Add zone temperature support to Daikin integration (#152642)

homeassistant/components/daikin/climate.py

@@ -2,9 +2,12 @@
 
 from __future__ import annotations
 
+from collections.abc import Sequence
 import logging
 from typing import Any
 
+from pydaikin.daikin_base import Appliance
+
 from homeassistant.components.climate import (
     ATTR_FAN_MODE,
     ATTR_HVAC_MODE,
@@ -21,6 +24,7 @@ from homeassistant.components.climate import (
 )
 from homeassistant.const import ATTR_TEMPERATURE, UnitOfTemperature
 from homeassistant.core import HomeAssistant
+from homeassistant.exceptions import HomeAssistantError, ServiceValidationError
 from homeassistant.helpers.entity_platform import AddConfigEntryEntitiesCallback
 
 from .const import (
@@ -29,12 +33,19 @@ from .const import (
     ATTR_STATE_OFF,
     ATTR_STATE_ON,
     ATTR_TARGET_TEMPERATURE,
+    DOMAIN,
+    ZONE_NAME_UNCONFIGURED,
 )
 from .coordinator import DaikinConfigEntry, DaikinCoordinator
 from .entity import DaikinEntity
 
 _LOGGER = logging.getLogger(__name__)
 
+type DaikinZone = Sequence[str | int]
+
+DAIKIN_ZONE_TEMP_HEAT = "lztemp_h"
+DAIKIN_ZONE_TEMP_COOL = "lztemp_c"
+
 
 HA_STATE_TO_DAIKIN = {
     HVACMode.FAN_ONLY: "fan",
@@ -78,6 +89,70 @@ HA_ATTR_TO_DAIKIN = {
 }
 
 DAIKIN_ATTR_ADVANCED = "adv"
+ZONE_TEMPERATURE_WINDOW = 2
+
+
+def _zone_error(
+    translation_key: str, placeholders: dict[str, str] | None = None
+) -> HomeAssistantError:
+    """Return a Home Assistant error with Daikin translation info."""
+    return HomeAssistantError(
+        translation_domain=DOMAIN,
+        translation_key=translation_key,
+        translation_placeholders=placeholders,
+    )
+
+
+def _zone_is_configured(zone: DaikinZone) -> bool:
+    """Return True if the Daikin zone represents a configured zone."""
+    if not zone:
+        return False
+    return zone[0] != ZONE_NAME_UNCONFIGURED
+
+
+def _zone_temperature_lists(device: Appliance) -> tuple[list[str], list[str]]:
+    """Return the decoded zone temperature lists."""
+    try:
+        heating = device.represent(DAIKIN_ZONE_TEMP_HEAT)[1]
+        cooling = device.represent(DAIKIN_ZONE_TEMP_COOL)[1]
+    except AttributeError:
+        return ([], [])
+    return (list(heating or []), list(cooling or []))
+
+
+def _supports_zone_temperature_control(device: Appliance) -> bool:
+    """Return True if the device exposes zone temperature settings."""
+    zones = device.zones
+    if not zones:
+        return False
+    heating, cooling = _zone_temperature_lists(device)
+    return bool(
+        heating
+        and cooling
+        and len(heating) >= len(zones)
+        and len(cooling) >= len(zones)
+    )
+
+
+def _system_target_temperature(device: Appliance) -> float | None:
+    """Return the system target temperature when available."""
+    target = device.target_temperature
+    if target is None:
+        return None
+    try:
+        return float(target)
+    except TypeError, ValueError:
+        return None
+
+
+def _zone_temperature_from_list(values: list[str], zone_id: int) -> float | None:
+    """Return the parsed temperature for a zone from a Daikin list."""
+    if zone_id >= len(values):
+        return None
+    try:
+        return float(values[zone_id])
+    except TypeError, ValueError:
+        return None
 
 
 async def async_setup_entry(
@@ -86,8 +161,16 @@ async def async_setup_entry(
     async_add_entities: AddConfigEntryEntitiesCallback,
 ) -> None:
     """Set up Daikin climate based on config_entry."""
-    daikin_api = entry.runtime_data
-    async_add_entities([DaikinClimate(daikin_api)])
+    coordinator = entry.runtime_data
+    entities: list[ClimateEntity] = [DaikinClimate(coordinator)]
+    if _supports_zone_temperature_control(coordinator.device):
+        zones = coordinator.device.zones or []
+        entities.extend(
+            DaikinZoneClimate(coordinator, zone_id)
+            for zone_id, zone in enumerate(zones)
+            if _zone_is_configured(zone)
+        )
+    async_add_entities(entities)
 
