diff --git a/idm/idm.cpp b/idm/idm.cpp
index cf3156c..26eb2b0 100644
--- a/idm/idm.cpp
+++ b/idm/idm.cpp
@@ -55,10 +55,32 @@ Idm::~Idm()
     }
 }
 
+void Idm::setTargetRoomTemperature (double temperature) {
+    QVector<quint16> registers{};
+
+    printf("Setting target room temperature to %g\n", temperature);
+
+    ModbusHelpers::convertFloatToRegister(registers, temperature);
+
+    printf("registers to be sent: %x %x\n", registers[0], registers[1]);
+    
+    m_modbusMaster->writeHoldingRegisters(Idm::ModbusUnitID, Idm::RoomTemperatureHKA, registers);
+
+    emit targetRoomTemperatureChanged();
+}
+
 void Idm::onReceivedHoldingRegister(int slaveAddress, int modbusRegister, const QVector<quint16> &value)
 {
     Q_UNUSED(slaveAddress);
 
+    /* Introducing a delay here for testing.
+     * Purposely set here, so one delay works for all branches
+     * of the following switch statement. In fact, the delay
+     * is used before evaluating what was just read, which
+     * does not seem to make sense, but it also acts before
+     * the next read command is sent. */
+    QThread::msleep(200);
+
     switch (modbusRegister) {
     case Idm::OutsideTemperature:
         if (value.length() == 2) {
diff --git a/idm/idm.h b/idm/idm.h
index 6d8b28c..d1e0d24 100644
--- a/idm/idm.h
+++ b/idm/idm.h
@@ -47,6 +47,8 @@ public:
     /** Destructor */
     ~Idm();
 
+    void setTargetRoomTemperature (double temperature);
+
 private:
     /* Note: It would be desirable to read the modbus registers
      *       of the Idm heat pump in groups to minimize the number
@@ -153,6 +155,7 @@ private:
 
 signals:
     void statusUpdated(IdmInfo *info);
+    void targetRoomTemperatureChanged();
 
 public slots:
     void onModbusError();
diff --git a/idm/integrationpluginidm.cpp b/idm/integrationpluginidm.cpp
index 472079c..fdcb8be 100644
--- a/idm/integrationpluginidm.cpp
+++ b/idm/integrationpluginidm.cpp
@@ -82,6 +82,7 @@ void IntegrationPluginIdm::postSetupThing(Thing *thing)
         Idm *idm = m_idmConnections.value(thing);
 
         connect(idm, &Idm::statusUpdated, this, &IntegrationPluginIdm::onStatusUpdated);
+        connect(idm, &Idm::targetRoomTemperatureChanged, this, &IntegrationPluginIdm::onTargetRoomTemperatureChanged);
 
         qCDebug(dcIdm()) << "Thing set up, calling update";
         update(thing);
@@ -105,7 +106,13 @@ void IntegrationPluginIdm::executeAction(ThingActionInfo *info)
 
     if (thing->thingClassId() == navigator2ThingClassId) {
       if (action.actionTypeId() == navigator2PowerActionTypeId) {
-        } else {
+          
+      } else if (action.actionTypeId() == navigator2TargetTemperatureStateTypeId) {
+          Idm *idm = m_idmConnections.value(thing);
+
+          idm->setTargetRoomTemperature(action.param(navigator2TargetTemperatureEventTargetTemperatureParamTypeId).value().value<double>());
+
+    } else {
         Q_ASSERT_X(false, "executeAction", QString("Unhandled action: %1").arg(action.actionTypeId().toString()).toUtf8());
         }
     } else {
@@ -160,6 +167,11 @@ void IntegrationPluginIdm::onStatusUpdated(IdmInfo *info)
     thing->setStateValue(navigator2ErrorStateTypeId, info->m_error);
 }
 
+void IntegrationPluginIdm::onTargetRoomTemperatureChanged()
+{
+
+}
+
 void IntegrationPluginIdm::onRefreshTimer()
 {
     foreach (Thing *thing, myThings().filterByThingClassId(navigator2ThingClassId)) {
diff --git a/idm/integrationpluginidm.h b/idm/integrationpluginidm.h
index 81de0e1..5d0cc11 100644
--- a/idm/integrationpluginidm.h
+++ b/idm/integrationpluginidm.h
@@ -89,6 +89,7 @@ private:
 
 private slots:
     void onStatusUpdated(IdmInfo *info);
+    void onTargetRoomTemperatureChanged();
 };
 
 #endif // INTEGRATIONPLUGINIDM_H
diff --git a/idm/integrationpluginidm.json b/idm/integrationpluginidm.json
index 984d7e0..6f8a2e9 100644
--- a/idm/integrationpluginidm.json
+++ b/idm/integrationpluginidm.json
@@ -110,7 +110,7 @@
 
                             "id": "b98fb325-100d-4eae-bf8d-97e8f7e1eb00",
                             "name": "currentPowerConsumptionHeatPump",
-                            "displayName": "Current power consumption heat pump",
+                            "displayName": "Curr. power consumption",
                             "displayNameEvent": "Current power consumption heat pump changed",
                             "displayNameAction": "Change current power consumption het pump",
                             "type": "double",
diff --git a/modbus/modbushelpers.cpp b/modbus/modbushelpers.cpp
index 96b5394..ee26a03 100644
--- a/modbus/modbushelpers.cpp
+++ b/modbus/modbushelpers.cpp
@@ -37,7 +37,7 @@ float ModbusHelpers::convertRegisterToFloat(const quint16 *reg) {
 
     if (reg != nullptr) {
         /* low-order byte is sent first, so swap order */
-        quint32 tmp = 0.0;
+        quint32 tmp = 0;
 
         tmp |= ((quint32)(reg[1]) << 16) & 0xFFFF0000;
         tmp |= reg[0];
@@ -50,3 +50,12 @@ float ModbusHelpers::convertRegisterToFloat(const quint16 *reg) {
     return result;
 }
 
+void ModbusHelpers::convertFloatToRegister(QVector<quint16> &reg, float value) {
+    quint32 tmp = 0;
+
+    memcpy((char *)&tmp, (char *)&value, sizeof(value));
+
+    reg.append((quint16)(tmp));
+    reg.append((quint16)((tmp & 0xFFFF0000) >> 16));
+}
+
diff --git a/modbus/modbushelpers.h b/modbus/modbushelpers.h
index c9e7af2..acea6b8 100644
--- a/modbus/modbushelpers.h
+++ b/modbus/modbushelpers.h
@@ -32,10 +32,12 @@
 #define MODBUSHELPERS_H
 
 #include <QtGlobal>
+#include <QVector>
 
 class ModbusHelpers {
 public:
     static float    convertRegisterToFloat(const quint16 *reg);
+    static void     convertFloatToRegister(QVector<quint16> &reg, float value);
 };
 
 #endif