diff --git a/homeassistant/components/mill/sensor.py b/homeassistant/components/mill/sensor.py
index 64db26c371c..6d53ae22a4e 100644
--- a/homeassistant/components/mill/sensor.py
+++ b/homeassistant/components/mill/sensor.py
@@ -4,13 +4,9 @@ from __future__ import annotations
 import mill
 
 from homeassistant.components.sensor import (
-    DEVICE_CLASS_BATTERY,
-    DEVICE_CLASS_CO2,
-    DEVICE_CLASS_ENERGY,
-    DEVICE_CLASS_HUMIDITY,
-    DEVICE_CLASS_TEMPERATURE,
     STATE_CLASS_MEASUREMENT,
     STATE_CLASS_TOTAL_INCREASING,
+    SensorDeviceClass,
     SensorEntity,
     SensorEntityDescription,
 )
@@ -45,14 +41,14 @@ from .const import (
 HEATER_SENSOR_TYPES: tuple[SensorEntityDescription, ...] = (
     SensorEntityDescription(
         key=CONSUMPTION_YEAR,
-        device_class=DEVICE_CLASS_ENERGY,
+        device_class=SensorDeviceClass.ENERGY,
         native_unit_of_measurement=ENERGY_KILO_WATT_HOUR,
         state_class=STATE_CLASS_TOTAL_INCREASING,
         name="Year consumption",
     ),
     SensorEntityDescription(
         key=CONSUMPTION_TODAY,
-        device_class=DEVICE_CLASS_ENERGY,
+        device_class=SensorDeviceClass.ENERGY,
         native_unit_of_measurement=ENERGY_KILO_WATT_HOUR,
         state_class=STATE_CLASS_TOTAL_INCREASING,
         name="Day consumption",
@@ -62,21 +58,21 @@ HEATER_SENSOR_TYPES: tuple[SensorEntityDescription, ...] = (
 SENSOR_TYPES: tuple[SensorEntityDescription, ...] = (
     SensorEntityDescription(
         key=TEMPERATURE,
-        device_class=DEVICE_CLASS_TEMPERATURE,
+        device_class=SensorDeviceClass.TEMPERATURE,
         native_unit_of_measurement=TEMP_CELSIUS,
         name="Temperature",
         state_class=STATE_CLASS_MEASUREMENT,
     ),
     SensorEntityDescription(
         key=HUMIDITY,
-        device_class=DEVICE_CLASS_HUMIDITY,
+        device_class=SensorDeviceClass.HUMIDITY,
         native_unit_of_measurement=PERCENTAGE,
         name="Humidity",
         state_class=STATE_CLASS_MEASUREMENT,
     ),
     SensorEntityDescription(
         key=BATTERY,
-        device_class=DEVICE_CLASS_BATTERY,
+        device_class=SensorDeviceClass.BATTERY,
         native_unit_of_measurement=PERCENTAGE,
         name="Battery",
         state_class=STATE_CLASS_MEASUREMENT,
@@ -84,7 +80,7 @@ SENSOR_TYPES: tuple[SensorEntityDescription, ...] = (
     ),
     SensorEntityDescription(
         key=ECO2,
-        device_class=DEVICE_CLASS_CO2,
+        device_class=SensorDeviceClass.CO2,
         native_unit_of_measurement=CONCENTRATION_PARTS_PER_MILLION,
         name="Estimated CO2",
     ),