diff --git a/homeassistant/components/homekit_controller/const.py b/homeassistant/components/homekit_controller/const.py
index b3c55ba36a9..c3af1033148 100644
--- a/homeassistant/components/homekit_controller/const.py
+++ b/homeassistant/components/homekit_controller/const.py
@@ -25,6 +25,7 @@ HOMEKIT_ACCESSORY_DISPATCH = {
     "motion": "binary_sensor",
     "carbon-dioxide": "sensor",
     "humidity": "sensor",
+    "humidifier-dehumidifier": "humidifier",
     "light": "sensor",
     "temperature": "sensor",
     "battery": "sensor",
diff --git a/homeassistant/components/homekit_controller/humidifier.py b/homeassistant/components/homekit_controller/humidifier.py
new file mode 100644
index 00000000000..10ffee198e4
--- /dev/null
+++ b/homeassistant/components/homekit_controller/humidifier.py
@@ -0,0 +1,304 @@
+"""Support for HomeKit Controller humidifier."""
+from typing import List, Optional
+
+from aiohomekit.model.characteristics import CharacteristicsTypes
+
+from homeassistant.components.humidifier import HumidifierEntity
+from homeassistant.components.humidifier.const import (
+    DEVICE_CLASS_DEHUMIDIFIER,
+    DEVICE_CLASS_HUMIDIFIER,
+    MODE_AUTO,
+    MODE_NORMAL,
+    SUPPORT_MODES,
+)
+from homeassistant.core import callback
+
+from . import KNOWN_DEVICES, HomeKitEntity
+
+SUPPORT_FLAGS = 0
+
+HK_MODE_TO_HA = {
+    0: "off",
+    1: MODE_AUTO,
+    2: "humidifying",
+    3: "dehumidifying",
+}
+
+HA_MODE_TO_HK = {
+    MODE_AUTO: 0,
+    "humidifying": 1,
+    "dehumidifying": 2,
+}
+
+
+class HomeKitHumidifier(HomeKitEntity, HumidifierEntity):
+    """Representation of a HomeKit Controller Humidifier."""
+
+    def get_characteristic_types(self):
+        """Define the homekit characteristics the entity cares about."""
+        return [
+            CharacteristicsTypes.ACTIVE,
+            CharacteristicsTypes.RELATIVE_HUMIDITY_CURRENT,
+            CharacteristicsTypes.CURRENT_HUMIDIFIER_DEHUMIDIFIER_STATE,
+            CharacteristicsTypes.TARGET_HUMIDIFIER_DEHUMIDIFIER_STATE,
+            CharacteristicsTypes.RELATIVE_HUMIDITY_HUMIDIFIER_THRESHOLD,
+        ]
+
+    @property
+    def device_class(self) -> str:
+        """Return the device class of the device."""
+        return DEVICE_CLASS_HUMIDIFIER
+
+    @property
+    def supported_features(self):
+        """Return the list of supported features."""
+        return SUPPORT_FLAGS | SUPPORT_MODES
+
+    @property
+    def is_on(self):
+        """Return true if device is on."""
+        return self.service.value(CharacteristicsTypes.ACTIVE)
+
+    async def async_turn_on(self, **kwargs):
+        """Turn the specified valve on."""
+        await self.async_put_characteristics({CharacteristicsTypes.ACTIVE: True})
+
+    async def async_turn_off(self, **kwargs):
+        """Turn the specified valve off."""
+        await self.async_put_characteristics({CharacteristicsTypes.ACTIVE: False})
+
+    @property
+    def target_humidity(self) -> Optional[int]:
+        """Return the humidity we try to reach."""
+        return self.service.value(
+            CharacteristicsTypes.RELATIVE_HUMIDITY_HUMIDIFIER_THRESHOLD
+        )
+
+    @property
+    def mode(self) -> Optional[str]:
+        """Return the current mode, e.g., home, auto, baby.
+
+        Requires SUPPORT_MODES.
