diff --git a/homeassistant/components/shelly/climate.py b/homeassistant/components/shelly/climate.py
index 810d662f75f..ffc66215678 100644
--- a/homeassistant/components/shelly/climate.py
+++ b/homeassistant/components/shelly/climate.py
@@ -145,9 +145,10 @@ class BlockSleepingClimate(
 
         if self.block is not None and self.device_block is not None:
             self._unique_id = f"{self.wrapper.mac}-{self.block.description}"
+            assert self.block.channel
             self._preset_modes = [
                 PRESET_NONE,
-                *wrapper.device.settings["thermostats"][cast(int, self.block.channel)][
+                *wrapper.device.settings["thermostats"][int(self.block.channel)][
                     "schedule_profile_names"
                 ],
             ]