diff --git a/homeassistant/components/honeywell/__init__.py b/homeassistant/components/honeywell/__init__.py
index 485562f8b5d..4f3f27360f8 100644
--- a/homeassistant/components/honeywell/__init__.py
+++ b/homeassistant/components/honeywell/__init__.py
@@ -30,14 +30,13 @@ async def async_setup_entry(hass, config):
     loc_id = config.data.get(CONF_LOC_ID)
     dev_id = config.data.get(CONF_DEV_ID)
 
-    devices = []
+    devices = {}
 
     for location in client.locations_by_id.values():
-        for device in location.devices_by_id.values():
-            if (not loc_id or location.locationid == loc_id) and (
-                not dev_id or device.deviceid == dev_id
-            ):
-                devices.append(device)
+        if not loc_id or location.locationid == loc_id:
+            for device in location.devices_by_id.values():
+                if not dev_id or device.deviceid == dev_id:
+                    devices[device.deviceid] = device
 
     if len(devices) == 0:
         _LOGGER.debug("No devices found")
@@ -107,23 +106,30 @@ class HoneywellData:
         if self._client is None:
             return False
 
-        devices = [
+        refreshed_devices = [
             device
             for location in self._client.locations_by_id.values()
             for device in location.devices_by_id.values()
         ]
 
-        if len(devices) == 0:
-            _LOGGER.error("Failed to find any devices")
+        if len(refreshed_devices) == 0:
+            _LOGGER.error("Failed to find any devices after retry")
             return False
 
-        self.devices = devices
+        for updated_device in refreshed_devices:
+            if updated_device.deviceid in self.devices:
+                self.devices[updated_device.deviceid] = updated_device
+            else:
+                _LOGGER.info(
+                    "New device with ID %s detected, reload the honeywell integration if you want to access it in Home Assistant"
+                )
+
         await self._hass.config_entries.async_reload(self._config.entry_id)
         return True
 
     async def _refresh_devices(self):
         """Refresh each enabled device."""
-        for device in self.devices:
+        for device in self.devices.values():
             await self._hass.async_add_executor_job(device.refresh)
             await asyncio.sleep(UPDATE_LOOP_SLEEP_TIME)
 
@@ -143,11 +149,16 @@ class HoneywellData:
             ) as exp:
                 retries -= 1
                 if retries == 0:
+                    _LOGGER.error(
+                        "Ran out of retry attempts (3 attempts allocated). Error: %s",
+                        exp,
+                    )
                     raise exp
 
                 result = await self._retry()
 
                 if not result:
+                    _LOGGER.error("Retry result was empty. Error: %s", exp)
                     raise exp
 
-                _LOGGER.error("SomeComfort update failed, Retrying - Error: %s", exp)
+                _LOGGER.info("SomeComfort update failed, retrying. Error: %s", exp)
diff --git a/homeassistant/components/honeywell/climate.py b/homeassistant/components/honeywell/climate.py
index d2766515595..6c686e92b8e 100644
--- a/homeassistant/components/honeywell/climate.py
+++ b/homeassistant/components/honeywell/climate.py
@@ -122,7 +122,7 @@ async def async_setup_entry(hass, config, async_add_entities, discovery_info=Non
     async_add_entities(
         [
             HoneywellUSThermostat(data, device, cool_away_temp, heat_away_temp)
-            for device in data.devices
+            for device in data.devices.values()
         ]
     )
 
diff --git a/tests/components/honeywell/test_init.py b/tests/components/honeywell/test_init.py
index 619d770c59e..49917aae151 100644
--- a/tests/components/honeywell/test_init.py
+++ b/tests/components/honeywell/test_init.py
@@ -1,6 +1,8 @@
 """Test honeywell setup process."""
 
-from unittest.mock import patch
+from unittest.mock import create_autospec, patch
+
+import somecomfort
 
 from homeassistant.config_entries import ConfigEntryState
 from homeassistant.core import HomeAssistant
@@ -29,3 +31,20 @@ async def test_setup_multiple_thermostats(
     await hass.async_block_till_done()
     assert config_entry.state is ConfigEntryState.LOADED
     assert hass.states.async_entity_ids_count() == 2
+
+
+@patch("homeassistant.components.honeywell.UPDATE_LOOP_SLEEP_TIME", 0)
+async def test_setup_multiple_thermostats_with_same_deviceid(
+    hass: HomeAssistant, caplog, config_entry: MockConfigEntry, device, client
+) -> None:
+    """Test Honeywell TCC API returning duplicate device IDs."""
+    mock_location2 = create_autospec(somecomfort.Location, instance=True)
+    mock_location2.locationid.return_value = "location2"
+    mock_location2.devices_by_id = {device.deviceid: device}
+    client.locations_by_id["location2"] = mock_location2
+    config_entry.add_to_hass(hass)
+    await hass.config_entries.async_setup(config_entry.entry_id)
+    await hass.async_block_till_done()
+    assert config_entry.state is ConfigEntryState.LOADED
+    assert hass.states.async_entity_ids_count() == 1
+    assert "Platform honeywell does not generate unique IDs" not in caplog.text