+        """
+        mode = self.service.value(
+            CharacteristicsTypes.CURRENT_HUMIDIFIER_DEHUMIDIFIER_STATE
+        )
+        return MODE_AUTO if mode == 1 else MODE_NORMAL
+
+    @property
+    def available_modes(self) -> Optional[List[str]]:
+        """Return a list of available modes.
+
+        Requires SUPPORT_MODES.
+        """
+        available_modes = [
+            MODE_NORMAL,
+            MODE_AUTO,
+        ]
+
+        return available_modes
+
+    async def async_set_humidity(self, humidity: int) -> None:
+        """Set new target humidity."""
+        await self.async_put_characteristics(
+            {CharacteristicsTypes.RELATIVE_HUMIDITY_HUMIDIFIER_THRESHOLD: humidity}
+        )
+
+    async def async_set_mode(self, mode: str) -> None:
+        """Set new mode."""
+        if mode == MODE_AUTO:
+            await self.async_put_characteristics(
+                {
+                    CharacteristicsTypes.TARGET_HUMIDIFIER_DEHUMIDIFIER_STATE: 0,
+                    CharacteristicsTypes.ACTIVE: True,
+                }
+            )
+        else:
+            await self.async_put_characteristics(
+                {
+                    CharacteristicsTypes.TARGET_HUMIDIFIER_DEHUMIDIFIER_STATE: 1,
+                    CharacteristicsTypes.ACTIVE: True,
+                }
+            )
+
+    @property
+    def min_humidity(self) -> int:
+        """Return the minimum humidity."""
+        return self.service[
+            CharacteristicsTypes.RELATIVE_HUMIDITY_HUMIDIFIER_THRESHOLD
+        ].minValue
+
+    @property
+    def max_humidity(self) -> int:
+        """Return the maximum humidity."""
+        return self.service[
+            CharacteristicsTypes.RELATIVE_HUMIDITY_HUMIDIFIER_THRESHOLD
+        ].maxValue
+
+
+class HomeKitDehumidifier(HomeKitEntity, HumidifierEntity):
+    """Representation of a HomeKit Controller Humidifier."""
+
+    def get_characteristic_types(self):
+        """Define the homekit characteristics the entity cares about."""
+        return [
+            CharacteristicsTypes.ACTIVE,
+            CharacteristicsTypes.RELATIVE_HUMIDITY_CURRENT,
+            CharacteristicsTypes.CURRENT_HUMIDIFIER_DEHUMIDIFIER_STATE,
+            CharacteristicsTypes.TARGET_HUMIDIFIER_DEHUMIDIFIER_STATE,
+            CharacteristicsTypes.RELATIVE_HUMIDITY_HUMIDIFIER_THRESHOLD,
+            CharacteristicsTypes.RELATIVE_HUMIDITY_DEHUMIDIFIER_THRESHOLD,
+        ]
+
+    @property
+    def device_class(self) -> str:
+        """Return the device class of the device."""
+        return DEVICE_CLASS_DEHUMIDIFIER
+
+    @property
+    def supported_features(self):
+        """Return the list of supported features."""
+        return SUPPORT_FLAGS | SUPPORT_MODES
+
+    @property
+    def is_on(self):
+        """Return true if device is on."""
+        return self.service.value(CharacteristicsTypes.ACTIVE)
+
+    async def async_turn_on(self, **kwargs):
+        """Turn the specified valve on."""
+        await self.async_put_characteristics({CharacteristicsTypes.ACTIVE: True})
+
+    async def async_turn_off(self, **kwargs):
+        """Turn the specified valve off."""
+        await self.async_put_characteristics({CharacteristicsTypes.ACTIVE: False})
+
+    @property
+    def target_humidity(self) -> Optional[int]:
+        """Return the humidity we try to reach."""
+        return self.service.value(
+            CharacteristicsTypes.RELATIVE_HUMIDITY_DEHUMIDIFIER_THRESHOLD
+        )
+
+    @property
+    def mode(self) -> Optional[str]:
+        """Return the current mode, e.g., home, auto, baby.
