From 1c96cf33b894f1d6ba5d5a65405d2a49946028fe Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@koston.org>
Date: Mon, 25 Dec 2023 21:11:48 -1000
Subject: [PATCH] Avoid recreating a set each time sensor unit_of_measurement
 is called (#106401)

---
 homeassistant/components/sensor/__init__.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/homeassistant/components/sensor/__init__.py b/homeassistant/components/sensor/__init__.py
index 9965fae9d59..5fca119d5b5 100644
--- a/homeassistant/components/sensor/__init__.py
+++ b/homeassistant/components/sensor/__init__.py
@@ -198,6 +198,8 @@ CACHED_PROPERTIES_WITH_ATTR_ = {
     "suggested_unit_of_measurement",
 }
 
+TEMPERATURE_UNITS = {UnitOfTemperature.CELSIUS, UnitOfTemperature.FAHRENHEIT}
+
 
 class SensorEntity(Entity, cached_properties=CACHED_PROPERTIES_WITH_ATTR_):
     """Base class for sensor entities."""
@@ -509,8 +511,7 @@ class SensorEntity(Entity, cached_properties=CACHED_PROPERTIES_WITH_ATTR_):
         native_unit_of_measurement = self.native_unit_of_measurement
 
         if (
-            native_unit_of_measurement
-            in {UnitOfTemperature.CELSIUS, UnitOfTemperature.FAHRENHEIT}
+            native_unit_of_measurement in TEMPERATURE_UNITS
             and self.device_class is SensorDeviceClass.TEMPERATURE
         ):
             return self.hass.config.units.temperature_unit