diff --git a/homeassistant/components/actron_air/climate.py b/homeassistant/components/actron_air/climate.py
index efa75212773..8d2e6811594 100644
--- a/homeassistant/components/actron_air/climate.py
+++ b/homeassistant/components/actron_air/climate.py
@@ -38,6 +38,7 @@ HVAC_MODE_MAPPING_ACTRONAIR_TO_HA = {
     "HEAT": HVACMode.HEAT,
     "FAN": HVACMode.FAN_ONLY,
     "AUTO": HVACMode.AUTO,
+    "DRY": HVACMode.DRY,
     "OFF": HVACMode.OFF,
 }
 HVAC_MODE_MAPPING_HA_TO_ACTRONAIR = {
@@ -79,7 +80,6 @@ class ActronAirClimateEntity(ClimateEntity):
     )
     _attr_name = None
     _attr_fan_modes = list(FAN_MODE_MAPPING_ACTRONAIR_TO_HA.values())
-    _attr_hvac_modes = list(HVAC_MODE_MAPPING_ACTRONAIR_TO_HA.values())
 
 
 class ActronSystemClimate(ActronAirAcEntity, ActronAirClimateEntity):
@@ -93,6 +93,17 @@ class ActronSystemClimate(ActronAirAcEntity, ActronAirClimateEntity):
         super().__init__(coordinator)
         self._attr_unique_id = self._serial_number
 
+    @property
+    def hvac_modes(self) -> list[HVACMode]:
+        """Return the list of supported HVAC modes."""
+        modes = [
+            HVAC_MODE_MAPPING_ACTRONAIR_TO_HA[mode]
+            for mode in self._status.user_aircon_settings.supported_modes
+            if mode in HVAC_MODE_MAPPING_ACTRONAIR_TO_HA
+        ]
+        modes.append(HVACMode.OFF)
+        return modes
+
     @property
     def min_temp(self) -> float:
         """Return the minimum temperature that can be set."""
@@ -179,6 +190,18 @@ class ActronZoneClimate(ActronAirZoneEntity, ActronAirClimateEntity):
         super().__init__(coordinator, zone)
         self._attr_unique_id: str = self._zone_identifier
 
+    @property
+    def hvac_modes(self) -> list[HVACMode]:
+        """Return the list of supported HVAC modes."""
+        status = self.coordinator.data
+        modes = [
+            HVAC_MODE_MAPPING_ACTRONAIR_TO_HA[mode]
+            for mode in status.user_aircon_settings.supported_modes
+            if mode in HVAC_MODE_MAPPING_ACTRONAIR_TO_HA
+        ]
+        modes.append(HVACMode.OFF)
+        return modes
+
     @property
     def min_temp(self) -> float:
         """Return the minimum temperature that can be set."""
diff --git a/tests/components/actron_air/test_climate.py b/tests/components/actron_air/test_climate.py
index 292513e03bd..5ac2b84c12d 100644
--- a/tests/components/actron_air/test_climate.py
+++ b/tests/components/actron_air/test_climate.py
@@ -3,6 +3,7 @@
 from unittest.mock import MagicMock, patch
 
 from actron_neo_api import ActronAirAPIError
+from actron_neo_api.models.settings import ActronAirModeSupport
 import pytest
 from syrupy.assertion import SnapshotAssertion
 