+
+        Requires SUPPORT_MODES.
+        """
+        mode = self.service.value(
+            CharacteristicsTypes.CURRENT_HUMIDIFIER_DEHUMIDIFIER_STATE
+        )
+        return MODE_AUTO if mode == 1 else MODE_NORMAL
+
+    @property
+    def available_modes(self) -> Optional[List[str]]:
+        """Return a list of available modes.
+
+        Requires SUPPORT_MODES.
+        """
+        available_modes = [
+            MODE_NORMAL,
+            MODE_AUTO,
+        ]
+
+        return available_modes
+
+    async def async_set_humidity(self, humidity: int) -> None:
+        """Set new target humidity."""
+        await self.async_put_characteristics(
+            {CharacteristicsTypes.RELATIVE_HUMIDITY_DEHUMIDIFIER_THRESHOLD: humidity}
+        )
+
+    async def async_set_mode(self, mode: str) -> None:
+        """Set new mode."""
+        if mode == MODE_AUTO:
+            await self.async_put_characteristics(
+                {
+                    CharacteristicsTypes.TARGET_HUMIDIFIER_DEHUMIDIFIER_STATE: 0,
+                    CharacteristicsTypes.ACTIVE: True,
+                }
+            )
+        else:
+            await self.async_put_characteristics(
+                {
+                    CharacteristicsTypes.TARGET_HUMIDIFIER_DEHUMIDIFIER_STATE: 2,
+                    CharacteristicsTypes.ACTIVE: True,
+                }
+            )
+
+    @property
+    def min_humidity(self) -> int:
+        """Return the minimum humidity."""
+        return self.service[
+            CharacteristicsTypes.RELATIVE_HUMIDITY_DEHUMIDIFIER_THRESHOLD
+        ].minValue
+
+    @property
+    def max_humidity(self) -> int:
+        """Return the maximum humidity."""
+        return self.service[
+            CharacteristicsTypes.RELATIVE_HUMIDITY_DEHUMIDIFIER_THRESHOLD
+        ].maxValue
+
+    @property
+    def unique_id(self) -> str:
+        """Return the ID of this device."""
+        serial = self.accessory_info.value(CharacteristicsTypes.SERIAL_NUMBER)
+        return f"homekit-{serial}-{self._iid}-{self.device_class}"
+
+
+async def async_setup_entry(hass, config_entry, async_add_entities):
+    """Set up Homekit humidifer."""
+    hkid = config_entry.data["AccessoryPairingID"]
+    conn = hass.data[KNOWN_DEVICES][hkid]
+
+    def get_accessory(conn, aid):
+        for acc in conn.accessories:
+            if acc.get("aid") == aid:
+                return acc
+        return None
+
+    def get_service(acc, iid):
+        for serv in acc.get("services"):
+            if serv.get("iid") == iid:
+                return serv
+        return None
+
+    def get_char(serv, iid):
+        try:
+            type_name = CharacteristicsTypes[iid]
+            type_uuid = CharacteristicsTypes.get_uuid(type_name)
+            for char in serv.get("characteristics"):
+                if char.get("type") == type_uuid:
+                    return char
+        except KeyError:
+            return None
+        return None
+
+    @callback
+    def async_add_service(aid, service):
+        if service["stype"] != "humidifier-dehumidifier":
+            return False
+        info = {"aid": aid, "iid": service["iid"]}
+
+        acc = get_accessory(conn, aid)
+        serv = get_service(acc, service["iid"])
+
+        if (
+            get_char(serv, CharacteristicsTypes.RELATIVE_HUMIDITY_HUMIDIFIER_THRESHOLD)
+            is not None
+        ):
+            async_add_entities([HomeKitHumidifier(conn, info)], True)
+
+        if (
+            get_char(
+                serv, CharacteristicsTypes.RELATIVE_HUMIDITY_DEHUMIDIFIER_THRESHOLD
+            )
+            is not None
+        ):
+            async_add_entities([HomeKitDehumidifier(conn, info)], True)
+
+        return True
+
+    conn.add_listener(async_add_service)
diff --git a/tests/components/homekit_controller/test_humidifier.py b/tests/components/homekit_controller/test_humidifier.py
new file mode 100644
index 00000000000..0af795e2ce9
--- /dev/null
+++ b/tests/components/homekit_controller/test_humidifier.py
@@ -0,0 +1,333 @@
+"""Basic checks for HomeKit Humidifier/Dehumidifier."""