 
 def format_target_temperature(target_temperature: float) -> str:
@@ -284,3 +367,130 @@ class DaikinClimate(DaikinEntity, ClimateEntity):
             {HA_ATTR_TO_DAIKIN[ATTR_HVAC_MODE]: HA_STATE_TO_DAIKIN[HVACMode.OFF]}
         )
         await self.coordinator.async_refresh()
+
+
+class DaikinZoneClimate(DaikinEntity, ClimateEntity):
+    """Representation of a Daikin zone temperature controller."""
+
+    _attr_temperature_unit = UnitOfTemperature.CELSIUS
+    _attr_has_entity_name = True
+    _attr_supported_features = ClimateEntityFeature.TARGET_TEMPERATURE
+    _attr_target_temperature_step = 1
+
+    def __init__(self, coordinator: DaikinCoordinator, zone_id: int) -> None:
+        """Initialize the zone climate entity."""
+        super().__init__(coordinator)
+        self._zone_id = zone_id
+        self._attr_unique_id = f"{self.device.mac}-zone{zone_id}-temperature"
+        zone_name = self.device.zones[self._zone_id][0]
+        self._attr_name = f"{zone_name} temperature"
+
+    @property
+    def hvac_modes(self) -> list[HVACMode]:
+        """Return the hvac modes (mirrors the main unit)."""
+        return [self.hvac_mode]
+
+    @property
+    def hvac_mode(self) -> HVACMode:
+        """Return the current HVAC mode."""
+        daikin_mode = self.device.represent(HA_ATTR_TO_DAIKIN[ATTR_HVAC_MODE])[1]
+        return DAIKIN_TO_HA_STATE.get(daikin_mode, HVACMode.HEAT_COOL)
+
+    @property
+    def hvac_action(self) -> HVACAction | None:
+        """Return the current HVAC action."""
+        return HA_STATE_TO_CURRENT_HVAC.get(self.hvac_mode)
+
+    @property
+    def target_temperature(self) -> float | None:
+        """Return the zone target temperature for the active mode."""
+        heating, cooling = _zone_temperature_lists(self.device)
+        mode = self.hvac_mode
+        if mode == HVACMode.HEAT:
+            return _zone_temperature_from_list(heating, self._zone_id)
+        if mode == HVACMode.COOL:
+            return _zone_temperature_from_list(cooling, self._zone_id)
+        return None
+
+    @property
+    def min_temp(self) -> float:
+        """Return the minimum selectable temperature."""
+        target = _system_target_temperature(self.device)
+        if target is None:
+            return super().min_temp
+        return target - ZONE_TEMPERATURE_WINDOW
+
+    @property
+    def max_temp(self) -> float:
+        """Return the maximum selectable temperature."""
+        target = _system_target_temperature(self.device)
+        if target is None:
+            return super().max_temp
+        return target + ZONE_TEMPERATURE_WINDOW
+
+    @property
+    def available(self) -> bool:
+        """Return if the entity is available."""
+        return (
+            super().available
+            and _supports_zone_temperature_control(self.device)
+            and _system_target_temperature(self.device) is not None
+        )
+
+    @property
+    def extra_state_attributes(self) -> dict[str, Any]:
+        """Return additional metadata."""
+        return {"zone_id": self._zone_id}
+
+    async def async_set_temperature(self, **kwargs: Any) -> None:
+        """Set the zone temperature."""
+        if (temperature := kwargs.get(ATTR_TEMPERATURE)) is None:
+            raise ServiceValidationError(
+                translation_domain=DOMAIN,
+                translation_key="zone_temperature_missing",
+            )
+        zones = self.device.zones
+        if not zones or not _supports_zone_temperature_control(self.device):
+            raise _zone_error("zone_parameters_unavailable")
+
+        try:
+            zone = zones[self._zone_id]
+        except (IndexError, TypeError) as err:
+            raise _zone_error(
+                "zone_missing",
+                {
+                    "zone_id": str(self._zone_id),
+                    "max_zone": str(len(zones) - 1),
+                },
+            ) from err
+
+        if not _zone_is_configured(zone):
+            raise _zone_error("zone_inactive", {"zone_id": str(self._zone_id)})
+
+        temperature_value = float(temperature)
+        target = _system_target_temperature(self.device)
+        if target is None:
+            raise _zone_error("zone_parameters_unavailable")
+
+        mode = self.hvac_mode
+        if mode == HVACMode.HEAT:
+            zone_key = DAIKIN_ZONE_TEMP_HEAT
+        elif mode == HVACMode.COOL:
+            zone_key = DAIKIN_ZONE_TEMP_COOL
+        else:
+            raise _zone_error("zone_hvac_mode_unsupported")
+
+        zone_value = str(round(temperature_value))
+        try:
+            await self.device.set_zone(self._zone_id, zone_key, zone_value)
+        except (AttributeError, KeyError, NotImplementedError, TypeError) as err:
+            raise _zone_error("zone_set_failed") from err
+
+        await self.coordinator.async_request_refresh()
+
+    async def async_set_hvac_mode(self, hvac_mode: HVACMode) -> None:
+        """Disallow changing HVAC mode via zone climate."""
+        raise HomeAssistantError(
+            translation_domain=DOMAIN,
+            translation_key="zone_hvac_read_only",
+        )

