diff --git a/homeassistant/components/lcn/sensor.py b/homeassistant/components/lcn/sensor.py
index ee87ed2a91b..7783df8679a 100644
--- a/homeassistant/components/lcn/sensor.py
+++ b/homeassistant/components/lcn/sensor.py
@@ -3,7 +3,6 @@
 from collections.abc import Iterable
 from functools import partial
 from itertools import chain
-from typing import cast
 
 import pypck
 
@@ -18,6 +17,11 @@ from homeassistant.const import (
     CONF_ENTITIES,
     CONF_SOURCE,
     CONF_UNIT_OF_MEASUREMENT,
+    LIGHT_LUX,
+    UnitOfElectricCurrent,
+    UnitOfElectricPotential,
+    UnitOfSpeed,
+    UnitOfTemperature,
 )
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.entity_platform import AddConfigEntryEntitiesCallback
@@ -47,6 +51,17 @@ DEVICE_CLASS_MAPPING = {
     pypck.lcn_defs.VarUnit.AMPERE: SensorDeviceClass.CURRENT,
 }
 
+UNIT_OF_MEASUREMENT_MAPPING = {
+    pypck.lcn_defs.VarUnit.CELSIUS: UnitOfTemperature.CELSIUS,
+    pypck.lcn_defs.VarUnit.KELVIN: UnitOfTemperature.KELVIN,
+    pypck.lcn_defs.VarUnit.FAHRENHEIT: UnitOfTemperature.FAHRENHEIT,
+    pypck.lcn_defs.VarUnit.LUX_T: LIGHT_LUX,
+    pypck.lcn_defs.VarUnit.LUX_I: LIGHT_LUX,
+    pypck.lcn_defs.VarUnit.METERPERSECOND: UnitOfSpeed.METERS_PER_SECOND,
+    pypck.lcn_defs.VarUnit.VOLT: UnitOfElectricPotential.VOLT,
+    pypck.lcn_defs.VarUnit.AMPERE: UnitOfElectricCurrent.AMPERE,
+}
+
 
 def add_lcn_entities(
     config_entry: ConfigEntry,
@@ -103,8 +118,10 @@ class LcnVariableSensor(LcnEntity, SensorEntity):
             config[CONF_DOMAIN_DATA][CONF_UNIT_OF_MEASUREMENT]
         )
 
-        self._attr_native_unit_of_measurement = cast(str, self.unit.value)
-        self._attr_device_class = DEVICE_CLASS_MAPPING.get(self.unit, None)
+        self._attr_native_unit_of_measurement = UNIT_OF_MEASUREMENT_MAPPING.get(
+            self.unit
+        )
+        self._attr_device_class = DEVICE_CLASS_MAPPING.get(self.unit)
 
     async def async_added_to_hass(self) -> None:
         """Run when entity about to be added to hass."""