+from aiohomekit.model.characteristics import CharacteristicsTypes
+from aiohomekit.model.services import ServicesTypes
+
+from homeassistant.components.humidifier import DOMAIN
+from homeassistant.components.humidifier.const import MODE_AUTO, MODE_NORMAL
+
+from tests.components.homekit_controller.common import setup_test_component
+
+ACTIVE = ("humidifier-dehumidifier", "active")
+CURRENT_HUMIDIFIER_DEHUMIDIFIER_STATE = (
+    "humidifier-dehumidifier",
+    "humidifier-dehumidifier.state.current",
+)
+TARGET_HUMIDIFIER_DEHUMIDIFIER_STATE = (
+    "humidifier-dehumidifier",
+    "humidifier-dehumidifier.state.target",
+)
+RELATIVE_HUMIDITY_CURRENT = ("humidifier-dehumidifier", "relative-humidity.current")
+RELATIVE_HUMIDITY_HUMIDIFIER_THRESHOLD = (
+    "humidifier-dehumidifier",
+    "relative-humidity.humidifier-threshold",
+)
+RELATIVE_HUMIDITY_DEHUMIDIFIER_THRESHOLD = (
+    "humidifier-dehumidifier",
+    "relative-humidity.dehumidifier-threshold",
+)
+
+
+def create_humidifier_service(accessory):
+    """Define a humidifier characteristics as per page 219 of HAP spec."""
+    service = accessory.add_service(ServicesTypes.HUMIDIFIER_DEHUMIDIFIER)
+
+    service.add_char(CharacteristicsTypes.ACTIVE, value=False)
+
+    cur_state = service.add_char(CharacteristicsTypes.RELATIVE_HUMIDITY_CURRENT)
+    cur_state.value = 0
+
+    cur_state = service.add_char(
+        CharacteristicsTypes.CURRENT_HUMIDIFIER_DEHUMIDIFIER_STATE
+    )
+    cur_state.value = -1
+
+    targ_state = service.add_char(
+        CharacteristicsTypes.TARGET_HUMIDIFIER_DEHUMIDIFIER_STATE
+    )
+    targ_state.value = 0
+
+    cur_state = service.add_char(
+        CharacteristicsTypes.RELATIVE_HUMIDITY_HUMIDIFIER_THRESHOLD
+    )
+    cur_state.value = 0
+
+    return service
+
+
+def create_dehumidifier_service(accessory):
+    """Define a dehumidifier characteristics as per page 219 of HAP spec."""
+    service = accessory.add_service(ServicesTypes.HUMIDIFIER_DEHUMIDIFIER)
+
+    service.add_char(CharacteristicsTypes.ACTIVE, value=False)
+
+    cur_state = service.add_char(CharacteristicsTypes.RELATIVE_HUMIDITY_CURRENT)
+    cur_state.value = 0
+
+    cur_state = service.add_char(
+        CharacteristicsTypes.CURRENT_HUMIDIFIER_DEHUMIDIFIER_STATE
+    )
+    cur_state.value = -1
+
+    targ_state = service.add_char(
+        CharacteristicsTypes.TARGET_HUMIDIFIER_DEHUMIDIFIER_STATE
+    )
+    targ_state.value = 0
+
+    targ_state = service.add_char(
+        CharacteristicsTypes.RELATIVE_HUMIDITY_DEHUMIDIFIER_THRESHOLD
+    )
+    targ_state.value = 0
+
+    return service
+
+
+async def test_humidifier_active_state(hass, utcnow):
+    """Test that we can turn a HomeKit humidifier on and off again."""
