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

smart-thermostat.yaml

blueprint:
  name: Smart thermostat with delay
  description: 'This automation uses your window sensor to control the thermostat, turning it on or off based on the window state. You can set the delay time for state changes to avoid retriggering. To prevent heating in summer, specify the weather entity and your winter temperature. Additionally, you can set a delay for resuming heating in winter to avoid triggering full power heating immediately after a window is closed.'
  domain: automation
  source_url: https://gist.github.com/AlexanderBabel/69c3b996a66b3a132cafadcbac4140cc
  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: 1800
      selector:
        number:
          mode: box
          min: 1.0
          max: 86400.0
          unit_of_measurement: seconds
          step: 1.0
    return_delay:
      name: Return Delay
      description: Time to wait before returning the heating to auto after the window is closed.
      default: 1200  # Default is 20 minutes
      selector:
        number:
          mode: box
          min: 0.0
          max: 86400.0
          unit_of_measurement: seconds
          step: 1.0
    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:
    - delay: !input return_delay
    - service: climate.set_hvac_mode
      data:
        hvac_mode: auto
      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: 'off'
      entity_id: !input thermostat
  default: []