Notify HomeMatic if a door is open.

door-open-notify-homematic.yaml

blueprint:
  name: Door Open, Notify HomeMatic CCU
  description: An automation blueprint that reduces the set temperature of your climate
    device or group if a door sensor is open for more than the preset wait time.
    It uses the Homematic window sensor channel to set the temperature to the "Open-window
    temperature" set in the device configuration. You should set the "Mode for temperature
    fall detection" to Inactive to avoid conflicts. It waits until the window is closed
    again in order to restore the climate entity temperature. It has an optional blocking
    entity to prevent the automation running unnecessarily, for example during the
    Summer season.

  domain: automation

  input:
    door_entity:
      name: Door Sensor
      description: The door sensor that will control the climate entity.
      selector:
        entity:
          domain: binary_sensor
          device_class: door

    open_delay:
      name: Door Open Wait Time
      description: Time to delay after door opens before notifying HomeMatic.
      default: 30
      selector:
        number:
          min: 0.0
          max: 600.0
          unit_of_measurement: seconds
          mode: slider
          step: 1.0
  
    blocking_entity:
      name: (OPTIONAL) Blocking Entity
      description: If this entity's state is on, it will prevent the automation from running. E.g. summer mode or away mode.
      default:
      selector:
        entity:
          domain: input_boolean

    climate_entity:
      name: Climate Device
      description: The climate entity that is controlled by the door sensor.
      selector:
        entity:
          domain: climate

  source_url: https://gist.github.com/sotatech/471227449197b5a296394399aee511af
  
variables:
  blocking_entity: !input blocking_entity
  climate_target: !input climate_entity
  climate_id: '{{ state_attr( climate_target, "id") }}'
  open_delay: !input open_delay

trigger:
- platform: state
  entity_id: !input 'door_entity'
  to: 'on'
  for: !input 'open_delay'

condition:
  - condition: template
    value_template: "{{ (blocking_entity == none) or (states[blocking_entity].state == 'off') }}"

action:
- service: homematic.set_device_value
  data:
    address: "{{ climate_id }}"
    channel: 1
    param: 'WINDOW_STATE'
    value: 1

- wait_for_trigger:
  - platform: state
    entity_id: !input 'door_entity'
    to: 'off'
  continue_on_timeout: false

- service: homematic.set_device_value
  data:
    address: "{{ climate_id }}"
    channel: 1
    param: 'WINDOW_STATE'
    value: 0

mode: restart
max_exceeded: silent

Added blocking entity option. I use this with a summer_heating_mode helper to stop the automation running during the summer when it's not needed. Hopefully thus saving on batteries.