+    helper = await setup_test_component(hass, create_humidifier_service)
+
+    await hass.services.async_call(
+        DOMAIN, "turn_on", {"entity_id": helper.entity_id}, blocking=True
+    )
+
+    assert helper.characteristics[ACTIVE].value == 1
+
+    await hass.services.async_call(
+        DOMAIN, "turn_off", {"entity_id": helper.entity_id}, blocking=True
+    )
+
+    assert helper.characteristics[ACTIVE].value == 0
+
+
+async def test_dehumidifier_active_state(hass, utcnow):
+    """Test that we can turn a HomeKit dehumidifier on and off again."""
+    helper = await setup_test_component(hass, create_dehumidifier_service)
+
+    await hass.services.async_call(
+        DOMAIN, "turn_on", {"entity_id": helper.entity_id}, blocking=True
+    )
+
+    assert helper.characteristics[ACTIVE].value == 1
+
+    await hass.services.async_call(
+        DOMAIN, "turn_off", {"entity_id": helper.entity_id}, blocking=True
+    )
+
+    assert helper.characteristics[ACTIVE].value == 0
+
+
+async def test_humidifier_read_humidity(hass, utcnow):
+    """Test that we can read the state of a HomeKit humidifier accessory."""
+    helper = await setup_test_component(hass, create_humidifier_service)
+
+    helper.characteristics[ACTIVE].value = True
+    helper.characteristics[RELATIVE_HUMIDITY_HUMIDIFIER_THRESHOLD].value = 75
+    state = await helper.poll_and_get_state()
+    assert state.state == "on"
+    assert state.attributes["humidity"] == 75
+
+    helper.characteristics[ACTIVE].value = False
+    helper.characteristics[RELATIVE_HUMIDITY_HUMIDIFIER_THRESHOLD].value = 10
+    state = await helper.poll_and_get_state()
+    assert state.state == "off"
+    assert state.attributes["humidity"] == 10
+
+    helper.characteristics[CURRENT_HUMIDIFIER_DEHUMIDIFIER_STATE].value = 3
+    state = await helper.poll_and_get_state()
+    assert state.attributes["humidity"] == 10
+
+
+async def test_dehumidifier_read_humidity(hass, utcnow):
+    """Test that we can read the state of a HomeKit dehumidifier accessory."""
+    helper = await setup_test_component(hass, create_dehumidifier_service)
+
+    helper.characteristics[ACTIVE].value = True
+    helper.characteristics[RELATIVE_HUMIDITY_DEHUMIDIFIER_THRESHOLD].value = 75
+    state = await helper.poll_and_get_state()
+    assert state.state == "on"
+    assert state.attributes["humidity"] == 75
+
+    helper.characteristics[ACTIVE].value = False
+    helper.characteristics[RELATIVE_HUMIDITY_DEHUMIDIFIER_THRESHOLD].value = 40
+    state = await helper.poll_and_get_state()
+    assert state.state == "off"
+    assert state.attributes["humidity"] == 40
+
+    helper.characteristics[CURRENT_HUMIDIFIER_DEHUMIDIFIER_STATE].value = 2
+    state = await helper.poll_and_get_state()
+    assert state.attributes["humidity"] == 40
+
+
+async def test_humidifier_set_humidity(hass, utcnow):
+    """Test that we can set the state of a HomeKit humidifier accessory."""
+    helper = await setup_test_component(hass, create_humidifier_service)
+
+    await hass.services.async_call(
+        DOMAIN,
+        "set_humidity",
+        {"entity_id": helper.entity_id, "humidity": 20},
+        blocking=True,
+    )
+    assert helper.characteristics[RELATIVE_HUMIDITY_HUMIDIFIER_THRESHOLD].value == 20
+
+
+async def test_dehumidifier_set_humidity(hass, utcnow):
+    """Test that we can set the state of a HomeKit dehumidifier accessory."""
