diff --git a/homeassistant/components/nad/media_player.py b/homeassistant/components/nad/media_player.py
index f031175a321..6304109c325 100644
--- a/homeassistant/components/nad/media_player.py
+++ b/homeassistant/components/nad/media_player.py
@@ -133,34 +133,34 @@ class NAD(MediaPlayerEntity):
         """Boolean if volume is currently muted."""
         return self._mute
 
-    def turn_off(self):
+    def turn_off(self) -> None:
         """Turn the media player off."""
         self._nad_receiver.main_power("=", "Off")
 
-    def turn_on(self):
+    def turn_on(self) -> None:
         """Turn the media player on."""
         self._nad_receiver.main_power("=", "On")
 
-    def volume_up(self):
+    def volume_up(self) -> None:
         """Volume up the media player."""
         self._nad_receiver.main_volume("+")
 
-    def volume_down(self):
+    def volume_down(self) -> None:
         """Volume down the media player."""
         self._nad_receiver.main_volume("-")
 
-    def set_volume_level(self, volume):
+    def set_volume_level(self, volume: float) -> None:
         """Set volume level, range 0..1."""
         self._nad_receiver.main_volume("=", self.calc_db(volume))
 
-    def mute_volume(self, mute):
+    def mute_volume(self, mute: bool) -> None:
         """Mute (true) or unmute (false) media player."""
         if mute:
             self._nad_receiver.main_mute("=", "On")
         else:
             self._nad_receiver.main_mute("=", "Off")
 
-    def select_source(self, source):
+    def select_source(self, source: str) -> None:
         """Select input source."""
         self._nad_receiver.main_source("=", self._reverse_mapping.get(source))
 
@@ -175,7 +175,7 @@ class NAD(MediaPlayerEntity):
         return sorted(self._reverse_mapping)
 
     @property
-    def available(self):
+    def available(self) -> bool:
         """Return if device is available."""
         return self._state is not None
 
@@ -257,37 +257,37 @@ class NADtcp(MediaPlayerEntity):
         """Boolean if volume is currently muted."""
         return self._mute
 
-    def turn_off(self):
+    def turn_off(self) -> None:
         """Turn the media player off."""
         self._nad_receiver.power_off()
 
-    def turn_on(self):
+    def turn_on(self) -> None:
         """Turn the media player on."""
         self._nad_receiver.power_on()
 
-    def volume_up(self):
+    def volume_up(self) -> None:
         """Step volume up in the configured increments."""
         self._nad_receiver.set_volume(self._nad_volume + 2 * self._volume_step)
 
-    def volume_down(self):
+    def volume_down(self) -> None:
         """Step volume down in the configured increments."""
         self._nad_receiver.set_volume(self._nad_volume - 2 * self._volume_step)
 
-    def set_volume_level(self, volume):
+    def set_volume_level(self, volume: float) -> None:
         """Set volume level, range 0..1."""
         nad_volume_to_set = int(
             round(volume * (self._max_vol - self._min_vol) + self._min_vol)
         )
         self._nad_receiver.set_volume(nad_volume_to_set)
 
-    def mute_volume(self, mute):
+    def mute_volume(self, mute: bool) -> None:
         """Mute (true) or unmute (false) media player."""
         if mute:
             self._nad_receiver.mute()
         else:
             self._nad_receiver.unmute()
 
-    def select_source(self, source):
+    def select_source(self, source: str) -> None:
         """Select input source."""
         self._nad_receiver.select_source(source)
 
@@ -301,7 +301,7 @@ class NADtcp(MediaPlayerEntity):
         """List of available input sources."""
         return self._nad_receiver.available_sources()
 
-    def update(self):
+    def update(self) -> None:
         """Get the latest details from the device."""
         try:
             nad_status = self._nad_receiver.status()
diff --git a/homeassistant/components/nederlandse_spoorwegen/sensor.py b/homeassistant/components/nederlandse_spoorwegen/sensor.py
index 84fd1f0569b..063fd12f5e0 100644
--- a/homeassistant/components/nederlandse_spoorwegen/sensor.py
+++ b/homeassistant/components/nederlandse_spoorwegen/sensor.py
@@ -219,7 +219,7 @@ class NSDepartureSensor(SensorEntity):
         return attributes
 
     @Throttle(MIN_TIME_BETWEEN_UPDATES)
-    def update(self):
+    def update(self) -> None:
         """Get the trip information."""
 
