diff --git a/homeassistant/components/homekit/type_air_purifiers.py b/homeassistant/components/homekit/type_air_purifiers.py
index 25d305a0aa9..feb75f4a856 100644
--- a/homeassistant/components/homekit/type_air_purifiers.py
+++ b/homeassistant/components/homekit/type_air_purifiers.py
@@ -8,7 +8,13 @@ from pyhap.const import CATEGORY_AIR_PURIFIER
 from pyhap.service import Service
 from pyhap.util import callback as pyhap_callback
 
-from homeassistant.const import STATE_ON, STATE_UNAVAILABLE, STATE_UNKNOWN
+from homeassistant.const import (
+    ATTR_UNIT_OF_MEASUREMENT,
+    STATE_ON,
+    STATE_UNAVAILABLE,
+    STATE_UNKNOWN,
+    UnitOfTemperature,
+)
 from homeassistant.core import (
     Event,
     EventStateChangedData,
@@ -43,7 +49,12 @@ from .const import (
     THRESHOLD_FILTER_CHANGE_NEEDED,
 )
 from .type_fans import ATTR_PRESET_MODE, CHAR_ROTATION_SPEED, Fan
-from .util import cleanup_name_for_homekit, convert_to_float, density_to_air_quality
+from .util import (
+    cleanup_name_for_homekit,
+    convert_to_float,
+    density_to_air_quality,
+    temperature_to_homekit,
+)
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -345,8 +356,13 @@ class AirPurifier(Fan):
         ):
             return
 
+        unit = new_state.attributes.get(
+            ATTR_UNIT_OF_MEASUREMENT, UnitOfTemperature.CELSIUS
+        )
+        current_temperature = temperature_to_homekit(current_temperature, unit)
+
         _LOGGER.debug(
-            "%s: Linked temperature sensor %s changed to %d",
+            "%s: Linked temperature sensor %s changed to %d °C",
             self.entity_id,
             self.linked_temperature_sensor,
             current_temperature,
diff --git a/tests/components/homekit/test_type_air_purifiers.py b/tests/components/homekit/test_type_air_purifiers.py
index 90b0e0047de..acc7838652d 100644
--- a/tests/components/homekit/test_type_air_purifiers.py
+++ b/tests/components/homekit/test_type_air_purifiers.py
@@ -34,9 +34,11 @@ from homeassistant.const import (
     ATTR_DEVICE_CLASS,
     ATTR_ENTITY_ID,
     ATTR_SUPPORTED_FEATURES,
+    ATTR_UNIT_OF_MEASUREMENT,
     STATE_OFF,
     STATE_ON,
     STATE_UNAVAILABLE,
+    UnitOfTemperature,
 )
 from homeassistant.core import Event, HomeAssistant
 
@@ -437,6 +439,22 @@ async def test_expose_linked_sensors(
     assert acc.char_air_quality.value == 1
     assert len(broker.mock_calls) == 0
 
+    # Updated temperature with different unit should reflect in HomeKit
+    broker = MagicMock()
+    acc.char_current_temperature.broker = broker
+    hass.states.async_set(
+        temperature_entity_id,
+        60,
+        {
+            ATTR_DEVICE_CLASS: SensorDeviceClass.TEMPERATURE,
+            ATTR_UNIT_OF_MEASUREMENT: UnitOfTemperature.FAHRENHEIT,
+        },
+    )
+    await hass.async_block_till_done()
+    assert acc.char_current_temperature.value == 15.6
+    assert len(broker.mock_calls) == 2
+    broker.reset_mock()
+
     # Updated temperature should reflect in HomeKit
     broker = MagicMock()
     acc.char_current_temperature.broker = broker