diff --git a/homeassistant/components/demo/__init__.py b/homeassistant/components/demo/__init__.py
index ae6912fa0f9..dd3bf8d94d7 100644
--- a/homeassistant/components/demo/__init__.py
+++ b/homeassistant/components/demo/__init__.py
@@ -16,14 +16,12 @@ from homeassistant.components.recorder.statistics import (
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import (
     ATTR_ENTITY_ID,
-    ENERGY_KILO_WATT_HOUR,
-    ENERGY_MEGA_WATT_HOUR,
     EVENT_HOMEASSISTANT_START,
     SOUND_PRESSURE_DB,
-    TEMP_CELSIUS,
-    VOLUME_CUBIC_FEET,
-    VOLUME_CUBIC_METERS,
     Platform,
+    UnitOfEnergy,
+    UnitOfTemperature,
+    UnitOfVolume,
 )
 import homeassistant.core as ha
 from homeassistant.core import Event, HomeAssistant
@@ -306,7 +304,7 @@ async def _insert_statistics(hass: HomeAssistant) -> None:
         "source": DOMAIN,
         "name": "Outdoor temperature",
         "statistic_id": f"{DOMAIN}:temperature_outdoor",
-        "unit_of_measurement": TEMP_CELSIUS,
+        "unit_of_measurement": UnitOfTemperature.CELSIUS,
         "has_mean": True,
         "has_sum": False,
     }
@@ -319,7 +317,7 @@ async def _insert_statistics(hass: HomeAssistant) -> None:
         "source": DOMAIN,
         "name": "Energy consumption 1",
         "statistic_id": f"{DOMAIN}:energy_consumption_kwh",
-        "unit_of_measurement": ENERGY_KILO_WATT_HOUR,
+        "unit_of_measurement": UnitOfEnergy.KILO_WATT_HOUR,
         "has_mean": False,
         "has_sum": True,
     }
@@ -331,7 +329,7 @@ async def _insert_statistics(hass: HomeAssistant) -> None:
         "source": DOMAIN,
         "name": "Energy consumption 2",
         "statistic_id": f"{DOMAIN}:energy_consumption_mwh",
-        "unit_of_measurement": ENERGY_MEGA_WATT_HOUR,
+        "unit_of_measurement": UnitOfEnergy.MEGA_WATT_HOUR,
         "has_mean": False,
         "has_sum": True,
     }
@@ -345,7 +343,7 @@ async def _insert_statistics(hass: HomeAssistant) -> None:
         "source": DOMAIN,
         "name": "Gas consumption 1",
         "statistic_id": f"{DOMAIN}:gas_consumption_m3",
-        "unit_of_measurement": VOLUME_CUBIC_METERS,
+        "unit_of_measurement": UnitOfVolume.CUBIC_METERS,
         "has_mean": False,
         "has_sum": True,
     }
@@ -359,7 +357,7 @@ async def _insert_statistics(hass: HomeAssistant) -> None:
         "source": DOMAIN,
         "name": "Gas consumption 2",
         "statistic_id": f"{DOMAIN}:gas_consumption_ft3",
-        "unit_of_measurement": VOLUME_CUBIC_FEET,
+        "unit_of_measurement": UnitOfVolume.CUBIC_FEET,
         "has_mean": False,
         "has_sum": True,
     }
diff --git a/homeassistant/components/demo/climate.py b/homeassistant/components/demo/climate.py
index 00e049c6034..e41ca35fca2 100644
--- a/homeassistant/components/demo/climate.py
+++ b/homeassistant/components/demo/climate.py
@@ -12,7 +12,7 @@ from homeassistant.components.climate import (
     HVACMode,
 )
 from homeassistant.config_entries import ConfigEntry
-from homeassistant.const import ATTR_TEMPERATURE, TEMP_CELSIUS, TEMP_FAHRENHEIT
+from homeassistant.const import ATTR_TEMPERATURE, UnitOfTemperature
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.entity import DeviceInfo
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
@@ -36,7 +36,7 @@ async def async_setup_platform(
                 unique_id="climate_1",
                 name="HeatPump",
                 target_temperature=68,
-                unit_of_measurement=TEMP_FAHRENHEIT,
+                unit_of_measurement=UnitOfTemperature.FAHRENHEIT,
                 preset=None,
                 current_temperature=77,
                 fan_mode=None,
@@ -54,7 +54,7 @@ async def async_setup_platform(
                 unique_id="climate_2",
                 name="Hvac",
                 target_temperature=21,
-                unit_of_measurement=TEMP_CELSIUS,
+                unit_of_measurement=UnitOfTemperature.CELSIUS,
                 preset=None,
                 current_temperature=22,
                 fan_mode="On High",
@@ -72,7 +72,7 @@ async def async_setup_platform(
                 unique_id="climate_3",
                 name="Ecobee",
                 target_temperature=None,
-                unit_of_measurement=TEMP_CELSIUS,
+                unit_of_measurement=UnitOfTemperature.CELSIUS,
                 preset="home",
                 preset_modes=["home", "eco"],
                 current_temperature=23,
diff --git a/homeassistant/components/demo/geo_location.py b/homeassistant/components/demo/geo_location.py
index c47f4e49d4a..cc29205b720 100644
--- a/homeassistant/components/demo/geo_location.py
+++ b/homeassistant/components/demo/geo_location.py
@@ -7,7 +7,7 @@ from math import cos, pi, radians, sin
 import random
 
 from homeassistant.components.geo_location import GeolocationEvent
-from homeassistant.const import LENGTH_KILOMETERS
+from homeassistant.const import UnitOfLength
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 from homeassistant.helpers.event import track_time_interval
@@ -80,7 +80,7 @@ class DemoManager:
 
