Using the Ecobee3 smart thermostat with your iPhone

[iMore.com]

What's better than controlling your Ecobee3 with the touch screen? Controlling it with your iPhone!
One we set up and installed the Ecobee3 smart thermostat, the next step was to set it up on our iPhone. To do that, we downloaded the Ecobee3 app and then registered a new user using the code provided by the thermostat. We set up our account name and password, and then we were good to go.

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