Binary sensor based om attributes from climate entity

configuration.yaml

binary_sensor:
  - platform: template
    sensors:
      heating_status:
        friendly_name: "Heating Status YOUR CLIMATE ENTITY"
        value_template: >
          {% if state_attr('climate.YOUR_CLIMATE_ENTITY_HERE','hvac_action') == 'heating' %}
            on
          {% else %}
            off
          {% endif %}
        device_class: heat