Update Nov 2023

As of version 3.1 a Window cover is available directly, the solution below is obsolete.

---

Service call to Vent:

- service: tesla_custom.api
  data:
    command: WINDOW_CONTROL
    parameters:
      path_vars:
        vehicle_id: >-
          {{ state_attr('binary_sensor.<vehicle_name>_online_sensor', 'id') }}
      command: vent
      lat: 0
      long: 0
      wake_if_asleep: true

Service call to Close:

- service: tesla_custom.api
  data:
    command: WINDOW_CONTROL
    parameters:
      path_vars:
        vehicle_id: >-
          {{ state_attr('binary_sensor.<vehicle_name>_online_sensor', 'id') }}
      command: close
      lat: 0
      long: 0
      wake_if_asleep: true

Template Cover (can also be a template switch). This looks at the front driver window to see if it is open or not. Then makes the appropriate api call to open or close.

cover:
  - platform: template
    covers:
      <vehicle_name>_windows:
        device_class: window
        friendly_name: "<Vehicle Name> Windows"
        value_template: >-
          {% if state_attr('sensor.<vehicle_name>_vehicle_state_data_sensor','fd_window') %}
          true
          {%- else -%}
          false
          {%- endif %}
        open_cover:
          - service: tesla_custom.api
            data:
              command: WINDOW_CONTROL
              parameters:
                path_vars:
                  vehicle_id: >-
                    {{ state_attr('binary_sensor.<vehicle_name>_online_sensor', 'id') }}
                command: vent
                lat: 0
                long: 0
                wake_if_asleep: true
        close_cover:
          - service: tesla_custom.api
            data:
              command: WINDOW_CONTROL
              parameters:
                path_vars:
                  vehicle_id: >-
                    {{ state_attr('binary_sensor.<vehicle_name>_online_sensor', 'id') }}
                command: close
                lat: 0
                long: 0
                wake_if_asleep: true