diff --git a/huum/huum.py b/huum/huum.py
index f933e99..c867338 100644
--- a/huum/huum.py
+++ b/huum/huum.py
@@ -95,7 +95,7 @@ async def turn_on(self, temperature: int, safety_override: bool = False) -> Huum
         Returns:
             A `HuumStatusResponse` from the Huum API
         """
-        if temperature not in range(self.min_temp, self.max_temp):
+        if temperature not in range(self.min_temp, self.max_temp + 1):
             raise ValueError(
                 f"Temperature '{temperature}' must be between {self.min_temp}-{self.max_temp}"
             )