         event_name = random.choice(EVENT_NAMES)
         return DemoGeolocationEvent(
-            event_name, radius_in_km, latitude, longitude, LENGTH_KILOMETERS
+            event_name, radius_in_km, latitude, longitude, UnitOfLength.KILOMETERS
         )
 
     def _init_regular_updates(self) -> None:
diff --git a/homeassistant/components/demo/number.py b/homeassistant/components/demo/number.py
index 9613aa247fb..25ed7347bda 100644
--- a/homeassistant/components/demo/number.py
+++ b/homeassistant/components/demo/number.py
@@ -3,7 +3,7 @@ from __future__ import annotations
 
 from homeassistant.components.number import NumberDeviceClass, NumberEntity, NumberMode
 from homeassistant.config_entries import ConfigEntry
-from homeassistant.const import DEVICE_DEFAULT_NAME, TEMP_CELSIUS
+from homeassistant.const import DEVICE_DEFAULT_NAME, UnitOfTemperature
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.entity import DeviceInfo
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
@@ -71,7 +71,7 @@ async def async_setup_platform(
                 native_max_value=35.0,
                 native_step=1,
                 mode=NumberMode.BOX,
-                unit_of_measurement=TEMP_CELSIUS,
+                unit_of_measurement=UnitOfTemperature.CELSIUS,
             ),
         ]
     )
diff --git a/homeassistant/components/demo/sensor.py b/homeassistant/components/demo/sensor.py
index 59012554f29..a7391a055fa 100644
--- a/homeassistant/components/demo/sensor.py
+++ b/homeassistant/components/demo/sensor.py
@@ -15,13 +15,11 @@ from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import (
     ATTR_BATTERY_LEVEL,
     CONCENTRATION_PARTS_PER_MILLION,
-    ENERGY_KILO_WATT_HOUR,
-    ENERGY_MEGA_WATT_HOUR,
     PERCENTAGE,
-    POWER_WATT,
-    TEMP_CELSIUS,
-    VOLUME_CUBIC_FEET,
-    VOLUME_CUBIC_METERS,
+    UnitOfEnergy,
+    UnitOfPower,
+    UnitOfTemperature,
+    UnitOfVolume,
 )
 from homeassistant.core import HomeAssistant, callback
 from homeassistant.helpers.entity import DeviceInfo
@@ -47,7 +45,7 @@ async def async_setup_platform(
                 15.6,
                 SensorDeviceClass.TEMPERATURE,
                 SensorStateClass.MEASUREMENT,
-                TEMP_CELSIUS,
+                UnitOfTemperature.CELSIUS,
                 12,
             ),
             DemoSensor(
@@ -83,7 +81,7 @@ async def async_setup_platform(
                 100,
                 SensorDeviceClass.POWER,
                 SensorStateClass.MEASUREMENT,
-                POWER_WATT,
+                UnitOfPower.WATT,
                 None,
             ),
             DemoSumSensor(
@@ -92,7 +90,7 @@ async def async_setup_platform(
                 0.5,  # 6kWh / h
                 SensorDeviceClass.ENERGY,
                 SensorStateClass.TOTAL,
-                ENERGY_KILO_WATT_HOUR,
+                UnitOfEnergy.KILO_WATT_HOUR,
                 None,
                 "total_energy_kwh",
             ),
@@ -102,7 +100,7 @@ async def async_setup_platform(
                 0.00025,  # 0.003 MWh/h (3 kWh / h)
                 SensorDeviceClass.ENERGY,
                 SensorStateClass.TOTAL,
-                ENERGY_MEGA_WATT_HOUR,
+                UnitOfEnergy.MEGA_WATT_HOUR,
                 None,
                 "total_energy_mwh",
             ),
@@ -112,7 +110,7 @@ async def async_setup_platform(
                 0.025,  # 0.30 m³/h (10.6 ft³ / h)
                 SensorDeviceClass.GAS,
                 SensorStateClass.TOTAL,
-                VOLUME_CUBIC_METERS,
+                UnitOfVolume.CUBIC_METERS,
                 None,
                 "total_gas_m3",
             ),
@@ -122,7 +120,7 @@ async def async_setup_platform(
                 1.0,  # 12 ft³/h (0.34 m³ / h)
                 SensorDeviceClass.GAS,
                 SensorStateClass.TOTAL,
-                VOLUME_CUBIC_FEET,
+                UnitOfVolume.CUBIC_FEET,
                 None,
                 "total_gas_ft3",
             ),
diff --git a/homeassistant/components/demo/water_heater.py b/homeassistant/components/demo/water_heater.py
index 1fc164d5046..a21f492c439 100644
--- a/homeassistant/components/demo/water_heater.py
+++ b/homeassistant/components/demo/water_heater.py
@@ -8,7 +8,7 @@ from homeassistant.components.water_heater import (
     WaterHeaterEntityFeature,
 )
 from homeassistant.config_entries import ConfigEntry
-from homeassistant.const import ATTR_TEMPERATURE, TEMP_CELSIUS, TEMP_FAHRENHEIT
+from homeassistant.const import ATTR_TEMPERATURE, UnitOfTemperature
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
@@ -29,8 +29,12 @@ async def async_setup_platform(
     """Set up the Demo water_heater devices."""
     async_add_entities(
         [
-            DemoWaterHeater("Demo Water Heater", 119, TEMP_FAHRENHEIT, False, "eco"),
-            DemoWaterHeater("Demo Water Heater Celsius", 45, TEMP_CELSIUS, True, "eco"),
+            DemoWaterHeater(
+                "Demo Water Heater", 119, UnitOfTemperature.FAHRENHEIT, False, "eco"
+            ),
+            DemoWaterHeater(
+                "Demo Water Heater Celsius", 45, UnitOfTemperature.CELSIUS, True, "eco"
+            ),
         ]
     )