         # If looking for a specific trip time, update around that trip time only.
diff --git a/homeassistant/components/ness_alarm/binary_sensor.py b/homeassistant/components/ness_alarm/binary_sensor.py
index 4855ce28b72..117d65b0940 100644
--- a/homeassistant/components/ness_alarm/binary_sensor.py
+++ b/homeassistant/components/ness_alarm/binary_sensor.py
@@ -55,7 +55,7 @@ class NessZoneBinarySensor(BinarySensorEntity):
         self._type = zone_type
         self._state = 0
 
-    async def async_added_to_hass(self):
+    async def async_added_to_hass(self) -> None:
         """Register callbacks."""
         self.async_on_remove(
             async_dispatcher_connect(
diff --git a/homeassistant/components/netdata/sensor.py b/homeassistant/components/netdata/sensor.py
index 97007ec076f..8c51a3fd9a6 100644
--- a/homeassistant/components/netdata/sensor.py
+++ b/homeassistant/components/netdata/sensor.py
@@ -140,11 +140,11 @@ class NetdataSensor(SensorEntity):
         return self._state
 
     @property
-    def available(self):
+    def available(self) -> bool:
         """Could the resource be accessed during the last update call."""
         return self.netdata.available
 
-    async def async_update(self):
+    async def async_update(self) -> None:
         """Get the latest data from Netdata REST API."""
         await self.netdata.async_update()
         resource_data = self.netdata.api.metrics.get(self._sensor)
@@ -186,11 +186,11 @@ class NetdataAlarms(SensorEntity):
         return "mdi:crosshairs-question"
 
     @property
-    def available(self):
+    def available(self) -> bool:
         """Could the resource be accessed during the last update call."""
         return self.netdata.available
 
-    async def async_update(self):
+    async def async_update(self) -> None:
         """Get the latest alarms from Netdata REST API."""
         await self.netdata.async_update()
         alarms = self.netdata.api.alarms["alarms"]
diff --git a/homeassistant/components/netgear/switch.py b/homeassistant/components/netgear/switch.py
index b38179ccb2a..7eab606382d 100644
--- a/homeassistant/components/netgear/switch.py
+++ b/homeassistant/components/netgear/switch.py
@@ -1,5 +1,6 @@
 """Support for Netgear switches."""
 import logging
+from typing import Any
 
 from pynetgear import ALLOW, BLOCK
 
@@ -87,12 +88,12 @@ class NetgearAllowBlock(NetgearDeviceEntity, SwitchEntity):
         """Return true if switch is on."""
         return self._state
 
-    async def async_turn_on(self, **kwargs):
+    async def async_turn_on(self, **kwargs: Any) -> None:
         """Turn the switch on."""
         await self._router.async_allow_block_device(self._mac, ALLOW)
         await self.coordinator.async_request_refresh()
 
-    async def async_turn_off(self, **kwargs):
+    async def async_turn_off(self, **kwargs: Any) -> None:
         """Turn the switch off."""
         await self._router.async_allow_block_device(self._mac, BLOCK)
         await self.coordinator.async_request_refresh()
diff --git a/homeassistant/components/netio/switch.py b/homeassistant/components/netio/switch.py
index cfd736c9538..546aa07e22d 100644
--- a/homeassistant/components/netio/switch.py
+++ b/homeassistant/components/netio/switch.py
@@ -4,6 +4,7 @@ from __future__ import annotations
 from collections import namedtuple
 from datetime import timedelta
 import logging
+from typing import Any
 
 from pynetio import Netio
 import voluptuous as vol
@@ -148,15 +149,15 @@ class NetioSwitch(SwitchEntity):
         return self._name
 
     @property
-    def available(self):
+    def available(self) -> bool:
         """Return true if entity is available."""
         return not hasattr(self, "telnet")
 
-    def turn_on(self, **kwargs):
+    def turn_on(self, **kwargs: Any) -> None:
         """Turn switch on."""
         self._set(True)
 
