diff --git a/components/samsung_ac/protocol.h b/components/samsung_ac/protocol.h
index ffd433cc..c848cff9 100644
--- a/components/samsung_ac/protocol.h
+++ b/components/samsung_ac/protocol.h
@@ -83,6 +83,7 @@ namespace esphome
             optional<bool> power;
             optional<Mode> mode;
             optional<SwingMode> swing_mode;
+            optional<AltMode> alt_mode;
         };
 
         class Protocol
diff --git a/components/samsung_ac/protocol_nasa.cpp b/components/samsung_ac/protocol_nasa.cpp
index 29aaa10f..c8333b93 100644
--- a/components/samsung_ac/protocol_nasa.cpp
+++ b/components/samsung_ac/protocol_nasa.cpp
@@ -459,6 +459,13 @@ namespace esphome
                 packet.messages.push_back(power);
             }
 
+            if (request.alt_mode)
+            {
+                MessageSet altmode(MessageNumber::ENUM_in_alt_mode);
+                altmode.value = altmode_to_nasa_altmode(request.alt_mode.value());
+                packet.messages.push_back(altmode);
+            }
+
             if (request.swing_mode)
             {
                 MessageSet hl_swing(MessageNumber::ENUM_in_louver_hl_swing);