homeassistant/components/daikin/const.py

@@ -24,4 +24,6 @@ ATTR_STATE_OFF = "off"
 KEY_MAC = "mac"
 KEY_IP = "ip"
 
+ZONE_NAME_UNCONFIGURED = "-"
+
 TIMEOUT_SEC = 120

homeassistant/components/daikin/strings.json

@@ -57,5 +57,28 @@
         "name": "Power"
       }
     }
+  },
+  "exceptions": {
+    "zone_hvac_mode_unsupported": {
+      "message": "Zone temperature can only be changed when the main climate mode is heat or cool."
+    },
+    "zone_hvac_read_only": {
+      "message": "Zone HVAC mode is controlled by the main climate entity."
+    },
+    "zone_inactive": {
+      "message": "Zone {zone_id} is not active. Enable the zone on your Daikin device first."
+    },
+    "zone_missing": {
+      "message": "Zone {zone_id} does not exist. Available zones are 0-{max_zone}."
+    },
+    "zone_parameters_unavailable": {
+      "message": "This device does not expose the required zone temperature parameters."
+    },
+    "zone_set_failed": {
+      "message": "Failed to set zone temperature. The device may not support this operation."
+    },
+    "zone_temperature_missing": {
+      "message": "Provide a temperature value when adjusting a zone."
+    }
   }
 }

homeassistant/components/daikin/switch.py

@@ -8,6 +8,7 @@ from homeassistant.components.switch import SwitchEntity
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.entity_platform import AddConfigEntryEntitiesCallback
 
+from .const import ZONE_NAME_UNCONFIGURED
 from .coordinator import DaikinConfigEntry, DaikinCoordinator
 from .entity import DaikinEntity
 
@@ -28,7 +29,7 @@ async def async_setup_entry(
         switches.extend(
             DaikinZoneSwitch(daikin_api, zone_id)
             for zone_id, zone in enumerate(zones)
-            if zone[0] != "-"
+            if zone[0] != ZONE_NAME_UNCONFIGURED
         )
     if daikin_api.device.support_advanced_modes:
         # It isn't possible to find out from the API responses if a specific