-    def turn_off(self, **kwargs):
+    def turn_off(self, **kwargs: Any) -> None:
         """Turn switch off."""
         self._set(False)
 
@@ -172,6 +173,6 @@ class NetioSwitch(SwitchEntity):
         """Return the switch's status."""
         return self.netio.states[int(self.outlet) - 1]
 
-    def update(self):
+    def update(self) -> None:
         """Update the state."""
         self.netio.update()
diff --git a/homeassistant/components/neurio_energy/sensor.py b/homeassistant/components/neurio_energy/sensor.py
index 8270e89a33c..a1f6791fa5a 100644
--- a/homeassistant/components/neurio_energy/sensor.py
+++ b/homeassistant/components/neurio_energy/sensor.py
@@ -177,7 +177,7 @@ class NeurioEnergy(SensorEntity):
         """Icon to use in the frontend, if any."""
         return ICON
 
-    def update(self):
+    def update(self) -> None:
         """Get the latest data, update state."""
         self.update_sensor()
 
diff --git a/homeassistant/components/nexia/climate.py b/homeassistant/components/nexia/climate.py
index 33ad91e1561..7a487d0b975 100644
--- a/homeassistant/components/nexia/climate.py
+++ b/homeassistant/components/nexia/climate.py
@@ -1,6 +1,8 @@
 """Support for Nexia / Trane XL thermostats."""
 from __future__ import annotations
 
+from typing import Any
+
 from nexia.const import (
     HOLD_PERMANENT,
     HOLD_RESUME_SCHEDULE,
@@ -195,7 +197,7 @@ class NexiaZone(NexiaThermostatZoneEntity, ClimateEntity):
         """Return the fan setting."""
         return self._thermostat.get_fan_mode()
 
-    async def async_set_fan_mode(self, fan_mode):
+    async def async_set_fan_mode(self, fan_mode: str) -> None:
         """Set new target fan mode."""
         await self._thermostat.set_fan_mode(fan_mode)
         self._signal_thermostat_update()
@@ -216,7 +218,7 @@ class NexiaZone(NexiaThermostatZoneEntity, ClimateEntity):
         """Preset that is active."""
         return self._zone.get_preset()
 
-    async def async_set_humidity(self, humidity):
+    async def async_set_humidity(self, humidity: int) -> None:
         """Dehumidify target."""
         if self._thermostat.has_dehumidify_support():
             await self.async_set_dehumidify_setpoint(humidity)
@@ -303,7 +305,7 @@ class NexiaZone(NexiaThermostatZoneEntity, ClimateEntity):
 
         return NEXIA_TO_HA_HVAC_MODE_MAP[mode]
 
-    async def async_set_temperature(self, **kwargs):
+    async def async_set_temperature(self, **kwargs: Any) -> None:
         """Set target temperature."""
         new_heat_temp = kwargs.get(ATTR_TARGET_TEMP_LOW)
         new_cool_temp = kwargs.get(ATTR_TARGET_TEMP_HIGH)
@@ -364,27 +366,27 @@ class NexiaZone(NexiaThermostatZoneEntity, ClimateEntity):
             attrs[ATTR_HUMIDIFY_SETPOINT] = humdify_setpoint
         return attrs
 
-    async def async_set_preset_mode(self, preset_mode: str):
+    async def async_set_preset_mode(self, preset_mode: str) -> None:
         """Set the preset mode."""
         await self._zone.set_preset(preset_mode)
         self._signal_zone_update()
 
-    async def async_turn_aux_heat_off(self):
+    async def async_turn_aux_heat_off(self) -> None:
         """Turn Aux Heat off."""
         await self._thermostat.set_emergency_heat(False)
         self._signal_thermostat_update()
 
-    async def async_turn_aux_heat_on(self):
+    async def async_turn_aux_heat_on(self) -> None:
         """Turn Aux Heat on."""
         self._thermostat.set_emergency_heat(True)
         self._signal_thermostat_update()
 
-    async def async_turn_off(self):
+    async def async_turn_off(self) -> None:
         """Turn off the zone."""
         await self.async_set_hvac_mode(OPERATION_MODE_OFF)
         self._signal_zone_update()
 
