input: Write a python function to simulate sensor checks and system adjustments.
  assert check_sensors() is None
  assert adjust_heater() is None
  assert adjust_dehumidifier() is None
  assert shut_down_system() is None
output: def check_sensors():
      # Simulate sensor check logic
      print("Checking sensors...")
  
  def adjust_heater():
      # Simulate heater adjustment logic
      print("Adjusting heater...")
  
  def adjust_dehumidifier():
      # Simulate dehumidifier adjustment logic
      print("Adjusting dehumidifier...")
  
  def shut_down_system():
      # Simulate system shutdown logic
      print("Shutting down system...")