thermostat: move fan attribute up to thermostat

homeassistant/components/thermostat/nest.py

@@ -66,7 +66,6 @@ class NestThermostat(ThermostatDevice):
         return {
             "humidity": self.device.humidity,
             "target_humidity": self.device.target_humidity,
-            "fan": self.device.fan,
             "mode": self.device.mode
         }
 
@@ -143,6 +142,11 @@ class NestThermostat(ThermostatDevice):
         """ Turns away off. """
         self.structure.away = False
 
+    @property
+    def is_fan_on(self):
+        """ Returns whether the fan is on """
+        return self.device.fan
+
     @property
     def min_temp(self):
         """ Identifies min_temp in Nest API or defaults if not available. """