-    async def async_turn_on(self):
+    async def async_turn_on(self) -> None:
         """Turn on the zone."""
         await self.async_set_hvac_mode(OPERATION_MODE_AUTO)
         self._signal_zone_update()
diff --git a/homeassistant/components/nextbus/sensor.py b/homeassistant/components/nextbus/sensor.py
index 12d43f32d07..5ab5d79caf7 100644
--- a/homeassistant/components/nextbus/sensor.py
+++ b/homeassistant/components/nextbus/sensor.py
@@ -169,7 +169,7 @@ class NextBusDepartureSensor(SensorEntity):
         """Return additional state attributes."""
         return self._attributes
 
-    def update(self):
+    def update(self) -> None:
         """Update sensor with new departures times."""
         # Note: using Multi because there is a bug with the single stop impl
         results = self._client.get_predictions_for_multi_stops(
diff --git a/homeassistant/components/nextcloud/binary_sensor.py b/homeassistant/components/nextcloud/binary_sensor.py
index fca0c7b44a7..e9d5b4a8d7f 100644
--- a/homeassistant/components/nextcloud/binary_sensor.py
+++ b/homeassistant/components/nextcloud/binary_sensor.py
@@ -53,6 +53,6 @@ class NextcloudBinarySensor(BinarySensorEntity):
         """Return the unique ID for this binary sensor."""
         return f"{self.hass.data[DOMAIN]['instance']}#{self._name}"
 
-    def update(self):
+    def update(self) -> None:
         """Update the binary sensor."""
         self._is_on = self.hass.data[DOMAIN][self._name]
diff --git a/homeassistant/components/nextcloud/sensor.py b/homeassistant/components/nextcloud/sensor.py
index e912bcdd806..31caa46028f 100644
--- a/homeassistant/components/nextcloud/sensor.py
+++ b/homeassistant/components/nextcloud/sensor.py
@@ -53,6 +53,6 @@ class NextcloudSensor(SensorEntity):
         """Return the unique ID for this sensor."""
         return f"{self.hass.data[DOMAIN]['instance']}#{self._name}"
 
-    def update(self):
+    def update(self) -> None:
         """Update the sensor."""
         self._state = self.hass.data[DOMAIN][self._name]
diff --git a/homeassistant/components/nina/config_flow.py b/homeassistant/components/nina/config_flow.py
index aa06b00e0ad..bdaf164fadb 100644
--- a/homeassistant/components/nina/config_flow.py
+++ b/homeassistant/components/nina/config_flow.py
@@ -153,7 +153,9 @@ class ConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
 
     @staticmethod
     @callback
-    def async_get_options_flow(config_entry):
+    def async_get_options_flow(
+        config_entry: config_entries.ConfigEntry,
+    ) -> OptionsFlowHandler:
         """Get the options flow for this handler."""
         return OptionsFlowHandler(config_entry)
 
diff --git a/homeassistant/components/nmbs/sensor.py b/homeassistant/components/nmbs/sensor.py
index fdb03652756..56fa0cd4a8d 100644
--- a/homeassistant/components/nmbs/sensor.py
+++ b/homeassistant/components/nmbs/sensor.py
@@ -158,7 +158,7 @@ class NMBSLiveBoard(SensorEntity):
 
         return attrs
 
-    def update(self):
+    def update(self) -> None:
         """Set the state equal to the next departure."""
         liveboard = self._api_client.get_liveboard(self._station)
 
@@ -278,7 +278,7 @@ class NMBSSensor(SensorEntity):
 
         return "vias" in self._attrs and int(self._attrs["vias"]["number"]) > 0
 
-    def update(self):
+    def update(self) -> None:
         """Set the state to the duration of a connection."""
         connections = self._api_client.get_connections(
             self._station_from, self._station_to
diff --git a/homeassistant/components/noaa_tides/sensor.py b/homeassistant/components/noaa_tides/sensor.py
index 6e398fa7183..49635973cf8 100644
--- a/homeassistant/components/noaa_tides/sensor.py
+++ b/homeassistant/components/noaa_tides/sensor.py
@@ -130,7 +130,7 @@ class NOAATidesAndCurrentsSensor(SensorEntity):
             return f"Low tide at {tidetime}"
         return None
 
