Upon powering up the ecobee3 it will provide step by step prompts to assist with the HVAC equipment configuration. The ecobee3 will first start with the temperature sensor calibration, this can take up to 20mins before you can resume with the thermostat configuration. Here is an example of this process:
(continued): Product Installation – Set Preferences 1st run process
These steps allow the user to select the thermostat name, set your desired heat/cool set-point, HVAC system mode and enable-disable Smart Home/Away after completing the initial setup. This way the ecobee3 can start to regulate the temperature even before the user customizes their 7-day comfort program.