diff --git a/CHANGELOG.md b/CHANGELOG.md
index b0790e3ed9..c86e5004a8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -70,6 +70,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Rewrote ThermalHouseTest from groovy to scala [#646](https://github.com/ie3-institute/simona/issues/646)
 - Updated dependabot reviewers [#888](https://github.com/ie3-institute/simona/issues/888)
 - Merged `HpModelTestData` with `HpTestData` to `HpInputTestData` [#872](https://github.com/ie3-institute/simona/issues/872)
+- Harmonised both methods that check the inner temperature of thermal house against the boundaries [#880](https://github.com/ie3-institute/simona/issues/880)
 - Prepare ThermalStorageTestData for Storage without storageVolumeLvlMin [#894](https://github.com/ie3-institute/simona/issues/894)
 
 ### Fixed
diff --git a/src/main/scala/edu/ie3/simona/model/thermal/ThermalHouse.scala b/src/main/scala/edu/ie3/simona/model/thermal/ThermalHouse.scala
index 8e3486d5a4..17c7a30ab5 100644
--- a/src/main/scala/edu/ie3/simona/model/thermal/ThermalHouse.scala
+++ b/src/main/scala/edu/ie3/simona/model/thermal/ThermalHouse.scala
@@ -383,10 +383,11 @@ final case class ThermalHouse(
     *   true, if inner temperature is too high
     */
   def isInnerTemperatureTooHigh(
-      innerTemperature: Temperature
+      innerTemperature: Temperature,
+      boundaryTemperature: Temperature = upperBoundaryTemperature,
   ): Boolean =
     innerTemperature > Kelvin(
-      upperBoundaryTemperature.toKelvinScale - temperatureTolerance.toKelvinScale
+      boundaryTemperature.toKelvinScale - temperatureTolerance.toKelvinScale
     )
 
   /** Check if inner temperature is lower than preferred minimum temperature