-    def update(self):
+    def update(self) -> None:
         """Get the latest data from NOAA Tides and Currents API."""
         begin = datetime.now()
         delta = timedelta(days=2)
diff --git a/homeassistant/components/nuheat/climate.py b/homeassistant/components/nuheat/climate.py
index 6cc70965ade..78e93ad5cea 100644
--- a/homeassistant/components/nuheat/climate.py
+++ b/homeassistant/components/nuheat/climate.py
@@ -2,6 +2,7 @@
 from datetime import datetime
 import logging
 import time
+from typing import Any
 
 from nuheat.config import SCHEDULE_HOLD, SCHEDULE_RUN, SCHEDULE_TEMPORARY_HOLD
 from nuheat.util import (
@@ -100,7 +101,7 @@ class NuHeatThermostat(CoordinatorEntity, ClimateEntity):
         return self._thermostat.room
 
     @property
-    def temperature_unit(self):
+    def temperature_unit(self) -> str:
         """Return the unit of measurement."""
         if self._temperature_unit == "C":
             return TEMP_CELSIUS
@@ -121,7 +122,7 @@ class NuHeatThermostat(CoordinatorEntity, ClimateEntity):
         return self._thermostat.serial_number
 
     @property
-    def available(self):
+    def available(self) -> bool:
         """Return the unique id."""
         return self.coordinator.last_update_success and self._thermostat.online
 
@@ -178,7 +179,7 @@ class NuHeatThermostat(CoordinatorEntity, ClimateEntity):
         """Return available preset modes."""
         return PRESET_MODES
 
-    def set_preset_mode(self, preset_mode):
+    def set_preset_mode(self, preset_mode: str) -> None:
         """Update the hold mode of the thermostat."""
         self._set_schedule_mode(
             PRESET_MODE_TO_SCHEDULE_MODE_MAP.get(preset_mode, SCHEDULE_RUN)
@@ -191,7 +192,7 @@ class NuHeatThermostat(CoordinatorEntity, ClimateEntity):
         self._thermostat.schedule_mode = schedule_mode
         self._schedule_update()
 
-    def set_temperature(self, **kwargs):
+    def set_temperature(self, **kwargs: Any) -> None:
         """Set a new target temperature."""
         self._set_temperature_and_mode(
             kwargs.get(ATTR_TEMPERATURE), hvac_mode=kwargs.get(ATTR_HVAC_MODE)
diff --git a/homeassistant/components/nuki/binary_sensor.py b/homeassistant/components/nuki/binary_sensor.py
index 4c59c121e6d..69c48133533 100644
--- a/homeassistant/components/nuki/binary_sensor.py
+++ b/homeassistant/components/nuki/binary_sensor.py
@@ -54,7 +54,7 @@ class NukiDoorsensorEntity(NukiEntity, BinarySensorEntity):
         return data
 
     @property
-    def available(self):
+    def available(self) -> bool:
         """Return true if door sensor is present and activated."""
         return super().available and self._nuki_device.is_door_sensor_activated
 
diff --git a/homeassistant/components/numato/binary_sensor.py b/homeassistant/components/numato/binary_sensor.py
index b3881cc0493..c326a45d462 100644
--- a/homeassistant/components/numato/binary_sensor.py
+++ b/homeassistant/components/numato/binary_sensor.py
@@ -92,7 +92,7 @@ class NumatoGpioBinarySensor(BinarySensorEntity):
         self._state = None
         self._api = api
 
-    async def async_added_to_hass(self):
+    async def async_added_to_hass(self) -> None:
         """Connect state update callback."""
         self.async_on_remove(
             async_dispatcher_connect(
@@ -118,7 +118,7 @@ class NumatoGpioBinarySensor(BinarySensorEntity):
         """Return the state of the entity."""
         return self._state != self._invert_logic
 
-    def update(self):
+    def update(self) -> None:
         """Update the GPIO state."""
         try:
             self._state = self._api.read_input(self._device_id, self._port)
diff --git a/homeassistant/components/numato/sensor.py b/homeassistant/components/numato/sensor.py
index 8183e4c6796..4ac28e07611 100644
--- a/homeassistant/components/numato/sensor.py
+++ b/homeassistant/components/numato/sensor.py
@@ -102,7 +102,7 @@ class NumatoGpioAdc(SensorEntity):
         """Return the icon to use in the frontend, if any."""
         return ICON
 
