diff --git a/javasrc/org/hd/d/TRVmodel/hg/HGTRVHPMModelParameterised.java b/javasrc/org/hd/d/TRVmodel/hg/HGTRVHPMModelParameterised.java
index 6db8f2b..c7bee61 100644
--- a/javasrc/org/hd/d/TRVmodel/hg/HGTRVHPMModelParameterised.java
+++ b/javasrc/org/hd/d/TRVmodel/hg/HGTRVHPMModelParameterised.java
@@ -534,10 +534,13 @@ public static DemandWithoutAndWithSetback computeDetachedDemandW(final ModelPara
      *
      * @param params  the variable model parameters
      * @param bungalow  if true, compute as 4-room bungalow, else as 8-room detached
+     * @param equilibriumTemperature  if not null and not zero length,
+     *     used to return the A-room equilibrium temperature
      * @return  demand in watts, finite and non-negative
      */
     public static DemandWithoutAndWithSetback computeSoftATempDemandW(final ModelParameters params,
-    		final boolean bungalow)
+    		final boolean bungalow,
+    		final double[] equilibriumTemperature)
 	    {
     	Objects.requireNonNull(params);
 
@@ -677,6 +680,10 @@ public static DemandWithoutAndWithSetback computeSoftATempDemandW(final ModelPar
         if(VequilibriumHHLsb <= 0)
             { throw new RuntimeException("Failed to find solution"); }
 
+        // Return equilibrium temperature if possible.
+        if((null != equilibriumTemperature) && (0 != equilibriumTemperature.length))
+        	{ equilibriumTemperature[0] = VequilibriumTempA; }
+
         // Compute electrical energy in given non-setback flow temperature CoP.
         final double VHPinWsb =
     		VequilibriumHHLsb / VCoPsb;
diff --git a/test/javasrc/localtest/TestHGTRVHPModelSoftATemperature.java b/test/javasrc/localtest/TestHGTRVHPModelSoftATemperature.java
index 58cc9d4..b48b275 100644
--- a/test/javasrc/localtest/TestHGTRVHPModelSoftATemperature.java
+++ b/test/javasrc/localtest/TestHGTRVHPModelSoftATemperature.java
@@ -16,6 +16,7 @@
 
 package localtest;
 
+import org.hd.d.TRVmodel.hg.HGTRVHPMModel;
 import org.hd.d.TRVmodel.hg.HGTRVHPMModelParameterised;
 import org.hd.d.TRVmodel.hg.HGTRVHPMModelParameterised.DemandWithoutAndWithSetback;
 
@@ -29,7 +30,8 @@ public static void testWithFixParameters()
 	    {
     	final HGTRVHPMModelParameterised.ModelParameters fixParams = HGTRVHPMModelParameterised.ModelParameters.FIXES_APPLIED;
     	final DemandWithoutAndWithSetback originalBungalowDemand = HGTRVHPMModelParameterised.computeBungalowDemandW(fixParams);
-    	final DemandWithoutAndWithSetback softBungalowDemand = HGTRVHPMModelParameterised.computeSoftATempDemandW(fixParams, true);
+    	final double equilibriumTemperature[] = new double[1];
+    	final DemandWithoutAndWithSetback softBungalowDemand = HGTRVHPMModelParameterised.computeSoftATempDemandW(fixParams, true, equilibriumTemperature);
 
     	// Both heat demand and heat-pump electricity demand are expected to be identical to the original
     	// without B rooms set back.
@@ -40,5 +42,10 @@ public static void testWithFixParameters()
     	// when B rooms are set back and A rooms have soft temperature regulation (weather compensation).
     	assertTrue(originalBungalowDemand.withSetback().heatDemand() > softBungalowDemand.withSetback().heatDemand());
     	assertTrue(originalBungalowDemand.withSetback().heatPumpElectricity() > softBungalowDemand.withSetback().heatPumpElectricity());
+
+    	// The A-room equilibrium temperature with B set back
+    	// will be lower than the 'normal' temperature and higher than the setback temperature.
+    	assertTrue(equilibriumTemperature[0] > HGTRVHPMModel.SETBACK_ROOM_TEMPERATURE_C);
+    	assertTrue(equilibriumTemperature[0] < HGTRVHPMModel.NORMAL_ROOM_TEMPERATURE_C);
 	    }
     }