+    helper = await setup_test_component(hass, create_dehumidifier_service)
+
+    await hass.services.async_call(
+        DOMAIN,
+        "set_humidity",
+        {"entity_id": helper.entity_id, "humidity": 20},
+        blocking=True,
+    )
+    assert helper.characteristics[RELATIVE_HUMIDITY_DEHUMIDIFIER_THRESHOLD].value == 20
+
+
+async def test_humidifier_set_mode(hass, utcnow):
+    """Test that we can set the mode of a HomeKit humidifier accessory."""
+    helper = await setup_test_component(hass, create_humidifier_service)
+
+    await hass.services.async_call(
+        DOMAIN,
+        "set_mode",
+        {"entity_id": helper.entity_id, "mode": MODE_AUTO},
+        blocking=True,
+    )
+    assert helper.characteristics[TARGET_HUMIDIFIER_DEHUMIDIFIER_STATE].value == 0
+    assert helper.characteristics[ACTIVE].value == 1
+
+    await hass.services.async_call(
+        DOMAIN,
+        "set_mode",
+        {"entity_id": helper.entity_id, "mode": MODE_NORMAL},
+        blocking=True,
+    )
+    assert helper.characteristics[TARGET_HUMIDIFIER_DEHUMIDIFIER_STATE].value == 1
+    assert helper.characteristics[ACTIVE].value == 1
+
+
+async def test_dehumidifier_set_mode(hass, utcnow):
+    """Test that we can set the mode of a HomeKit dehumidifier accessory."""
+    helper = await setup_test_component(hass, create_dehumidifier_service)
+
+    await hass.services.async_call(
+        DOMAIN,
+        "set_mode",
+        {"entity_id": helper.entity_id, "mode": MODE_AUTO},
+        blocking=True,
+    )
+    assert helper.characteristics[TARGET_HUMIDIFIER_DEHUMIDIFIER_STATE].value == 0
+    assert helper.characteristics[ACTIVE].value == 1
+
+    await hass.services.async_call(
+        DOMAIN,
+        "set_mode",
+        {"entity_id": helper.entity_id, "mode": MODE_NORMAL},
+        blocking=True,
+    )
+    assert helper.characteristics[TARGET_HUMIDIFIER_DEHUMIDIFIER_STATE].value == 2
+    assert helper.characteristics[ACTIVE].value == 1
+
+
+async def test_humidifier_read_only_mode(hass, utcnow):
+    """Test that we can read the state of a HomeKit humidifier accessory."""
+    helper = await setup_test_component(hass, create_humidifier_service)
+
+    state = await helper.poll_and_get_state()
+    assert state.attributes["mode"] == "normal"
+
+    helper.characteristics[CURRENT_HUMIDIFIER_DEHUMIDIFIER_STATE].value = 0
+    state = await helper.poll_and_get_state()
+    assert state.attributes["mode"] == "normal"
+
+    helper.characteristics[CURRENT_HUMIDIFIER_DEHUMIDIFIER_STATE].value = 1
+    state = await helper.poll_and_get_state()
+    assert state.attributes["mode"] == "auto"
+
+    helper.characteristics[CURRENT_HUMIDIFIER_DEHUMIDIFIER_STATE].value = 2
+    state = await helper.poll_and_get_state()
+    assert state.attributes["mode"] == "normal"
+
+    helper.characteristics[CURRENT_HUMIDIFIER_DEHUMIDIFIER_STATE].value = 3
+    state = await helper.poll_and_get_state()
+    assert state.attributes["mode"] == "normal"
+
+
+async def test_dehumidifier_read_only_mode(hass, utcnow):
+    """Test that we can read the state of a HomeKit dehumidifier accessory."""
