diff --git a/.strict-typing b/.strict-typing
index 4a4151ce606..f49e576a774 100644
--- a/.strict-typing
+++ b/.strict-typing
@@ -88,6 +88,7 @@ homeassistant.components.camera.*
 homeassistant.components.canary.*
 homeassistant.components.clickatell.*
 homeassistant.components.clicksend.*
+homeassistant.components.climate.*
 homeassistant.components.cloud.*
 homeassistant.components.configurator.*
 homeassistant.components.cover.*
diff --git a/homeassistant/components/climate/__init__.py b/homeassistant/components/climate/__init__.py
index 907ff84491b..dfc428a9bd0 100644
--- a/homeassistant/components/climate/__init__.py
+++ b/homeassistant/components/climate/__init__.py
@@ -242,8 +242,9 @@ class ClimateEntity(Entity):
         hvac_mode = self.hvac_mode
         if hvac_mode is None:
             return None
+        # Support hvac_mode as string for custom integration backwards compatibility
         if not isinstance(hvac_mode, HVACMode):
-            return HVACMode(hvac_mode).value
+            return HVACMode(hvac_mode).value  # type: ignore[unreachable]
         return hvac_mode.value
 
     @property
@@ -458,11 +459,11 @@ class ClimateEntity(Entity):
         """
         return self._attr_swing_modes
 
-    def set_temperature(self, **kwargs) -> None:
+    def set_temperature(self, **kwargs: Any) -> None:
         """Set new target temperature."""
         raise NotImplementedError()
 
-    async def async_set_temperature(self, **kwargs) -> None:
+    async def async_set_temperature(self, **kwargs: Any) -> None:
         """Set new target temperature."""
         await self.hass.async_add_executor_job(
             ft.partial(self.set_temperature, **kwargs)
diff --git a/homeassistant/components/climate/device_condition.py b/homeassistant/components/climate/device_condition.py
index d9f1b240a9a..57b9654651b 100644
--- a/homeassistant/components/climate/device_condition.py
+++ b/homeassistant/components/climate/device_condition.py
@@ -92,9 +92,9 @@ def async_condition_from_config(
             return False
 
         if config[CONF_TYPE] == "is_hvac_mode":
-            return state.state == config[const.ATTR_HVAC_MODE]
+            return bool(state.state == config[const.ATTR_HVAC_MODE])
 
-        return (
+        return bool(
             state.attributes.get(const.ATTR_PRESET_MODE)
             == config[const.ATTR_PRESET_MODE]
         )
diff --git a/homeassistant/components/climate/reproduce_state.py b/homeassistant/components/climate/reproduce_state.py
index 0bbc6fce7ec..2897a956fc6 100644
--- a/homeassistant/components/climate/reproduce_state.py
+++ b/homeassistant/components/climate/reproduce_state.py
@@ -38,7 +38,9 @@ async def _async_reproduce_states(
 ) -> None:
     """Reproduce component states."""
 
-    async def call_service(service: str, keys: Iterable, data=None):
+    async def call_service(
+        service: str, keys: Iterable, data: dict[str, Any] | None = None
+    ) -> None:
         """Call service with set of attributes given."""
         data = data or {}
         data["entity_id"] = state.entity_id
diff --git a/mypy.ini b/mypy.ini
index 14eb6bba841..6303f2b2706 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -641,6 +641,16 @@ disallow_untyped_defs = true
 warn_return_any = true
 warn_unreachable = true
 
+[mypy-homeassistant.components.climate.*]
+check_untyped_defs = true
+disallow_incomplete_defs = true
+disallow_subclassing_any = true
+disallow_untyped_calls = true
+disallow_untyped_decorators = true
+disallow_untyped_defs = true
+warn_return_any = true
+warn_unreachable = true
+
 [mypy-homeassistant.components.cloud.*]
 check_untyped_defs = true
 disallow_incomplete_defs = true