tests/components/daikin/conftest.py

@@ -0,0 +1,109 @@
+"""Fixtures for Daikin tests."""
+
+from __future__ import annotations
+
+from collections.abc import Callable, Generator
+import re
+from typing import Any
+from unittest.mock import AsyncMock, MagicMock, patch
+import urllib.parse
+
+import pytest
+
+type ZoneDefinition = list[str | int]
+type ZoneDevice = MagicMock
+
+
+def _decode_zone_values(value: str) -> list[str]:
+    """Decode a semicolon separated list into zone values."""
+    return re.findall(r"[^;]+", urllib.parse.unquote(value))
+
+
+def configure_zone_device(
+    zone_device: ZoneDevice,
+    *,
+    zones: list[ZoneDefinition],
+    target_temperature: float | None = 22,
+    mode: str = "hot",
+    heating_values: str | None = None,
+    cooling_values: str | None = None,
+) -> None:
+    """Configure a mocked zone-capable Daikin device for a test."""
+    zone_device.target_temperature = target_temperature
+    zone_device.zones = zones
+    zone_device._mode = mode
+
+    encoded_zone_temperatures = ";".join(str(zone[2]) for zone in zones)
+    zone_device.values = {
+        "name": "Daikin Test",
+        "model": "TESTMODEL",
+        "ver": "1_0_0",
+        "zone_name": ";".join(str(zone[0]) for zone in zones),
+        "zone_onoff": ";".join(str(zone[1]) for zone in zones),
+        "lztemp_h": (
+            encoded_zone_temperatures if heating_values is None else heating_values
+        ),
+        "lztemp_c": (
+            encoded_zone_temperatures if cooling_values is None else cooling_values
+        ),
+    }
+
+
+@pytest.fixture
+def zone_device() -> Generator[ZoneDevice]:
+    """Return a mocked zone-capable Daikin device and patch its factory."""
+    device = MagicMock(name="DaikinZoneDevice")
+    device.mac = "001122334455"
+    device.fan_rate = []
+    device.swing_modes = []
+    device.support_away_mode = False
+    device.support_advanced_modes = False
+    device.support_fan_rate = False
+    device.support_swing_mode = False
+    device.support_outside_temperature = False
+    device.support_energy_consumption = False
+    device.support_humidity = False
+    device.support_compressor_frequency = False
+    device.compressor_frequency = 0
+    device.inside_temperature = 21.0
+    device.outside_temperature = 13.0
+    device.humidity = 40
+    device.current_total_power_consumption = 0.0
+    device.last_hour_cool_energy_consumption = 0.0
+    device.last_hour_heat_energy_consumption = 0.0
+    device.today_energy_consumption = 0.0
+    device.today_total_energy_consumption = 0.0
+
+    configure_zone_device(device, zones=[["Living", "1", 22]])
+
+    def _represent(key: str) -> tuple[None, list[str] | str]:
+        dynamic_values: dict[str, Callable[[], list[str] | str]] = {
+            "lztemp_h": lambda: _decode_zone_values(device.values["lztemp_h"]),
+            "lztemp_c": lambda: _decode_zone_values(device.values["lztemp_c"]),
+            "mode": lambda: device._mode,
+            "f_rate": lambda: "auto",
+            "f_dir": lambda: "3d",
+            "en_hol": lambda: "off",
+            "adv": lambda: "",
+            "htemp": lambda: str(device.inside_temperature),
+            "otemp": lambda: str(device.outside_temperature),
+        }
+        return (None, dynamic_values.get(key, lambda: "")())
+
+    async def _set(values: dict[str, Any]) -> None:
+        if mode := values.get("mode"):
+            device._mode = mode
+
+    device.represent = MagicMock(side_effect=_represent)
+    device.update_status = AsyncMock()
+    device.set = AsyncMock(side_effect=_set)
+    device.set_zone = AsyncMock()
+    device.set_holiday = AsyncMock()
+    device.set_advanced_mode = AsyncMock()
+    device.set_streamer = AsyncMock()
+
+    with patch(
+        "homeassistant.components.daikin.DaikinFactory",
+        new=AsyncMock(return_value=device),
+    ):
+        yield device

