First download the Ecobee app to your Android or iOS device and create an account. If you're already signed in, enter your existing credentials to get to the main Ecobee app screen.
The app asks immediately if Ecobee should display your "home data". (Note: This only happens when you sign in from an iOS device.) If you say "OK," grant Apple HomeKit the permission to connect to Ecobee. This is the first step in using Siri to control your smart thermostat – and the Home app to manage the interaction with your thermostat in HomeKit.
The app prompts you to enter your address (if you have not already) to let the thermostat display local weather forecasts, the time of your home, and much more.
Now you have arrived on the app home screen. Select either "Add Device" in the middle of the screen or press the plus sign in the upper right corner of the screen.
After selecting the desired device, the app guides you through the entire installation process. Always contact an electrician if you have questions or concerns about whether your HVAC system is compatible with a new thermostat – or how to install it.
In general, the following steps are required to install an Ecobee Smart Thermostat:
. Fortunately, Ecobee includes a Power Extender Kit (PEK) as a workaround, so you do not have to install another cable. I did not have to use the PEK because I have a C-cable.
The PEK is a more elaborate installation that takes a bit longer. Find out more about the PEK and its installation on this Ecobee support page.
Installing the Ecobee Smart Thermostat, including drilling new holes, took about 10 minutes. The last few configuration steps – registering your thermostat, adding details to your home, answering questions about your HVAC system, setting up Alexa, Google Assistant and Siri Voice Control, and pairing the included temperature sensor – took another 10 to 15 minutes.