diff --git a/components/truma_inetbox/TrumaEnums.h b/components/truma_inetbox/TrumaEnums.h
index e33336f..6811942 100644
--- a/components/truma_inetbox/TrumaEnums.h
+++ b/components/truma_inetbox/TrumaEnums.h
@@ -139,9 +139,15 @@ enum class ClockSource : u_int8_t {
   CLOCK_SOURCE_PROG = 0x2,
 };
 
+enum class TRUMA_COMPANY : u_int8_t {
+  UNKNOWN = 0x00,
+  TRUMA = 0x1E,
+  ALDE = 0x1A,
+};
+
 enum class TRUMA_DEVICE : u_int8_t {
   UNKNOWN = 0x00,
-  
+
   // Saphir Compact AC
   AIRCON_DEVICE = 0x01,
 
@@ -160,7 +166,7 @@ enum class TRUMA_DEVICE : u_int8_t {
   HEATER_COMBI6D = 0x06,
 };
 
-enum class TRUMA_DEVICE_STATE : u_int8_t{
+enum class TRUMA_DEVICE_STATE : u_int8_t {
   OFFLINE = 0x00,
   ONLINE = 0x01,
 };
diff --git a/components/truma_inetbox/TrumaiNetBoxApp.cpp b/components/truma_inetbox/TrumaiNetBoxApp.cpp
index b2fad32..976f489 100644
--- a/components/truma_inetbox/TrumaiNetBoxApp.cpp
+++ b/components/truma_inetbox/TrumaiNetBoxApp.cpp
@@ -133,10 +133,14 @@ const u_int8_t *TrumaiNetBoxApp::lin_multiframe_recieved(const u_int8_t *message
     return nullptr;
   }
   for (u_int8_t i = 1; i < truma_message_header.size() - 3; i++) {
-    if (message[i] != truma_message_header[i]) {
+    if (message[i] != truma_message_header[i] && message[i] != alde_message_header[i]) {
       return nullptr;
     }
   }
+  if (message[4] != (u_int8_t) this->company_) {
+    ESP_LOGI(TAG, "Switch company to 0x%02x", message[4]);
+    this->company_ = (TRUMA_COMPANY) message[4];
+  }
 
   if (message[0] == LIN_SID_READ_STATE_BUFFER) {
     // Example: BA.00.1F.00.1E.00.00.22.FF.FF.FF (11)
diff --git a/components/truma_inetbox/TrumaiNetBoxApp.h b/components/truma_inetbox/TrumaiNetBoxApp.h
index 68ec6c9..19c1860 100644
--- a/components/truma_inetbox/TrumaiNetBoxApp.h
+++ b/components/truma_inetbox/TrumaiNetBoxApp.h
@@ -52,6 +52,7 @@ class TrumaiNetBoxApp : public LinBusProtocol {
   u_int8_t message_counter = 1;
 
   // Truma heater conected to CP Plus.
+  TRUMA_COMPANY company_ = TRUMA_COMPANY::TRUMA;
   TRUMA_DEVICE heater_device_ = TRUMA_DEVICE::UNKNOWN;
   TRUMA_DEVICE aircon_device_ = TRUMA_DEVICE::UNKNOWN;
 
diff --git a/components/truma_inetbox/helpers.h b/components/truma_inetbox/helpers.h
index 35ccaba..fad927c 100644
--- a/components/truma_inetbox/helpers.h
+++ b/components/truma_inetbox/helpers.h
@@ -5,9 +5,12 @@
 
 namespace esphome {
 namespace truma_inetbox {
-// First byte is service identifier and to be ignored. Last three bytes can be `xFF` or `x00` (see <https://github.com/Fabian-Schmidt/esphome-truma_inetbox/issues/25>).
+// First byte is service identifier and to be ignored. Last three bytes can be `xFF` or `x00` (see
+// <https://github.com/Fabian-Schmidt/esphome-truma_inetbox/issues/25>).
+// `truma_message_header` and `alde_message_header` must have the same size!
 const std::array<u_int8_t, 11> truma_message_header = {0x00, 0x00, 0x1F, 0x00, 0x1E, 0x00,
                                                        0x00, 0x22, 0xFF, 0xFF, 0xFF};
+const std::array<u_int8_t, 11> alde_message_header = {0x00, 0x00, 0x1F, 0x00, 0x1A, 0x00, 0x00, 0x22, 0xFF, 0xFF, 0xFF};
 
 u_int8_t addr_parity(const u_int8_t pid);
 u_int8_t data_checksum(const u_int8_t *message, u_int8_t length, uint16_t sum);