tests/components/daikin/test_zone_climate.py

@@ -0,0 +1,353 @@
+"""Tests for Daikin zone climate entities."""
+
+from __future__ import annotations
+
+from unittest.mock import AsyncMock
+
+import pytest
+
+from homeassistant.components.climate import (
+    ATTR_HVAC_ACTION,
+    ATTR_HVAC_MODE,
+    ATTR_HVAC_MODES,
+    ATTR_MAX_TEMP,
+    ATTR_MIN_TEMP,
+    DOMAIN as CLIMATE_DOMAIN,
+    SERVICE_SET_HVAC_MODE,
+    SERVICE_SET_TEMPERATURE,
+    HVACAction,
+    HVACMode,
+)
+from homeassistant.components.daikin.const import DOMAIN, KEY_MAC
+from homeassistant.const import (
+    ATTR_ENTITY_ID,
+    ATTR_TEMPERATURE,
+    CONF_HOST,
+    STATE_UNAVAILABLE,
+)
+from homeassistant.core import HomeAssistant
+from homeassistant.exceptions import HomeAssistantError, ServiceValidationError
+from homeassistant.helpers import entity_registry as er
+from homeassistant.helpers.entity_component import async_update_entity
+
+from .conftest import ZoneDevice, configure_zone_device
+
+from tests.common import MockConfigEntry
+
+HOST = "127.0.0.1"
+
+
+async def _async_setup_daikin(
+    hass: HomeAssistant, zone_device: ZoneDevice
+) -> MockConfigEntry:
+    """Set up a Daikin config entry with a mocked library device."""
+    config_entry = MockConfigEntry(
+        domain=DOMAIN,
+        unique_id=zone_device.mac,
+        data={CONF_HOST: HOST, KEY_MAC: zone_device.mac},
+    )
+    config_entry.add_to_hass(hass)
+
+    assert await hass.config_entries.async_setup(config_entry.entry_id)
+    await hass.async_block_till_done()
+
+    return config_entry
+
+
+def _zone_entity_id(
+    entity_registry: er.EntityRegistry, zone_device: ZoneDevice, zone_id: int
+) -> str | None:
+    """Return the entity id for a zone climate unique id."""
+    return entity_registry.async_get_entity_id(
+        CLIMATE_DOMAIN,
+        DOMAIN,
+        f"{zone_device.mac}-zone{zone_id}-temperature",
+    )
+
+
+async def _async_set_zone_temperature(
+    hass: HomeAssistant, entity_id: str, temperature: float
+) -> None:
+    """Call `climate.set_temperature` for a zone climate."""
+    await hass.services.async_call(
+        CLIMATE_DOMAIN,
+        SERVICE_SET_TEMPERATURE,
+        {
+            ATTR_ENTITY_ID: entity_id,
+            ATTR_TEMPERATURE: temperature,
+        },
+        blocking=True,
+    )
+
+
+async def test_setup_entry_adds_zone_climates(
+    hass: HomeAssistant,
+    entity_registry: er.EntityRegistry,
+    zone_device: ZoneDevice,
+) -> None:
+    """Configured zones create zone climate entities."""
+    configure_zone_device(
+        zone_device, zones=[["-", "0", 0], ["Living", "1", 22], ["Office", "1", 21]]
+    )
+
+    await _async_setup_daikin(hass, zone_device)
+
+    assert _zone_entity_id(entity_registry, zone_device, 0) is None
+    assert _zone_entity_id(entity_registry, zone_device, 1) is not None
+    assert _zone_entity_id(entity_registry, zone_device, 2) is not None
+
+
+async def test_setup_entry_skips_zone_climates_without_support(
+    hass: HomeAssistant,
+    entity_registry: er.EntityRegistry,
+    zone_device: ZoneDevice,
+) -> None:
+    """Missing zone temperature lists skip zone climate entities."""
+    configure_zone_device(zone_device, zones=[["Living", "1", 22]])
+    zone_device.values["lztemp_h"] = ""
+    zone_device.values["lztemp_c"] = ""
+
+    await _async_setup_daikin(hass, zone_device)
+
+    assert _zone_entity_id(entity_registry, zone_device, 0) is None
+
+
+@pytest.mark.parametrize(
+    ("mode", "expected_zone_key"),
+    [("hot", "lztemp_h"), ("cool", "lztemp_c")],
+)
+async def test_zone_climate_sets_temperature_for_active_mode(
+    hass: HomeAssistant,
+    entity_registry: er.EntityRegistry,
+    zone_device: ZoneDevice,
+    mode: str,
+    expected_zone_key: str,
+) -> None:
+    """Setting temperature updates the active mode zone value."""
+    configure_zone_device(
+        zone_device,
