diff --git a/src/roomcontrol.cpp b/src/roomcontrol.cpp
index a476d287..a540cf40 100644
--- a/src/roomcontrol.cpp
+++ b/src/roomcontrol.cpp
@@ -20,35 +20,43 @@
 
 namespace emsesp {
 
-static uint32_t rc_time_      = 0;
-static int16_t  remotetemp[4] = {EMS_VALUE_SHORT_NOTSET, EMS_VALUE_SHORT_NOTSET, EMS_VALUE_SHORT_NOTSET, EMS_VALUE_SHORT_NOTSET};
+// init statics
+bool     Roomctrl::switch_off_[HCS] = {false, false, false, false};
+uint32_t Roomctrl::rc_time_[HCS]    = {0, 0, 0, 0};
+int16_t  Roomctrl::remotetemp_[HCS] = {EMS_VALUE_SHORT_NOTSET, EMS_VALUE_SHORT_NOTSET, EMS_VALUE_SHORT_NOTSET, EMS_VALUE_SHORT_NOTSET};
 
 /**
  * set the temperature,
  */
 void Roomctrl::set_remotetemp(const uint8_t hc, const int16_t temp) {
-    if (hc > 3) {
+    if (hc >= HCS) {
         return;
     }
-    remotetemp[hc] = temp;
+    if (remotetemp_[hc] != EMS_VALUE_SHORT_NOTSET && temp == EMS_VALUE_SHORT_NOTSET) {
+        switch_off_[hc] = true;
+    }
+    remotetemp_[hc] = temp;
 }
 
 /**
  * if remote control is active send the temperature every minute
  */
 void Roomctrl::send(const uint8_t addr) {
-    uint8_t hc_ = addr - ADDR;
+    uint8_t hc = addr - ADDR;
     // check address, reply only on addresses 0x18..0x1B
-    if (hc_ > 3) {
+    if (hc >= HCS) {
         return;
     }
     // no reply if the temperature is not set
-    if (remotetemp[hc_] == EMS_VALUE_SHORT_NOTSET) {
+    if (remotetemp_[hc] == EMS_VALUE_SHORT_NOTSET && !switch_off_[hc]) {
         return;
     }
-    if (uuid::get_uptime() - rc_time_ > SEND_INTERVAL) { // send every minute
-        rc_time_ = uuid::get_uptime();                   // use EMS-ESP's millis() to prevent overhead
-        temperature(addr, 0x00);                         // send to all
+
+    // send roomtemp to all every minute
+    if (uuid::get_uptime() - rc_time_[hc] > SEND_INTERVAL || switch_off_[hc]) {
+        rc_time_[hc] = uuid::get_uptime();
+        temperature(addr, 0x00);
+        switch_off_[hc] = false;
     } else {
         // acknowledge every poll, otherwise the master shows error A22-816
         EMSuart::send_poll(addr);
@@ -59,14 +67,14 @@ void Roomctrl::send(const uint8_t addr) {
  * check if there is a message for the remote room controller
  */
 void Roomctrl::check(const uint8_t addr, const uint8_t * data) {
-    uint8_t hc_ = (addr & 0x7F) - ADDR;
+    uint8_t hc = (addr & 0x7F) - ADDR;
 
     // check address, reply only on addresses 0x18..0x1B
-    if (hc_ > 3) {
+    if (hc >= HCS) {
         return;
     }
     // no reply if the temperature is not set
-    if (remotetemp[hc_] == EMS_VALUE_SHORT_NOTSET) {
+    if (remotetemp_[hc] == EMS_VALUE_SHORT_NOTSET) {
         return;
     }
     // reply to writes with write nack byte
@@ -78,7 +86,7 @@ void Roomctrl::check(const uint8_t addr, const uint8_t * data) {
     // empty message back if temperature not set or unknown message type
     if (data[2] == 0x02) {
         version(addr, data[0]);
-    } else if (remotetemp[hc_] == EMS_VALUE_SHORT_NOTSET) {
+    } else if (remotetemp_[hc] == EMS_VALUE_SHORT_NOTSET) {
         unknown(addr, data[0], data[2], data[3]);
     } else if (data[2] == 0xAF && data[3] == 0) {
         temperature(addr, data[0]);
@@ -121,15 +129,15 @@ void Roomctrl::unknown(uint8_t addr, uint8_t dst, uint8_t type, uint8_t offset)
  */
 void Roomctrl::temperature(uint8_t addr, uint8_t dst) {
     uint8_t data[10];
-    uint8_t hc_ = addr - ADDR;
-    data[0]     = addr;
-    data[1]     = dst;
-    data[2]     = 0xAF;
-    data[3]     = 0;
-    data[4]     = (uint8_t)(remotetemp[hc_] >> 8);
-    data[5]     = (uint8_t)(remotetemp[hc_] & 0xFF);
-    data[6]     = 0;
-    data[7]     = EMSbus::calculate_crc(data, 7); // apppend CRC
+    uint8_t hc = addr - ADDR;
+    data[0]    = addr;
+    data[1]    = dst;
+    data[2]    = 0xAF;
+    data[3]    = 0;
+    data[4]    = (uint8_t)(remotetemp_[hc] >> 8);
+    data[5]    = (uint8_t)(remotetemp_[hc] & 0xFF);
+    data[6]    = 0;
+    data[7]    = EMSbus::calculate_crc(data, 7); // apppend CRC
     EMSuart::transmit(data, 8);
 }
 /**
diff --git a/src/roomcontrol.h b/src/roomcontrol.h
index b332f916..8d034b8d 100644
--- a/src/roomcontrol.h
+++ b/src/roomcontrol.h
@@ -32,11 +32,17 @@ class Roomctrl {
   private:
     static constexpr uint8_t  ADDR          = 0x18;
     static constexpr uint32_t SEND_INTERVAL = 60000; // 1 minute
+    static constexpr uint8_t  HCS           = 4;     // max 4 heating circuits
 
     static void version(uint8_t addr, uint8_t dst);
     static void unknown(uint8_t addr, uint8_t dst, uint8_t type, uint8_t offset);
     static void temperature(uint8_t addr, uint8_t dst);
     static void nack_write();
+
+    static bool     switch_off_[HCS];
+    static uint32_t rc_time_[HCS];
+    static int16_t  remotetemp_[HCS];
+
 };
 
 } // namespace emsesp