diff --git a/homeassistant/components/fujitsu_fglair/coordinator.py b/homeassistant/components/fujitsu_fglair/coordinator.py
index eac3cfd6ce5..d98464e4751 100644
--- a/homeassistant/components/fujitsu_fglair/coordinator.py
+++ b/homeassistant/components/fujitsu_fglair/coordinator.py
@@ -48,10 +48,16 @@ class FGLairCoordinator(DataUpdateCoordinator[dict[str, FujitsuHVAC]]):
             raise ConfigEntryAuthFailed("Credentials expired for Ayla IoT API") from e
 
         if not listening_entities:
-            devices = [dev for dev in devices if isinstance(dev, FujitsuHVAC)]
+            devices = [
+                dev
+                for dev in devices
+                if isinstance(dev, FujitsuHVAC) and dev.is_online()
+            ]
         else:
             devices = [
-                dev for dev in devices if dev.device_serial_number in listening_entities
+                dev
+                for dev in devices
+                if dev.device_serial_number in listening_entities and dev.is_online()
             ]
 
         try:
diff --git a/homeassistant/components/fujitsu_fglair/entity.py b/homeassistant/components/fujitsu_fglair/entity.py
index 54d33d0e463..5c41a8ab18e 100644
--- a/homeassistant/components/fujitsu_fglair/entity.py
+++ b/homeassistant/components/fujitsu_fglair/entity.py
@@ -27,6 +27,11 @@ class FGLairEntity(CoordinatorEntity[FGLairCoordinator]):
             sw_version=device.property_values["mcu_firmware_version"],
         )
 
+    @property
+    def available(self) -> bool:
+        """Return if entity is available."""
+        return super().available and self.coordinator_context in self.coordinator.data
+
     @property
     def device(self) -> FujitsuHVAC:
         """Return the device object from the coordinator data."""
diff --git a/tests/components/fujitsu_fglair/test_init.py b/tests/components/fujitsu_fglair/test_init.py
index d400d85c33a..a69610c416d 100644
--- a/tests/components/fujitsu_fglair/test_init.py
+++ b/tests/components/fujitsu_fglair/test_init.py
@@ -7,6 +7,7 @@ from ayla_iot_unofficial.fujitsu_consts import FGLAIR_APP_CREDENTIALS
 from freezegun.api import FrozenDateTimeFactory
 import pytest
 
+from homeassistant.components.climate import HVACMode
 from homeassistant.components.fujitsu_fglair.const import (
     API_REFRESH,
     API_TIMEOUT,
@@ -124,6 +125,26 @@ async def test_device_auth_failure(
     assert hass.states.get(entity_id(mock_devices[1])).state == STATE_UNAVAILABLE
 
 
+async def test_device_offline(
+    hass: HomeAssistant,
+    freezer: FrozenDateTimeFactory,
+    mock_ayla_api: AsyncMock,
+    mock_config_entry: MockConfigEntry,
+    mock_devices: list[AsyncMock],
+) -> None:
+    """Test entities become unavailable if device if offline."""
+    await setup_integration(hass, mock_config_entry)
+
+    mock_ayla_api.async_get_devices.return_value[0].is_online.return_value = False
+
+    freezer.tick(API_REFRESH)
+    async_fire_time_changed(hass)
+    await hass.async_block_till_done()
+
+    assert hass.states.get(entity_id(mock_devices[0])).state == STATE_UNAVAILABLE
+    assert hass.states.get(entity_id(mock_devices[1])).state == HVACMode.COOL
+
+
 async def test_token_expired(
     hass: HomeAssistant,
     mock_ayla_api: AsyncMock,