+    helper = await setup_test_component(hass, create_dehumidifier_service)
+
+    state = await helper.poll_and_get_state()
+    assert state.attributes["mode"] == "normal"
+
+    helper.characteristics[CURRENT_HUMIDIFIER_DEHUMIDIFIER_STATE].value = 0
+    state = await helper.poll_and_get_state()
+    assert state.attributes["mode"] == "normal"
+
+    helper.characteristics[CURRENT_HUMIDIFIER_DEHUMIDIFIER_STATE].value = 1
+    state = await helper.poll_and_get_state()
+    assert state.attributes["mode"] == "auto"
+
+    helper.characteristics[CURRENT_HUMIDIFIER_DEHUMIDIFIER_STATE].value = 2
+    state = await helper.poll_and_get_state()
+    assert state.attributes["mode"] == "normal"
+
+    helper.characteristics[CURRENT_HUMIDIFIER_DEHUMIDIFIER_STATE].value = 3
+    state = await helper.poll_and_get_state()
+    assert state.attributes["mode"] == "normal"
+
+
+async def test_humidifier_target_humidity_modes(hass, utcnow):
+    """Test that we can read the state of a HomeKit humidifier accessory."""
+    helper = await setup_test_component(hass, create_humidifier_service)
+
+    helper.characteristics[RELATIVE_HUMIDITY_HUMIDIFIER_THRESHOLD].value = 37
+    helper.characteristics[RELATIVE_HUMIDITY_CURRENT].value = 51
+    helper.characteristics[CURRENT_HUMIDIFIER_DEHUMIDIFIER_STATE].value = 1
+
+    state = await helper.poll_and_get_state()
+    assert state.attributes["mode"] == "auto"
+    assert state.attributes["humidity"] == 37
+
+    helper.characteristics[CURRENT_HUMIDIFIER_DEHUMIDIFIER_STATE].value = 3
+    state = await helper.poll_and_get_state()
+    assert state.attributes["mode"] == "normal"
+    assert state.attributes["humidity"] == 37
+
+    helper.characteristics[CURRENT_HUMIDIFIER_DEHUMIDIFIER_STATE].value = 2
+    state = await helper.poll_and_get_state()
+    assert state.attributes["mode"] == "normal"
+    assert state.attributes["humidity"] == 37
+
+    helper.characteristics[CURRENT_HUMIDIFIER_DEHUMIDIFIER_STATE].value = 0
+    state = await helper.poll_and_get_state()
+    assert state.attributes["mode"] == "normal"
+    assert state.attributes["humidity"] == 37
+
+
+async def test_dehumidifier_target_humidity_modes(hass, utcnow):
+    """Test that we can read the state of a HomeKit dehumidifier accessory."""
+    helper = await setup_test_component(hass, create_dehumidifier_service)
+
+    helper.characteristics[RELATIVE_HUMIDITY_DEHUMIDIFIER_THRESHOLD].value = 73
+    helper.characteristics[RELATIVE_HUMIDITY_CURRENT].value = 51
+    helper.characteristics[CURRENT_HUMIDIFIER_DEHUMIDIFIER_STATE].value = 1
+
+    state = await helper.poll_and_get_state()
+    assert state.attributes["mode"] == "auto"
+    assert state.attributes["humidity"] == 73
+
+    helper.characteristics[CURRENT_HUMIDIFIER_DEHUMIDIFIER_STATE].value = 3
+    state = await helper.poll_and_get_state()
+    assert state.attributes["mode"] == "normal"
+    assert state.attributes["humidity"] == 73
+
+    helper.characteristics[CURRENT_HUMIDIFIER_DEHUMIDIFIER_STATE].value = 2
+    state = await helper.poll_and_get_state()
+    assert state.attributes["mode"] == "normal"
+    assert state.attributes["humidity"] == 73
+
+    helper.characteristics[CURRENT_HUMIDIFIER_DEHUMIDIFIER_STATE].value = 0
+    state = await helper.poll_and_get_state()
+    assert state.attributes["mode"] == "normal"
+    assert state.attributes["humidity"] == 73