diff --git a/homeassistant/components/demo/climate.py b/homeassistant/components/demo/climate.py
index 91594423744..52616d4cf47 100644
--- a/homeassistant/components/demo/climate.py
+++ b/homeassistant/components/demo/climate.py
@@ -128,26 +128,22 @@ class DemoClimate(ClimateEntity):
         """Initialize the climate device."""
         self._unique_id = unique_id
         self._attr_name = name
-        self._support_flags = SUPPORT_FLAGS
+        self._attr_supported_features = SUPPORT_FLAGS
         if target_temperature is not None:
-            self._support_flags = (
-                self._support_flags | ClimateEntityFeature.TARGET_TEMPERATURE
-            )
+            self._attr_supported_features |= ClimateEntityFeature.TARGET_TEMPERATURE
         if preset is not None:
-            self._support_flags = self._support_flags | ClimateEntityFeature.PRESET_MODE
+            self._attr_supported_features |= ClimateEntityFeature.PRESET_MODE
         if fan_mode is not None:
-            self._support_flags = self._support_flags | ClimateEntityFeature.FAN_MODE
+            self._attr_supported_features |= ClimateEntityFeature.FAN_MODE
         if target_humidity is not None:
-            self._support_flags = (
-                self._support_flags | ClimateEntityFeature.TARGET_HUMIDITY
-            )
+            self._attr_supported_features |= ClimateEntityFeature.TARGET_HUMIDITY
         if swing_mode is not None:
-            self._support_flags = self._support_flags | ClimateEntityFeature.SWING_MODE
+            self._attr_supported_features |= ClimateEntityFeature.SWING_MODE
         if aux is not None:
-            self._support_flags = self._support_flags | ClimateEntityFeature.AUX_HEAT
+            self._attr_supported_features |= ClimateEntityFeature.AUX_HEAT
         if HVACMode.HEAT_COOL in hvac_modes or HVACMode.AUTO in hvac_modes:
-            self._support_flags = (
-                self._support_flags | ClimateEntityFeature.TARGET_TEMPERATURE_RANGE
+            self._attr_supported_features |= (
+                ClimateEntityFeature.TARGET_TEMPERATURE_RANGE
             )
         self._target_temperature = target_temperature
         self._target_humidity = target_humidity
@@ -183,11 +179,6 @@ class DemoClimate(ClimateEntity):
         """Return the unique id."""
         return self._unique_id
 
-    @property
-    def supported_features(self) -> int:
-        """Return the list of supported features."""
-        return self._support_flags
-
     @property
     def temperature_unit(self) -> str:
         """Return the unit of measurement."""