-    def update(self):
+    def update(self) -> None:
         """Get the latest data and updates the state."""
         try:
             adc_val = self._api.read_adc_input(self._device_id, self._port)
diff --git a/homeassistant/components/numato/switch.py b/homeassistant/components/numato/switch.py
index fb18866ae93..92fc7e0e2df 100644
--- a/homeassistant/components/numato/switch.py
+++ b/homeassistant/components/numato/switch.py
@@ -2,6 +2,7 @@
 from __future__ import annotations
 
 import logging
+from typing import Any
 
 from numato_gpio import NumatoGpioError
 
@@ -88,7 +89,7 @@ class NumatoGpioSwitch(SwitchEntity):
         """Return true if port is turned on."""
         return self._state
 
-    def turn_on(self, **kwargs):
+    def turn_on(self, **kwargs: Any) -> None:
         """Turn the port on."""
         try:
             self._api.write_output(
@@ -104,7 +105,7 @@ class NumatoGpioSwitch(SwitchEntity):
                 err,
             )
 
-    def turn_off(self, **kwargs):
+    def turn_off(self, **kwargs: Any) -> None:
         """Turn the port off."""
         try:
             self._api.write_output(
diff --git a/homeassistant/components/nws/sensor.py b/homeassistant/components/nws/sensor.py
index 3bcfd19407d..ec53d909561 100644
--- a/homeassistant/components/nws/sensor.py
+++ b/homeassistant/components/nws/sensor.py
@@ -109,7 +109,7 @@ class NWSSensor(CoordinatorEntity, SensorEntity):
         return f"{base_unique_id(self._latitude, self._longitude)}_{self.entity_description.key}"
 
     @property
-    def available(self):
+    def available(self) -> bool:
         """Return if state is available."""
         if self.coordinator.last_update_success_time:
             last_success_time = (
diff --git a/homeassistant/components/nws/weather.py b/homeassistant/components/nws/weather.py
index 60f93f20177..eb6f7a4f39d 100644
--- a/homeassistant/components/nws/weather.py
+++ b/homeassistant/components/nws/weather.py
@@ -269,7 +269,7 @@ class NWSWeather(WeatherEntity):
         return f"{base_unique_id(self.latitude, self.longitude)}_{self.mode}"
 
     @property
-    def available(self):
+    def available(self) -> bool:
         """Return if state is available."""
         last_success = (
             self.coordinator_observation.last_update_success
@@ -289,7 +289,7 @@ class NWSWeather(WeatherEntity):
             last_success_time = False
         return last_success or last_success_time
 
-    async def async_update(self):
+    async def async_update(self) -> None:
         """Update the entity.
 
         Only used by the generic entity update service.
diff --git a/homeassistant/components/nzbget/switch.py b/homeassistant/components/nzbget/switch.py
index 4e4cca34aa8..74b49b63501 100644
--- a/homeassistant/components/nzbget/switch.py
+++ b/homeassistant/components/nzbget/switch.py
@@ -1,6 +1,8 @@
 """Support for NZBGet switches."""
 from __future__ import annotations
 
+from typing import Any
+
 from homeassistant.components.switch import SwitchEntity
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import CONF_NAME
@@ -61,12 +63,12 @@ class NZBGetDownloadSwitch(NZBGetEntity, SwitchEntity):
         """Return the state of the switch."""
         return not self.coordinator.data["status"].get("DownloadPaused", False)
 
-    async def async_turn_on(self, **kwargs) -> None:
+    async def async_turn_on(self, **kwargs: Any) -> None:
         """Set downloads to enabled."""
         await self.hass.async_add_executor_job(self.coordinator.nzbget.resumedownload)
         await self.coordinator.async_request_refresh()
 
-    async def async_turn_off(self, **kwargs) -> None:
+    async def async_turn_off(self, **kwargs: Any) -> None:
         """Set downloads to paused."""
         await self.hass.async_add_executor_job(self.coordinator.nzbget.pausedownload)
         await self.coordinator.async_request_refresh()