diff --git a/.coveragerc b/.coveragerc
index 64acaa2d8e7..29ba3dcdeb1 100644
--- a/.coveragerc
+++ b/.coveragerc
@@ -847,6 +847,7 @@ omit =
     homeassistant/components/rituals_perfume_genie/binary_sensor.py
     homeassistant/components/rituals_perfume_genie/entity.py
     homeassistant/components/rituals_perfume_genie/number.py
+    homeassistant/components/rituals_perfume_genie/select.py
     homeassistant/components/rituals_perfume_genie/sensor.py
     homeassistant/components/rituals_perfume_genie/switch.py
     homeassistant/components/rituals_perfume_genie/__init__.py
diff --git a/homeassistant/components/rituals_perfume_genie/__init__.py b/homeassistant/components/rituals_perfume_genie/__init__.py
index 13699dcd64b..2bac2c03c04 100644
--- a/homeassistant/components/rituals_perfume_genie/__init__.py
+++ b/homeassistant/components/rituals_perfume_genie/__init__.py
@@ -13,7 +13,7 @@ from homeassistant.helpers.update_coordinator import DataUpdateCoordinator
 
 from .const import ACCOUNT_HASH, COORDINATORS, DEVICES, DOMAIN, HUBLOT
 
-PLATFORMS = ["binary_sensor", "number", "sensor", "switch"]
+PLATFORMS = ["binary_sensor", "number", "select", "sensor", "switch"]
 
 EMPTY_CREDENTIALS = ""
 
diff --git a/homeassistant/components/rituals_perfume_genie/number.py b/homeassistant/components/rituals_perfume_genie/number.py
index 5fde2adcb6f..86274dc2f88 100644
--- a/homeassistant/components/rituals_perfume_genie/number.py
+++ b/homeassistant/components/rituals_perfume_genie/number.py
@@ -1,8 +1,6 @@
 """Support for Rituals Perfume Genie numbers."""
 from __future__ import annotations
 
-import logging
-
 from pyrituals import Diffuser
 
 from homeassistant.components.number import NumberEntity
@@ -14,12 +12,8 @@ from . import RitualsDataUpdateCoordinator
 from .const import ATTRIBUTES, COORDINATORS, DEVICES, DOMAIN, SPEED
 from .entity import DiffuserEntity
 
-_LOGGER = logging.getLogger(__name__)
-
 MIN_PERFUME_AMOUNT = 1
 MAX_PERFUME_AMOUNT = 3
-MIN_ROOM_SIZE = 1
-MAX_ROOM_SIZE = 4
 
 PERFUME_AMOUNT_SUFFIX = " Perfume Amount"
 
@@ -40,7 +34,7 @@ async def async_setup_entry(
     async_add_entities(entities)
 
 
-class DiffuserPerfumeAmount(NumberEntity, DiffuserEntity):
+class DiffuserPerfumeAmount(DiffuserEntity, NumberEntity):
     """Representation of a diffuser perfume amount number."""
 
     def __init__(
@@ -74,9 +68,7 @@ class DiffuserPerfumeAmount(NumberEntity, DiffuserEntity):
         if value.is_integer() and MIN_PERFUME_AMOUNT <= value <= MAX_PERFUME_AMOUNT:
             await self._diffuser.set_perfume_amount(int(value))
         else:
-            _LOGGER.warning(
-                "Can't set the perfume amount to %s. Perfume amount must be an integer between %s and %s, inclusive",
-                value,
-                MIN_PERFUME_AMOUNT,
-                MAX_PERFUME_AMOUNT,
+            raise ValueError(
+                f"Can't set the perfume amount to {value}. "
+                f"Perfume amount must be an integer between {self.min_value} and {self.max_value}, inclusive"
             )
diff --git a/homeassistant/components/rituals_perfume_genie/select.py b/homeassistant/components/rituals_perfume_genie/select.py
new file mode 100644
index 00000000000..17e71c38ae8
--- /dev/null
+++ b/homeassistant/components/rituals_perfume_genie/select.py
@@ -0,0 +1,71 @@
+"""Support for Rituals Perfume Genie numbers."""
+from __future__ import annotations
+
+from pyrituals import Diffuser
+
+from homeassistant.components.select import SelectEntity
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.const import AREA_SQUARE_METERS
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers.entity_platform import AddEntitiesCallback
+
+from . import RitualsDataUpdateCoordinator
+from .const import ATTRIBUTES, COORDINATORS, DEVICES, DOMAIN, ROOM
+from .entity import DiffuserEntity
+
+ROOM_SIZE_SUFFIX = " Room Size"
+
+
+async def async_setup_entry(
+    hass: HomeAssistant,
+    config_entry: ConfigEntry,
+    async_add_entities: AddEntitiesCallback,
+) -> None:
+    """Set up the diffuser select entities."""
+    diffusers = hass.data[DOMAIN][config_entry.entry_id][DEVICES]
+    coordinators = hass.data[DOMAIN][config_entry.entry_id][COORDINATORS]
+    async_add_entities(
+        DiffuserRoomSize(diffuser, coordinators[hublot])
+        for hublot, diffuser in diffusers.items()
+    )
+
+
+class DiffuserRoomSize(DiffuserEntity, SelectEntity):
+    """Representation of a diffuser room size select entity."""
+
+    _attr_icon = "mdi:ruler-square"
+    _attr_unit_of_measurement = AREA_SQUARE_METERS
+    _attr_options = ["15", "30", "60", "100"]
+
+    def __init__(
+        self, diffuser: Diffuser, coordinator: RitualsDataUpdateCoordinator
+    ) -> None:
+        """Initialize the diffuser room size select entity."""
+        super().__init__(diffuser, coordinator, ROOM_SIZE_SUFFIX)
+        self._attr_entity_registry_enabled_default = diffuser.has_battery
+
+    @property
+    def current_option(self) -> str:
+        """Return the diffuser room size."""
+        return {
+            "1": "15",
+            "2": "30",
+            "3": "60",
+            "4": "100",
+        }[self._diffuser.hub_data[ATTRIBUTES][ROOM]]
+
+    async def async_select_option(self, option: str) -> None:
+        """Change the diffuser room size."""
+        if option in self.options:
+            await self._diffuser.set_room_size(
+                {
+                    "15": 1,
+                    "30": 2,
+                    "60": 3,
+                    "100": 4,
+                }[option]
+            )
+        else:
+            raise ValueError(
+                f"Can't set the room size to {option}. Allowed room sizes are: {self.options}"
+            )