thick wires capped with wire nuts. The system will not be compatible if you see any warning labels or terminals labeled L1 or L2.
  • There is still the possibility that your ecobee3 smart thermostat is incompatible even if you don’t have a high-voltage system. You can check your system’s compatibility using Ecobee’s compatibility checker.
  • There is also a need to label the wire. Your ecobee3 came with labels that you can wrap around each wire corresponding to that label. When plugging a wire into a port labeled “W,” don’t forget to attach the “W” label to it.
  • The wires can be disconnect from the ports they are connect to. Each wire may need to be release from the ports with a screwdriver.
  • It is also essential to make sure that wires do not run back to the wall.
  • Remove the backplate from the wall by unscrewing it. Don’t let the wires retract into the wall as you remove the old mounting plate.
  • You can temporarily place the ecobee3 trim plate over the existing wires. The larger trim plate can be use if you need to cover imperfections on the wall. In any case, you can just skip the large plate if you wish.
  • Next, mark where the mounting holes will be located with a pencil. To ensure the mounting bracket is straight, use the level on the bottom of the mounting plate.
  • It is necessary to drill two holes and remove the trim plates. You can use pencil markings for this.
  • Drill holes in the drywall and then insert drywall anchors into them using a hammer. You will receive these drywall anchors with your ecobee3 kit.
  • Attach the mounting plate to the wall by screwing it in place. To ensure that the mounting bracket is straight, use the level beneath the mounting plate.
  • The wires need to be push into their designated terminals. You can use the labels as a guide. For example, if you only have one “R” wire, insert it into the “Rc” terminal. Once the wire has been inserted correctly, a terminal’s release lever should lower. The wires are also gently tugged to ensure they are inserted correctly.
  • You must properly insert the G wire into the terminal, and the R wire must be insert into the Rc terminal if you are installing the Power Extender Kit.
    When the wires are stuck out from the wall recess, gently push them in. In this way, the ecobee3 smart thermostat can mount onto the plate.
  • Using the mounting plate, snap the thermostat into place. It is possible to push the thermostat flush against the wall. You can’t press on it without it crawling.
  • The power to your HVAC can be turn back on if it has a C-wire.
  • The final step in the installation process is to follow the instructions on your ecobee3 thermostat. Upon turning the power back on, the ecobee3 is turn on, and the display shows “hi”.
  • You will need your WiFi password to complete the process.


After this, you can use your Ecobee3 smart thermostat. It is also critical to read all the instructions properly so you can complete the ecobee3 smart thermostat installation.


Final Words:

There is a need to follow all the steps properly so you can quickly complete the process of how to install an ecobee3 smart thermostat. It is also important to check all the products in the packet so you can use them perfectly.


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