diff --git a/homeassistant/components/homematic/climate.py b/homeassistant/components/homematic/climate.py
index 2b0306809b0..16c345c5635 100644
--- a/homeassistant/components/homematic/climate.py
+++ b/homeassistant/components/homematic/climate.py
@@ -140,8 +140,10 @@ class HMThermostat(HMDevice, ClimateEntity):
 
     def set_temperature(self, **kwargs: Any) -> None:
         """Set new target temperature."""
-        if (temperature := kwargs.get(ATTR_TEMPERATURE)) is not None:
-            self._hmdevice.writeNodeData(self._state, float(temperature))
+        if (temperature := kwargs.get(ATTR_TEMPERATURE)) is None:
+            return None
+
+        self._hmdevice.writeNodeData(self._state, float(temperature))
 
     def set_hvac_mode(self, hvac_mode: HVACMode) -> None:
         """Set new target hvac mode."""
diff --git a/homeassistant/components/nest/media_source.py b/homeassistant/components/nest/media_source.py
index 1260474ad88..6c481806e4f 100644
--- a/homeassistant/components/nest/media_source.py
+++ b/homeassistant/components/nest/media_source.py
@@ -227,9 +227,10 @@ class NestEventMediaStore(EventMediaStore):
         filename = self.get_media_filename(media_key)
 
         def remove_media(filename: str) -> None:
-            if os.path.exists(filename):
-                _LOGGER.debug("Removing event media from disk store: %s", filename)
-                os.remove(filename)
+            if not os.path.exists(filename):
+                return None
+            _LOGGER.debug("Removing event media from disk store: %s", filename)
+            os.remove(filename)
 
         try:
             await self._hass.async_add_executor_job(remove_media, filename)
diff --git a/homeassistant/components/telnet/switch.py b/homeassistant/components/telnet/switch.py
index 8aae49f8730..805f037dbae 100644
--- a/homeassistant/components/telnet/switch.py
+++ b/homeassistant/components/telnet/switch.py
@@ -142,9 +142,10 @@ class TelnetSwitch(SwitchEntity):
         response = self._telnet_command(self._command_state)
         if response and self._value_template:
             rendered = self._value_template.render_with_possible_json_value(response)
-            self._attr_is_on = rendered == "True"
         else:
             _LOGGER.warning("Empty response for command: %s", self._command_state)
+            return None
+        self._attr_is_on = rendered == "True"
 
     def turn_on(self, **kwargs: Any) -> None:
         """Turn the device on."""
diff --git a/homeassistant/components/tradfri/switch.py b/homeassistant/components/tradfri/switch.py
index 88126f1ffce..4ad1424aa9a 100644
--- a/homeassistant/components/tradfri/switch.py
+++ b/homeassistant/components/tradfri/switch.py
@@ -72,10 +72,12 @@ class TradfriSwitch(TradfriBaseEntity, SwitchEntity):
 
     async def async_turn_off(self, **kwargs: Any) -> None:
         """Instruct the switch to turn off."""
-        if self._device_control:
-            await self._api(self._device_control.set_state(False))
+        if not self._device_control:
+            return None
+        await self._api(self._device_control.set_state(False))
 
     async def async_turn_on(self, **kwargs: Any) -> None:
         """Instruct the switch to turn on."""
-        if self._device_control:
-            await self._api(self._device_control.set_state(True))
+        if not self._device_control:
+            return None
+        await self._api(self._device_control.set_state(True))