Ecobee Aux Heat Automation Trigger

Configuration
12

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EDIT 1

Use this service call in your automation. The template return a boolean true (aux heat on) if the delta is greater than 1 otherwise it returns boolean false (aux heat off).

      - service: climate.set_aux_heat
        data:
          aux_heat: >
            {% set thermostat = 'climate.my_ecobee_3' %}
            {% set current = state_attr(thermostat, 'current_temperature') %}
            {% set target = state_attr(thermostat, 'temperature') %}
            {{ target - current > 1 }}
        target:
          entity_id: climate.my_ecobee_3

EDIT 2

Amendment. Added the balance of the service call, namely the target.

EDIT 3

Correction. Added missing closing parenthesis on lines 2 and 3 of the aux_heat template.