@@ -362,3 +363,122 @@ async def test_zone_hvac_mode_inactive(
 
     state = hass.states.get("climate.living_room")
     assert state.state == "off"
+
+
+async def test_system_hvac_modes_default(
+    hass: HomeAssistant,
+    mock_actron_api: MagicMock,
+    mock_config_entry: MockConfigEntry,
+) -> None:
+    """Test system reports correct HVAC modes when DRY is not supported."""
+    with patch("homeassistant.components.actron_air.PLATFORMS", [Platform.CLIMATE]):
+        await setup_integration(hass, mock_config_entry)
+
+    state = hass.states.get("climate.test_system")
+    assert state.attributes["hvac_modes"] == [
+        HVACMode.COOL,
+        HVACMode.HEAT,
+        HVACMode.FAN_ONLY,
+        HVACMode.AUTO,
+        HVACMode.OFF,
+    ]
+
+
+async def test_system_hvac_modes_with_dry(
+    hass: HomeAssistant,
+    mock_actron_api: MagicMock,
+    mock_config_entry: MockConfigEntry,
+) -> None:
+    """Test system reports DRY HVAC mode when hardware supports it."""
+
+    status = mock_actron_api.state_manager.get_status.return_value
+    status.user_aircon_settings.mode_support = ActronAirModeSupport(
+        Cool=True, Heat=True, Fan=True, Auto=True, Dry=True
+    )
+
+    with patch("homeassistant.components.actron_air.PLATFORMS", [Platform.CLIMATE]):
+        await setup_integration(hass, mock_config_entry)
+
+    state = hass.states.get("climate.test_system")
+    assert state.attributes["hvac_modes"] == [
+        HVACMode.COOL,
+        HVACMode.HEAT,
+        HVACMode.FAN_ONLY,
+        HVACMode.AUTO,
+        HVACMode.DRY,
+        HVACMode.OFF,
+    ]
+
+
+async def test_system_hvac_modes_no_mode_support(
+    hass: HomeAssistant,
+    mock_actron_api: MagicMock,
+    mock_config_entry: MockConfigEntry,
+) -> None:
+    """Test system falls back to default modes when ModeSupport is absent."""
+    status = mock_actron_api.state_manager.get_status.return_value
+    status.user_aircon_settings.mode_support = None
+
+    with patch("homeassistant.components.actron_air.PLATFORMS", [Platform.CLIMATE]):
+        await setup_integration(hass, mock_config_entry)
+
+    state = hass.states.get("climate.test_system")
+    assert state.attributes["hvac_modes"] == [
+        HVACMode.COOL,
+        HVACMode.HEAT,
+        HVACMode.FAN_ONLY,
+        HVACMode.AUTO,
+        HVACMode.OFF,
+    ]
+
+
+async def test_zone_hvac_modes_with_dry(
+    hass: HomeAssistant,
+    mock_actron_api: MagicMock,
+    mock_config_entry: MockConfigEntry,
+    mock_zone: MagicMock,
+) -> None:
+    """Test zone reports DRY HVAC mode when hardware supports it."""
+
+    status = mock_actron_api.state_manager.get_status.return_value
+    status.user_aircon_settings.mode_support = ActronAirModeSupport(
+        Cool=True, Heat=True, Fan=True, Auto=True, Dry=True
+    )
+    status.remote_zone_info = [mock_zone]
+
+    with patch("homeassistant.components.actron_air.PLATFORMS", [Platform.CLIMATE]):
+        await setup_integration(hass, mock_config_entry)
+
+    state = hass.states.get("climate.living_room")
+    assert state.attributes["hvac_modes"] == [
+        HVACMode.COOL,
+        HVACMode.HEAT,
+        HVACMode.FAN_ONLY,
+        HVACMode.AUTO,
+        HVACMode.DRY,
+        HVACMode.OFF,
+    ]
+
+
+async def test_zone_hvac_modes_no_mode_support(
+    hass: HomeAssistant,
+    mock_actron_api: MagicMock,
+    mock_config_entry: MockConfigEntry,
+    mock_zone: MagicMock,
+) -> None:
+    """Test zone falls back to default modes when ModeSupport is absent."""
+    status = mock_actron_api.state_manager.get_status.return_value
+    status.user_aircon_settings.mode_support = None
+    status.remote_zone_info = [mock_zone]
+
+    with patch("homeassistant.components.actron_air.PLATFORMS", [Platform.CLIMATE]):
+        await setup_integration(hass, mock_config_entry)
+
+    state = hass.states.get("climate.living_room")
+    assert state.attributes["hvac_modes"] == [
+        HVACMode.COOL,
+        HVACMode.HEAT,
+        HVACMode.FAN_ONLY,
+        HVACMode.AUTO,
+        HVACMode.OFF,
+    ]