+        zones=[["Living", "1", 22], ["Office", "1", 21]],
+        mode=mode,
+    )
+    await _async_setup_daikin(hass, zone_device)
+    entity_id = _zone_entity_id(entity_registry, zone_device, 0)
+    assert entity_id is not None
+
+    await _async_set_zone_temperature(hass, entity_id, 23)
+
+    zone_device.set_zone.assert_awaited_once_with(0, expected_zone_key, "23")
+
+
+async def test_zone_climate_rejects_out_of_range_temperature(
+    hass: HomeAssistant,
+    entity_registry: er.EntityRegistry,
+    zone_device: ZoneDevice,
+) -> None:
+    """Service validation rejects values outside the allowed range."""
+    configure_zone_device(
+        zone_device,
+        zones=[["Living", "1", 22]],
+        target_temperature=22,
+    )
+    await _async_setup_daikin(hass, zone_device)
+    entity_id = _zone_entity_id(entity_registry, zone_device, 0)
+    assert entity_id is not None
+
+    with pytest.raises(ServiceValidationError) as err:
+        await _async_set_zone_temperature(hass, entity_id, 30)
+
+    assert err.value.translation_key == "temp_out_of_range"
+
+
+async def test_zone_climate_unavailable_without_target_temperature(
+    hass: HomeAssistant,
+    entity_registry: er.EntityRegistry,
+    zone_device: ZoneDevice,
+) -> None:
+    """Zones are unavailable if system target temperature is missing."""
+    configure_zone_device(
+        zone_device,
+        zones=[["Living", "1", 22]],
+        target_temperature=None,
+    )
+    await _async_setup_daikin(hass, zone_device)
+    entity_id = _zone_entity_id(entity_registry, zone_device, 0)
+    assert entity_id is not None
+
+    state = hass.states.get(entity_id)
+    assert state is not None
+    assert state.state == STATE_UNAVAILABLE
+
+
+async def test_zone_climate_zone_inactive_after_setup(
+    hass: HomeAssistant,
+    entity_registry: er.EntityRegistry,
+    zone_device: ZoneDevice,
+) -> None:
+    """Inactive zones raise a translated error during service calls."""
+    configure_zone_device(zone_device, zones=[["Living", "1", 22]])
+    await _async_setup_daikin(hass, zone_device)
+    entity_id = _zone_entity_id(entity_registry, zone_device, 0)
+    assert entity_id is not None
+    zone_device.zones[0][0] = "-"
+
+    with pytest.raises(HomeAssistantError) as err:
+        await _async_set_zone_temperature(hass, entity_id, 21)
+
+    assert err.value.translation_key == "zone_inactive"
+
+
+async def test_zone_climate_zone_missing_after_setup(
+    hass: HomeAssistant,
+    entity_registry: er.EntityRegistry,
+    zone_device: ZoneDevice,
+) -> None:
+    """Missing zones raise a translated error during service calls."""
+    configure_zone_device(
+        zone_device,
+        zones=[["Living", "1", 22], ["Office", "1", 22]],
+    )
+    await _async_setup_daikin(hass, zone_device)
+    entity_id = _zone_entity_id(entity_registry, zone_device, 1)
+    assert entity_id is not None
+    zone_device.zones = [["Living", "1", 22]]
+
+    with pytest.raises(HomeAssistantError) as err:
+        await _async_set_zone_temperature(hass, entity_id, 21)
+
+    assert err.value.translation_key == "zone_missing"
+
+
+async def test_zone_climate_parameters_unavailable(
+    hass: HomeAssistant,
+    entity_registry: er.EntityRegistry,
+    zone_device: ZoneDevice,
+) -> None:
+    """Missing zone parameter lists make the zone entity unavailable."""
+    configure_zone_device(zone_device, zones=[["Living", "1", 22]])
+    await _async_setup_daikin(hass, zone_device)
+    entity_id = _zone_entity_id(entity_registry, zone_device, 0)
+    assert entity_id is not None
+    zone_device.values["lztemp_h"] = ""
+    zone_device.values["lztemp_c"] = ""
+
+    await async_update_entity(hass, entity_id)
+    state = hass.states.get(entity_id)
+    assert state is not None
+    assert state.state == STATE_UNAVAILABLE
+
+
+async def test_zone_climate_hvac_modes_read_only(
+    hass: HomeAssistant,
