diff --git a/homeassistant/components/mold_indicator/sensor.py b/homeassistant/components/mold_indicator/sensor.py
index 8b0230e80931e8..262d13ad3af2fd 100644
--- a/homeassistant/components/mold_indicator/sensor.py
+++ b/homeassistant/components/mold_indicator/sensor.py
@@ -22,6 +22,7 @@
     CONF_NAME,
     CONF_UNIQUE_ID,
     PERCENTAGE,
+    STATE_UNAVAILABLE,
     STATE_UNKNOWN,
     UnitOfTemperature,
 )
@@ -310,7 +311,7 @@ def _update_temp_sensor(state: State) -> float | None:
         _LOGGER.debug("Updating temp sensor with value %s", state.state)
 
         # Return an error if the sensor change its state to Unknown.
-        if state.state == STATE_UNKNOWN:
+        if state.state in (STATE_UNKNOWN, STATE_UNAVAILABLE):
             _LOGGER.error(
                 "Unable to parse temperature sensor %s with state: %s",
                 state.entity_id,
@@ -318,8 +319,6 @@ def _update_temp_sensor(state: State) -> float | None:
             )
             return None
 
-        unit = state.attributes.get(ATTR_UNIT_OF_MEASUREMENT)
-
         if (temp := util.convert(state.state, float)) is None:
             _LOGGER.error(
                 "Unable to parse temperature sensor %s with state: %s",
@@ -329,12 +328,10 @@ def _update_temp_sensor(state: State) -> float | None:
             return None
 
         # convert to celsius if necessary
-        if unit == UnitOfTemperature.FAHRENHEIT:
-            return TemperatureConverter.convert(
-                temp, UnitOfTemperature.FAHRENHEIT, UnitOfTemperature.CELSIUS
-            )
-        if unit == UnitOfTemperature.CELSIUS:
-            return temp
+        if (
+            unit := state.attributes.get(ATTR_UNIT_OF_MEASUREMENT)
+        ) in UnitOfTemperature:
+            return TemperatureConverter.convert(temp, unit, UnitOfTemperature.CELSIUS)
         _LOGGER.error(
             "Temp sensor %s has unsupported unit: %s (allowed: %s, %s)",
             state.entity_id,
@@ -351,7 +348,7 @@ def _update_hum_sensor(state: State) -> float | None:
         _LOGGER.debug("Updating humidity sensor with value %s", state.state)
 
         # Return an error if the sensor change its state to Unknown.
-        if state.state == STATE_UNKNOWN:
+        if state.state in (STATE_UNKNOWN, STATE_UNAVAILABLE):
             _LOGGER.error(
                 "Unable to parse humidity sensor %s, state: %s",
                 state.entity_id,
@@ -369,19 +366,18 @@ def _update_hum_sensor(state: State) -> float | None:
 
         if (unit := state.attributes.get(ATTR_UNIT_OF_MEASUREMENT)) != PERCENTAGE:
             _LOGGER.error(
-                "Humidity sensor %s has unsupported unit: %s %s",
+                "Humidity sensor %s has unsupported unit: %s (allowed: %s)",
                 state.entity_id,
                 unit,
-                " (allowed: %)",
+                PERCENTAGE,
             )
             return None
 
         if hum > 100 or hum < 0:
             _LOGGER.error(
-                "Humidity sensor %s is out of range: %s %s",
+                "Humidity sensor %s is out of range: %s (allowed: 0-100)",
                 state.entity_id,
                 hum,
-                "(allowed: 0-100%)",
             )
             return None