Updates to demo component and platforms

homeassistant/components/thermostat/demo.py

@@ -26,6 +26,11 @@ class DemoThermostat(ThermostatDevice):
         self._away = away
         self._current_temperature = current_temperature
 
+    @property
+    def should_poll(self):
+        """ No polling needed for a demo thermostat. """
+        return False
+
     @property
     def name(self):
         """ Returns the name. """