diff --git a/CHANGELOG.md b/CHANGELOG.md
index c4030aa839..681b04b5dd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -80,6 +80,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Updated AUTHORS.md [#905](https://github.com/ie3-institute/simona/issues/905)
 - Rewrote BMModelTest from groovy to scala [#646](https://github.com/ie3-institute/simona/issues/646)
 - Refactoring EM messages [#947](https://github.com/ie3-institute/simona/issues/947)
+- Simplifying ThermalHouse [#940](https://github.com/ie3-institute/simona/issues/940)
 
 ### Fixed
 - Removed a repeated line in the documentation of vn_simona config [#658](https://github.com/ie3-institute/simona/issues/658)
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 547a639d08..71e992c4e0 100644
--- a/src/main/scala/edu/ie3/simona/model/thermal/ThermalHouse.scala
+++ b/src/main/scala/edu/ie3/simona/model/thermal/ThermalHouse.scala
@@ -199,100 +199,22 @@ final case class ThermalHouse(
       currentInnerTemperature: Temperature,
       ambientTemperature: Temperature,
   ): Temperature = {
-    val thermalEnergyChange = calcThermalEnergyChange(
-      calcThermalEnergyGain(thermalPower, duration),
-      calcThermalEnergyLoss(
-        currentInnerTemperature,
-        ambientTemperature,
-        duration,
-      ),
-    )
-    calcNewInnerTemperature(
+    val thermalEnergyGain = thermalPower * duration
+
+    // thermal energy loss due to the deviation between outside and inside temperature
+    val thermalEnergyLoss = ethLosses.calcThermalEnergyChange(
       currentInnerTemperature,
-      calcInnerTemperatureChange(thermalEnergyChange),
+      ambientTemperature,
+      duration,
     )
-  }
 
-  /** Calculate the new inner temperature of the thermal house
-    *
-    * @param oldInnerTemperature
-    *   previous inner temperature
-    * @param temperatureChange
-    *   temperature change
-    * @return
-    *   new inner temperature
-    */
-  def calcNewInnerTemperature(
-      oldInnerTemperature: Temperature,
-      temperatureChange: Temperature,
-  ): Temperature =
-    oldInnerTemperature + temperatureChange
+    val energyChange = thermalEnergyGain - thermalEnergyLoss
 
-  /** Calculate the temperature change for the thermal house form the thermal
-    * energy change
-    *
-    * @param thermalEnergyChange
-    *   thermal energy change (e.g. through heat pump)
-    * @return
-    *   temperature change
-    */
-  def calcInnerTemperatureChange(
-      thermalEnergyChange: Energy
-  ): Temperature = {
-    thermalEnergyChange / ethCapa
-  }
-
-  /** Calculate the thermal energy change combining the added and lost energy
-    *
-    * @param thermalEnergyGain
-    *   thermal energy added
-    * @param thermalEnergyLoss
-    *   thermal energy lost
-    * @return
-    *   thermal energy change
-    */
-  def calcThermalEnergyChange(
-      thermalEnergyGain: Energy,
-      thermalEnergyLoss: Energy,
-  ): Energy =
-    thermalEnergyGain - thermalEnergyLoss
+    // temperature change calculated from energy change(WattHours) and thermal capacity(Joules per Kelvin)
+    val temperatureChange = energyChange / ethCapa
 
-  /** Calculate the thermal energy gain, e.g. due to a running heat pump
-    *
-    * @param pThermal
-    *   added thermal power (e.g. of heat pump)
-    * @param time
-    *   time step length in which thermal power is added
-    * @return
-    *   resulting thermal energy gain
-    */
-  def calcThermalEnergyGain(
-      pThermal: Power,
-      time: Time,
-  ): Energy = pThermal * time
-
-  /** Calculate the thermal energy loss due to the temperature deviation over
-    * the time step
-    *
-    * @param innerTemperature
-    *   previous inner temperature
-    * @param ambientTemperature
-    *   ambient temperature of thermal house
-    * @param time
-    *   time step length
-    * @return
-    *   resulting thermal energy loss
-    */
-  def calcThermalEnergyLoss(
-      innerTemperature: Temperature,
-      ambientTemperature: Temperature,
-      time: Time,
-  ): Energy = {
-    ethLosses.thermalConductanceToEnergy(
-      innerTemperature,
-      ambientTemperature,
-      time,
-    )
+    // return value new inner temperature
+    currentInnerTemperature + temperatureChange
   }
 
