diff --git a/homeassistant/components/atag/climate.py b/homeassistant/components/atag/climate.py
index ce52bd4fd65..00897f127d9 100644
--- a/homeassistant/components/atag/climate.py
+++ b/homeassistant/components/atag/climate.py
@@ -15,6 +15,7 @@ from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import ATTR_TEMPERATURE, Platform
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
+from homeassistant.util.enum import try_parse_enum
 
 from . import DOMAIN, AtagEntity
 
@@ -52,11 +53,9 @@ class AtagThermostat(AtagEntity, ClimateEntity):
         self._attr_temperature_unit = coordinator.data.climate.temp_unit
 
     @property
-    def hvac_mode(self) -> str | None:
+    def hvac_mode(self) -> HVACMode | None:
         """Return hvac operation ie. heat, cool mode."""
-        if self.coordinator.data.climate.hvac_mode in HVAC_MODES:
-            return self.coordinator.data.climate.hvac_mode
-        return None
+        return try_parse_enum(HVACMode, self.coordinator.data.climate.hvac_mode)
 
     @property
     def hvac_action(self) -> str | None: