diff --git a/esphome/components/api/api_connection.cpp b/esphome/components/api/api_connection.cpp
index 5b5cb49740..c0dbe4e198 100644
--- a/esphome/components/api/api_connection.cpp
+++ b/esphome/components/api/api_connection.cpp
@@ -112,8 +112,7 @@ void APIConnection::start() {
   APIError err = this->helper_->init();
   if (err != APIError::OK) {
     on_fatal_error();
-    ESP_LOGW(TAG, "%s: Helper init failed %s errno=%d", this->get_client_combined_info().c_str(), api_error_to_str(err),
-             errno);
+    this->log_warning_("Helper init failed", err);
     return;
   }
   this->client_info_.peername = helper_->getpeername();
@@ -144,8 +143,7 @@ void APIConnection::loop() {
   APIError err = this->helper_->loop();
   if (err != APIError::OK) {
     on_fatal_error();
-    ESP_LOGW(TAG, "%s: Socket operation failed %s errno=%d", this->get_client_combined_info().c_str(),
-             api_error_to_str(err), errno);
+    this->log_socket_operation_failed_(err);
     return;
   }
 
@@ -161,8 +159,7 @@ void APIConnection::loop() {
         break;
       } else if (err != APIError::OK) {
         on_fatal_error();
-        ESP_LOGW(TAG, "%s: Reading failed %s errno=%d", this->get_client_combined_info().c_str(), api_error_to_str(err),
-                 errno);
+        this->log_warning_("Reading failed", err);
         return;
       } else {
         this->last_traffic_ = now;
@@ -1540,8 +1537,7 @@ bool APIConnection::try_to_clear_buffer(bool log_out_of_space) {
   APIError err = this->helper_->loop();
   if (err != APIError::OK) {
     on_fatal_error();
-    ESP_LOGW(TAG, "%s: Socket operation failed %s errno=%d", this->get_client_combined_info().c_str(),
-             api_error_to_str(err), errno);
+    this->log_socket_operation_failed_(err);
     return false;
   }
   if (this->helper_->can_write_without_blocking())
@@ -1561,8 +1557,7 @@ bool APIConnection::send_buffer(ProtoWriteBuffer buffer, uint8_t message_type) {
     return false;
   if (err != APIError::OK) {
     on_fatal_error();
-    ESP_LOGW(TAG, "%s: Packet write failed %s errno=%d", this->get_client_combined_info().c_str(),
-             api_error_to_str(err), errno);
+    this->log_warning_("Packet write failed", err);
     return false;
   }
   // Do not set last_traffic_ on send
@@ -1647,6 +1642,8 @@ void APIConnection::process_batch_() {
     return;
   }
 
+  // Get shared buffer reference once to avoid multiple calls
+  auto &shared_buf = this->parent_->get_shared_buffer_ref();
   size_t num_items = this->deferred_batch_.size();
 
   // Fast path for single message - allocate exact size needed
@@ -1657,8 +1654,7 @@ void APIConnection::process_batch_() {
     uint16_t payload_size =
         item.creator(item.entity, this, std::numeric_limits<uint16_t>::max(), true, item.message_type);
 
-    if (payload_size > 0 &&
-        this->send_buffer(ProtoWriteBuffer{&this->parent_->get_shared_buffer_ref()}, item.message_type)) {
+    if (payload_size > 0 && this->send_buffer(ProtoWriteBuffer{&shared_buf}, item.message_type)) {
 #ifdef HAS_PROTO_MESSAGE_DUMP
       // Log messages after send attempt for VV debugging
       // It's safe to use the buffer for logging at this point regardless of send result
@@ -1685,20 +1681,18 @@ void APIConnection::process_batch_() {
   const uint8_t footer_size = this->helper_->frame_footer_size();
 
   // Initialize buffer and tracking variables
-  this->parent_->get_shared_buffer_ref().clear();
+  shared_buf.clear();
 
   // Pre-calculate exact buffer size needed based on message types
-  uint32_t total_estimated_size = 0;
+  uint32_t total_estimated_size = num_items * (header_padding + footer_size);
   for (size_t i = 0; i < this->deferred_batch_.size(); i++) {
     const auto &item = this->deferred_batch_[i];
     total_estimated_size += item.estimated_size;
   }
 
   // Calculate total overhead for all messages
-  uint32_t total_overhead = (header_padding + footer_size) * num_items;
-
   // Reserve based on estimated size (much more accurate than 24-byte worst-case)
-  this->parent_->get_shared_buffer_ref().reserve(total_estimated_size + total_overhead);
+  shared_buf.reserve(total_estimated_size);
   this->flags_.batch_first_message = true;
 
   size_t items_processed = 0;
@@ -1740,7 +1734,7 @@ void APIConnection::process_batch_() {
     remaining_size -= payload_size;
     // Calculate where the next message's header padding will start
     // Current buffer size + footer space (that prepare_message_buffer will add for this message)
-    current_offset = this->parent_->get_shared_buffer_ref().size() + footer_size;
+    current_offset = shared_buf.size() + footer_size;
   }
 
   if (items_processed == 0) {
@@ -1750,17 +1744,15 @@ void APIConnection::process_batch_() {
 
   // Add footer space for the last message (for Noise protocol MAC)
   if (footer_size > 0) {
-    auto &shared_buf = this->parent_->get_shared_buffer_ref();
     shared_buf.resize(shared_buf.size() + footer_size);
   }
 
   // Send all collected packets
-  APIError err = this->helper_->write_protobuf_packets(ProtoWriteBuffer{&this->parent_->get_shared_buffer_ref()},
+  APIError err = this->helper_->write_protobuf_packets(ProtoWriteBuffer{&shared_buf},
                                                        std::span<const PacketInfo>(packet_info, packet_count));
   if (err != APIError::OK && err != APIError::WOULD_BLOCK) {
     on_fatal_error();
-    ESP_LOGW(TAG, "%s: Batch write failed %s errno=%d", this->get_client_combined_info().c_str(), api_error_to_str(err),
-             errno);
+    this->log_warning_("Batch write failed", err);
   }
 
 #ifdef HAS_PROTO_MESSAGE_DUMP
@@ -1838,5 +1830,11 @@ void APIConnection::process_state_subscriptions_() {
 }
 #endif  // USE_API_HOMEASSISTANT_STATES
 
+void APIConnection::log_warning_(const char *message, APIError err) {
+  ESP_LOGW(TAG, "%s: %s %s errno=%d", this->get_client_combined_info().c_str(), message, api_error_to_str(err), errno);
+}
+
+void APIConnection::log_socket_operation_failed_(APIError err) { this->log_warning_("Socket operation failed", err); }
+
 }  // namespace esphome::api
 #endif
diff --git a/esphome/components/api/api_connection.h b/esphome/components/api/api_connection.h
index f57d37f5a5..5b64adecb3 100644
--- a/esphome/components/api/api_connection.h
+++ b/esphome/components/api/api_connection.h
@@ -736,6 +736,11 @@ class APIConnection : public APIServerConnection {
     this->deferred_batch_.add_item_front(entity, MessageCreator(function_ptr), message_type, estimated_size);
     return this->schedule_batch_();
   }
+
+  // Helper function to log API errors with errno
+  void log_warning_(const char *message, APIError err);
+  // Specific helper for duplicated error message
+  void log_socket_operation_failed_(APIError err);
 };
 
 }  // namespace esphome::api