   /** Update the current state of the house
@@ -358,7 +280,7 @@ final case class ThermalHouse(
       ambientTemperature: Temperature,
   ): Option[ThermalThreshold] = {
     val artificialDuration = Hours(1d)
-    val loss = calcThermalEnergyLoss(
+    val loss = ethLosses.calcThermalEnergyChange(
       innerTemperature,
       ambientTemperature,
       artificialDuration,
diff --git a/src/main/scala/edu/ie3/util/scala/quantities/ThermalConductance.scala b/src/main/scala/edu/ie3/util/scala/quantities/ThermalConductance.scala
index ce8f9d4293..a5fa7648c4 100644
--- a/src/main/scala/edu/ie3/util/scala/quantities/ThermalConductance.scala
+++ b/src/main/scala/edu/ie3/util/scala/quantities/ThermalConductance.scala
@@ -33,7 +33,7 @@ final class ThermalConductance private (
     *   Time duration
     * @return
     */
-  def thermalConductanceToEnergy(
+  def calcThermalEnergyChange(
       temperatureInner: Temperature,
       temperatureOuter: Temperature,
       time: squants.Time,
diff --git a/src/test/scala/edu/ie3/simona/model/thermal/ThermalHouseSpec.scala b/src/test/scala/edu/ie3/simona/model/thermal/ThermalHouseSpec.scala
index 20131046bf..0a967553e2 100644
--- a/src/test/scala/edu/ie3/simona/model/thermal/ThermalHouseSpec.scala
+++ b/src/test/scala/edu/ie3/simona/model/thermal/ThermalHouseSpec.scala
@@ -52,35 +52,6 @@ class ThermalHouseSpec extends UnitSpec with HpInputTestData {
       }
     }
 
-    "Calculation of thermal energy change and new inner temperature is performed correctly" in {
-      val thermalHouseTest = thermalHouse(18, 22)
-      val innerTemperature = Temperature(20, Celsius)
-
-      val thermalEnergyGain =
-        thermalHouseTest.calcThermalEnergyGain(Kilowatts(100), Seconds(3600))
-      val thermalEnergyLoss = thermalHouseTest.calcThermalEnergyLoss(
-        innerTemperature,
-        Temperature(10, Celsius),
-        Seconds(3600),
-      )
-      val thermalEnergyChange = thermalHouseTest.calcThermalEnergyChange(
-        thermalEnergyGain,
-        thermalEnergyLoss,
-      )
-      val innerTemperatureChange =
-        thermalHouseTest.calcInnerTemperatureChange(thermalEnergyChange)
-      val newInnerTemperature = thermalHouseTest.calcNewInnerTemperature(
-        innerTemperature,
-        innerTemperatureChange,
-      )
-
-      thermalEnergyGain should approximate(KilowattHours(100))
-      thermalEnergyLoss should approximate(KilowattHours(10))
-      thermalEnergyChange should approximate(KilowattHours(90))
-      innerTemperatureChange should approximate(Kelvin(9.0))
-      newInnerTemperature should approximate(Celsius(29.0))
-    }
-
     "Comprising function to calculate new inner temperature works as expected" in {
       val thermalHouseTest = thermalHouse(18, 22)
       val thermalPower = Kilowatts(100)
diff --git a/src/test/scala/edu/ie3/util/quantities/ThermalConductanceSpec.scala b/src/test/scala/edu/ie3/util/quantities/ThermalConductanceSpec.scala
index 7b71137d69..9b54c25a81 100644
--- a/src/test/scala/edu/ie3/util/quantities/ThermalConductanceSpec.scala
+++ b/src/test/scala/edu/ie3/util/quantities/ThermalConductanceSpec.scala
@@ -33,7 +33,7 @@ class ThermalConductanceSpec extends AnyFlatSpec with Matchers {
   }
 
   it should "return Energy when multiplied by Temperature in Kelvin and Time" in {
-    WattsPerKelvin(1000).thermalConductanceToEnergy(
+    WattsPerKelvin(1000).calcThermalEnergyChange(
       Kelvin(10),
       Kelvin(0),
       Hours(5),
@@ -41,7 +41,7 @@ class ThermalConductanceSpec extends AnyFlatSpec with Matchers {
   }
 
   it should "return Energy when multiplied by Temperature in Celsius and Time" in {
-    WattsPerKelvin(1000).thermalConductanceToEnergy(
+    WattsPerKelvin(1000).calcThermalEnergyChange(
       Celsius(10),
       Celsius(0),
       Hours(5),