Home Assistant Blueprint for controlling your heater. Based on https://community.home-assistant.io/t/another-heating-control/259363 but without the person checks and using simple switch entities instead of climate control but plus checks on window sensors to avoid useless heating and price checks for dynamic energy pricing.

heating.yaml

blueprint:
  name: Heating Control
  description: Control your heating with options if temp is below a specific value,
    set temp, and heating between specific times.
  domain: automation
  input:
    heating:
      name: Climate Switch
      description: The climate switch to use.
      selector:
        entity:
          domain: switch
    temp_sensor:
      name: Temperature Sensor
      description: Temperature Sensor to check.
      selector:
        entity:
          domain: sensor
          device_class: temperature
    price_level_sensor:
      name: Energy Price Level Sensor
      description: Energy Price Level Sensor to check.
      selector:
        entity:
          domain: sensor
    price_level_percentage:
      name: Maximum Price Level Percentage
      description: The price level sensor should have an attribute called percentage, what should be the max based on the overall average price today
      default: 100
      selector:
        number:
          min: 0
          max: 150
          step: 10
          mode: slider
    min_temp:
      name: Minimum Temp
      description: If temperature is below this value it turns heating on.
      default: 15
      selector:
        number:
          min: 15.0
          max: 25.0
          step: 1.0
          mode: slider
    window_sensor:
      description: Window Binary Sensor to check if opened, only start heating when the window is closed. Entity can also be a group of window/door entities.
      selector:
        entity:
    time_after:
      name: Time After
      description: After this time the heating turns on, so it's warm in the morning
      default: 07:30:00
      selector:
        time: {}
    time_before:
      name: Time Before
      description: After this time the heating turns off, this to prevent the heating
        is on in the middle of the night
      default: '21:30:00'
      selector:
        time: {}
    run_on_monday:
      name: Run on Monday
      default: true
      selector:
        boolean: {}
    run_on_tuesday:
      name: Run on Tuesday
      default: true
      selector:
        boolean: {}
    run_on_wednesday:
      name: Run on Wednesday
      default: true
      selector:
        boolean: {}
    run_on_thursday:
      name: Run on Thursday
      default: true
      selector:
        boolean: {}
    run_on_friday:
      name: Run on Friday
      default: true
      selector:
        boolean: {}
    run_on_saturday:
      name: Run on Saturday
      default: true
      selector:
        boolean: {}
    run_on_sunday:
      name: Run on Sunday
      default: true
      selector:
        boolean: {}
  source_url: https://gist.github.com/robsonke/850ca17a2ca3417601ae0f73d523cc34
variables:
  current_day: '{{ now().weekday() | int }}'
  price_level_percentage: !input price_level_percentage
  price_level_sensor: !input price_level_sensor
  run_on_monday: !input run_on_monday
  run_on_tuesday: !input run_on_tuesday
  run_on_wednesday: !input run_on_wednesday
  run_on_thursday: !input run_on_thursday
  run_on_friday: !input run_on_friday
  run_on_saturday: !input run_on_saturday
  run_on_sunday: !input run_on_sunday
  window_sensor: !input window_sensor
trigger_variables:
  run_on_monday: !input run_on_monday
  run_on_tuesday: !input run_on_tuesday
  run_on_wednesday: !input run_on_wednesday
  run_on_thursday: !input run_on_thursday
  run_on_friday: !input run_on_friday
  run_on_saturday: !input run_on_saturday
  run_on_sunday: !input run_on_sunday
trigger:
- platform: homeassistant
  event: start
- platform: event
  event_type: automation_reloaded
- platform: time_pattern
  minutes: /10
- platform: state
  entity_id: !input price_level_sensor
condition:
- condition: template
  value_template: "{{ \n  (current_day == 0 and run_on_monday) or \n  (current_day\
    \ == 1 and run_on_tuesday) or \n  (current_day == 2 and run_on_wednesday) or\n\
    \  (current_day == 3 and run_on_thursday) or \n  (current_day == 4 and run_on_friday)\
    \ or\n  (current_day == 5 and run_on_saturday) or\n  (current_day == 6 and run_on_sunday)\n\
    }}"
action:
- choose:
  - conditions:
    - condition: numeric_state
      entity_id: !input 'temp_sensor'
      below: !input 'min_temp'
    - condition: time
      before: !input 'time_before'
      after: !input 'time_after'
    - condition: template
      value_template: "{{ window_sensor is not defined or states[window_sensor].state == 'off' }}"
    - condition: numeric_state
      entity_id: !input price_level_sensor
      attribute: percentage
      below: !input price_level_percentage
    sequence:
    - service: switch.turn_on
      data:
        entity_id: !input 'heating'
  default:
  - service: switch.turn_off
    data:
      entity_id: !input 'heating'
mode: single
max_exceeded: silent