diff --git a/.strict-typing b/.strict-typing
index ff0ecd1c3ae..db69d828003 100644
--- a/.strict-typing
+++ b/.strict-typing
@@ -202,6 +202,7 @@ homeassistant.components.homekit_controller.utils
 homeassistant.components.homewizard.*
 homeassistant.components.http.*
 homeassistant.components.huawei_lte.*
+homeassistant.components.humidifier.*
 homeassistant.components.hydrawise.*
 homeassistant.components.hyperion.*
 homeassistant.components.ibeacon.*
diff --git a/homeassistant/components/humidifier/__init__.py b/homeassistant/components/humidifier/__init__.py
index 75d4f0fd225..ea6e8972cc6 100644
--- a/homeassistant/components/humidifier/__init__.py
+++ b/homeassistant/components/humidifier/__init__.py
@@ -91,7 +91,7 @@ __dir__ = partial(dir_with_deprecated_constants, module_globals=globals())
 
 
 @bind_hass
-def is_on(hass, entity_id):
+def is_on(hass: HomeAssistant, entity_id: str) -> bool:
     """Return if the humidifier is on based on the statemachine.
 
     Async friendly.
diff --git a/homeassistant/components/humidifier/reproduce_state.py b/homeassistant/components/humidifier/reproduce_state.py
index b0e9a29cacc..be4f1afbeb9 100644
--- a/homeassistant/components/humidifier/reproduce_state.py
+++ b/homeassistant/components/humidifier/reproduce_state.py
@@ -32,10 +32,9 @@ async def _async_reproduce_states(
         _LOGGER.warning("Unable to find entity %s", state.entity_id)
         return
 
-    async def call_service(service: str, keys: Iterable, data=None):
+    async def call_service(service: str, keys: Iterable[str]) -> None:
         """Call service with set of attributes given."""
-        data = data or {}
-        data["entity_id"] = state.entity_id
+        data = {"entity_id": state.entity_id}
         for key in keys:
             if key in state.attributes:
                 data[key] = state.attributes[key]
diff --git a/mypy.ini b/mypy.ini
index f1c2cfa2cf3..9ffbac47b25 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -1781,6 +1781,16 @@ disallow_untyped_defs = true
 warn_return_any = true
 warn_unreachable = true
 
+[mypy-homeassistant.components.humidifier.*]
+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.hydrawise.*]
 check_untyped_defs = true
 disallow_incomplete_defs = true