+    entity_registry: er.EntityRegistry,
+    zone_device: ZoneDevice,
+) -> None:
+    """Changing HVAC mode through a zone climate is blocked."""
+    configure_zone_device(zone_device, zones=[["Living", "1", 22]])
+    await _async_setup_daikin(hass, zone_device)
+    entity_id = _zone_entity_id(entity_registry, zone_device, 0)
+    assert entity_id is not None
+
+    with pytest.raises(HomeAssistantError) as err:
+        await hass.services.async_call(
+            CLIMATE_DOMAIN,
+            SERVICE_SET_HVAC_MODE,
+            {
+                ATTR_ENTITY_ID: entity_id,
+                ATTR_HVAC_MODE: HVACMode.HEAT,
+            },
+            blocking=True,
+        )
+
+    assert err.value.translation_key == "zone_hvac_read_only"
+
+
+async def test_zone_climate_set_temperature_requires_heat_or_cool(
+    hass: HomeAssistant,
+    entity_registry: er.EntityRegistry,
+    zone_device: ZoneDevice,
+) -> None:
+    """Setting temperature in unsupported modes raises a translated error."""
+    configure_zone_device(
+        zone_device,
+        zones=[["Living", "1", 22]],
+        mode="auto",
+    )
+    await _async_setup_daikin(hass, zone_device)
+    entity_id = _zone_entity_id(entity_registry, zone_device, 0)
+    assert entity_id is not None
+
+    with pytest.raises(HomeAssistantError) as err:
+        await _async_set_zone_temperature(hass, entity_id, 21)
+
+    assert err.value.translation_key == "zone_hvac_mode_unsupported"
+
+
+async def test_zone_climate_properties(
+    hass: HomeAssistant,
+    entity_registry: er.EntityRegistry,
+    zone_device: ZoneDevice,
+) -> None:
+    """Zone climate exposes expected state attributes."""
+    configure_zone_device(
+        zone_device,
+        zones=[["Living", "1", 22]],
+        target_temperature=24,
+        mode="cool",
+        heating_values="20",
+        cooling_values="18",
+    )
+    await _async_setup_daikin(hass, zone_device)
+    entity_id = _zone_entity_id(entity_registry, zone_device, 0)
+    assert entity_id is not None
+
+    state = hass.states.get(entity_id)
+    assert state is not None
+    assert state.state == HVACMode.COOL
+    assert state.attributes[ATTR_HVAC_ACTION] == HVACAction.COOLING
+    assert state.attributes[ATTR_TEMPERATURE] == 18.0
+    assert state.attributes[ATTR_MIN_TEMP] == 22.0
+    assert state.attributes[ATTR_MAX_TEMP] == 26.0
+    assert state.attributes[ATTR_HVAC_MODES] == [HVACMode.COOL]
+    assert state.attributes["zone_id"] == 0
+
+
+async def test_zone_climate_target_temperature_inactive_mode(
+    hass: HomeAssistant,
+    entity_registry: er.EntityRegistry,
+    zone_device: ZoneDevice,
+) -> None:
+    """In non-heating/cooling modes, zone target temperature is None."""
+    configure_zone_device(
+        zone_device,
+        zones=[["Living", "1", 22]],
+        mode="auto",
+        heating_values="bad",
+        cooling_values="19",
+    )
+    await _async_setup_daikin(hass, zone_device)
+    entity_id = _zone_entity_id(entity_registry, zone_device, 0)
+    assert entity_id is not None
+
+    state = hass.states.get(entity_id)
+    assert state is not None
+    assert state.state == HVACMode.HEAT_COOL
+    assert state.attributes[ATTR_TEMPERATURE] is None
+
+
+async def test_zone_climate_set_zone_failed(
+    hass: HomeAssistant,
+    entity_registry: er.EntityRegistry,
+    zone_device: ZoneDevice,
+) -> None:
+    """Service call surfaces backend zone update errors."""
+    configure_zone_device(zone_device, zones=[["Living", "1", 22]])
+    await _async_setup_daikin(hass, zone_device)
+    entity_id = _zone_entity_id(entity_registry, zone_device, 0)
+    assert entity_id is not None
+    zone_device.set_zone = AsyncMock(side_effect=NotImplementedError)
+
+    with pytest.raises(HomeAssistantError) as err:
+        await _async_set_zone_temperature(hass, entity_id, 21)
+
+    assert err.value.translation_key == "zone_set_failed"