diff --git a/homeassistant/components/vallox/__init__.py b/homeassistant/components/vallox/__init__.py
index 6f88afa66cf..031c47a1233 100644
--- a/homeassistant/components/vallox/__init__.py
+++ b/homeassistant/components/vallox/__init__.py
@@ -1,6 +1,5 @@
 """Support for Vallox ventilation units."""
 
-from datetime import timedelta
 import ipaddress
 import logging
 
@@ -15,19 +14,21 @@ from homeassistant.helpers.discovery import async_load_platform
 from homeassistant.helpers.dispatcher import async_dispatcher_send
 from homeassistant.helpers.event import async_track_time_interval
 
+from .const import (
+    DEFAULT_FAN_SPEED_AWAY,
+    DEFAULT_FAN_SPEED_BOOST,
+    DEFAULT_FAN_SPEED_HOME,
+    DEFAULT_NAME,
+    DOMAIN,
+    METRIC_KEY_PROFILE_FAN_SPEED_AWAY,
+    METRIC_KEY_PROFILE_FAN_SPEED_BOOST,
+    METRIC_KEY_PROFILE_FAN_SPEED_HOME,
+    SIGNAL_VALLOX_STATE_UPDATE,
+    STATE_PROXY_SCAN_INTERVAL,
+)
+
 _LOGGER = logging.getLogger(__name__)
 
-DOMAIN = "vallox"
-DEFAULT_NAME = "Vallox"
-SIGNAL_VALLOX_STATE_UPDATE = "vallox_state_update"
-SCAN_INTERVAL = timedelta(seconds=60)
-
-# Various metric keys that are reused between profiles.
-METRIC_KEY_MODE = "A_CYC_MODE"
-METRIC_KEY_PROFILE_FAN_SPEED_HOME = "A_CYC_HOME_SPEED_SETTING"
-METRIC_KEY_PROFILE_FAN_SPEED_AWAY = "A_CYC_AWAY_SPEED_SETTING"
-METRIC_KEY_PROFILE_FAN_SPEED_BOOST = "A_CYC_BOOST_SPEED_SETTING"
-
 CONFIG_SCHEMA = vol.Schema(
     {
         DOMAIN: vol.Schema(
@@ -93,10 +94,6 @@ SERVICE_TO_METHOD = {
     },
 }
 
-DEFAULT_FAN_SPEED_HOME = 50
-DEFAULT_FAN_SPEED_AWAY = 25
-DEFAULT_FAN_SPEED_BOOST = 65
-
 
 async def async_setup(hass, config):
     """Set up the client and boot the platforms."""
@@ -126,7 +123,7 @@ async def async_setup(hass, config):
     hass.async_create_task(async_load_platform(hass, "sensor", DOMAIN, {}, config))
     hass.async_create_task(async_load_platform(hass, "fan", DOMAIN, {}, config))
 
-    async_track_time_interval(hass, state_proxy.async_update, SCAN_INTERVAL)
+    async_track_time_interval(hass, state_proxy.async_update, STATE_PROXY_SCAN_INTERVAL)
 
     return True
 
@@ -218,7 +215,7 @@ class ValloxServiceHandler:
     async def async_set_profile_fan_speed_away(
         self, fan_speed: int = DEFAULT_FAN_SPEED_AWAY
     ) -> bool:
-        """Set the fan speed in percent for the Home profile."""
+        """Set the fan speed in percent for the Away profile."""
         _LOGGER.debug("Setting Away fan speed to: %d%%", fan_speed)
 
         try:
diff --git a/homeassistant/components/vallox/const.py b/homeassistant/components/vallox/const.py
new file mode 100644
index 00000000000..038e46043da
--- /dev/null
+++ b/homeassistant/components/vallox/const.py
@@ -0,0 +1,22 @@
+"""Constants for the Vallox integration."""
+
+from datetime import timedelta
+
+DOMAIN = "vallox"
+DEFAULT_NAME = "Vallox"
+
+SIGNAL_VALLOX_STATE_UPDATE = "vallox_state_update"
+STATE_PROXY_SCAN_INTERVAL = timedelta(seconds=60)
+
+# Common metric keys and (default) values.
+METRIC_KEY_MODE = "A_CYC_MODE"
+METRIC_KEY_PROFILE_FAN_SPEED_HOME = "A_CYC_HOME_SPEED_SETTING"
+METRIC_KEY_PROFILE_FAN_SPEED_AWAY = "A_CYC_AWAY_SPEED_SETTING"
+METRIC_KEY_PROFILE_FAN_SPEED_BOOST = "A_CYC_BOOST_SPEED_SETTING"
+
+MODE_ON = 0
+MODE_OFF = 5
+
+DEFAULT_FAN_SPEED_HOME = 50
+DEFAULT_FAN_SPEED_AWAY = 25
+DEFAULT_FAN_SPEED_BOOST = 65
diff --git a/homeassistant/components/vallox/fan.py b/homeassistant/components/vallox/fan.py
index e167791e702..0c887daaef5 100644
--- a/homeassistant/components/vallox/fan.py
+++ b/homeassistant/components/vallox/fan.py
@@ -6,12 +6,14 @@ from homeassistant.components.fan import FanEntity
 from homeassistant.core import callback
 from homeassistant.helpers.dispatcher import async_dispatcher_connect
 
-from . import (
+from .const import (
     DOMAIN,
     METRIC_KEY_MODE,
     METRIC_KEY_PROFILE_FAN_SPEED_AWAY,
     METRIC_KEY_PROFILE_FAN_SPEED_BOOST,
     METRIC_KEY_PROFILE_FAN_SPEED_HOME,
+    MODE_OFF,
+    MODE_ON,
     SIGNAL_VALLOX_STATE_UPDATE,
 )
 
@@ -109,7 +111,7 @@ class ValloxFan(FanEntity):
         try:
             # Fetch if the whole device is in regular operation state.
             mode = self._state_proxy.fetch_metric(METRIC_KEY_MODE)
-            if mode == 0:
+            if mode == MODE_ON:
                 self._state = True
             else:
                 self._state = False
@@ -161,7 +163,7 @@ class ValloxFan(FanEntity):
 
         if self._state is False:
             try:
-                await self._client.set_values({METRIC_KEY_MODE: 0})
+                await self._client.set_values({METRIC_KEY_MODE: MODE_ON})
 
                 # This state change affects other entities like sensors. Force
                 # an immediate update that can be observed by all parties
@@ -178,7 +180,7 @@ class ValloxFan(FanEntity):
         """Turn the device off."""
         if self._state is True:
             try:
-                await self._client.set_values({METRIC_KEY_MODE: 5})
+                await self._client.set_values({METRIC_KEY_MODE: MODE_OFF})
 
                 # Same as for turn_on method.
                 await self._state_proxy.async_update(None)
diff --git a/homeassistant/components/vallox/sensor.py b/homeassistant/components/vallox/sensor.py
index 4e4dc6cdddf..99365762977 100644
--- a/homeassistant/components/vallox/sensor.py
+++ b/homeassistant/components/vallox/sensor.py
@@ -22,7 +22,8 @@ from homeassistant.const import (
 from homeassistant.core import callback
 from homeassistant.helpers.dispatcher import async_dispatcher_connect
 
-from . import DOMAIN, METRIC_KEY_MODE, SIGNAL_VALLOX_STATE_UPDATE, ValloxStateProxy
+from . import ValloxStateProxy
+from .const import DOMAIN, METRIC_KEY_MODE, MODE_ON, SIGNAL_VALLOX_STATE_UPDATE
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -101,7 +102,7 @@ class ValloxFanSpeedSensor(ValloxSensor):
         """Fetch state from the ventilation unit."""
         try:
             # If device is in regular operation, continue.
-            if self._state_proxy.fetch_metric(METRIC_KEY_MODE) == 0:
+            if self._state_proxy.fetch_metric(METRIC_KEY_MODE) == MODE_ON:
                 await super().async_update()
             else:
                 # Report zero percent otherwise.