https://community.home-assistant.io/t/smart-thermostat-2-0-blueprint/478348

smart-thermostat.yaml

blueprint:
  name: Smart Thermostat off/heat (LUMI/Aqara)
  description: 'Forked from: https://community.home-assistant.io/t/smart-thermostat-2-0-blueprint/478348
  and made compatible with thermostats supporting the states "off" and "heat" instead of "off" and "auto" in the
  original blueprint.'
  domain: automation
  source_url: https://gist.github.com/rhl2401/f15d67263a949bbd5d6e374a3815a60d
  input:
    window_sensor:
      name: Window / Door Sensor Group
      selector:
        entity:
          domain: binary_sensor
          multiple: false
    window_delay:
      name: Window / Door Sensor Delay
      description: Time the sensor needs to stay the same after change to trigger
        the automation. This is done to avoid retriggering. (Default = 5s)
      default: 5
      selector:
        number:
          mode: box
          min: 0.0
          max: 3600.0
          unit_of_measurement: seconds
          step: 1.0
    weather:
      name: Weather
      description: Specify your weather to get the current outside temperature from.
      selector:
        entity:
          domain: weather
          multiple: false
    wintermode:
      name: Wintermode
      description: The ouside temperature needs to be below this to activate wintermode.
        (Default = 16°C)
      default: 16
      selector:
        number:
          step: 0.5
          min: 0.0
          max: 150.0
          unit_of_measurement: °C or °F
          mode: slider
    wintermode_delay:
      name: Wintermode Delay
      description: Time the outside temperature neeeds to stay above the wintermode
        temperature to turn the heating off.
      default: 30
      selector:
        number:
          mode: box
          min: 1.0
          max: 86400.0
          unit_of_measurement: minutes
          step: 1.0
    on_mode:
      name: ON Mode Name
      description: The name of the state for the thermostat to be on. Usually: auto, LUMI/Aqara: heat
      default: 'auto'
    off_mode: 
      name: OFF Mode Name
      description: The name of the state for the thermostat to be off. 
      default: 'off'
    thermostat:
      name: Thermostat
      selector:
        entity:
          domain: climate
          multiple: false
trigger:
- platform: state
  entity_id: !input window_sensor
  to: 'off'
  from: 'on'
  for: !input window_delay
- platform: state
  entity_id: !input window_sensor
  to: 'on'
  from: 'off'
  for: !input window_delay
- platform: numeric_state
  entity_id: !input weather
  attribute: temperature
  below: !input wintermode
  for: !input wintermode_delay
- platform: numeric_state
  entity_id: !input weather
  attribute: temperature
  above: !input wintermode
  for: !input wintermode_delay
action:
- choose:
  - conditions:
    - condition: and
      conditions:
      - condition: state
        entity_id: !input window_sensor
        state: 'off'
      - condition: numeric_state
        entity_id: !input weather
        attribute: temperature
        below: !input wintermode
    sequence:
    - service: climate.set_hvac_mode
      data:
        hvac_mode: !input on_mode
      entity_id: !input thermostat
  - conditions:
    - condition: or
      conditions:
      - condition: state
        entity_id: !input window_sensor
        state: 'on'
      - condition: numeric_state
        entity_id: !input weather
        attribute: temperature
        above: !input wintermode
    sequence:
    - service: climate.set_hvac_mode
      data:
        hvac_mode: !input off_mode
      entity_id: !input thermostat
  default: []