From 1560b8b8e25907a36fb95fdd425a6acb24c90651 Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@koston.org>
Date: Thu, 25 Sep 2025 19:19:48 -0500
Subject: [PATCH] [climate] Remove STL algorithm overhead in save_state()
 method (#10888)

---
 esphome/components/climate/climate.cpp | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/esphome/components/climate/climate.cpp b/esphome/components/climate/climate.cpp
index be56310b35..e7a454d459 100644
--- a/esphome/components/climate/climate.cpp
+++ b/esphome/components/climate/climate.cpp
@@ -367,9 +367,11 @@ void Climate::save_state_() {
     state.uses_custom_fan_mode = true;
     const auto &supported = traits.get_supported_custom_fan_modes();
     std::vector<std::string> vec{supported.begin(), supported.end()};
-    auto it = std::find(vec.begin(), vec.end(), custom_fan_mode);
-    if (it != vec.end()) {
-      state.custom_fan_mode = std::distance(vec.begin(), it);
+    for (size_t i = 0; i < vec.size(); i++) {
+      if (vec[i] == custom_fan_mode) {
+        state.custom_fan_mode = i;
+        break;
+      }
     }
   }
   if (traits.get_supports_presets() && preset.has_value()) {
@@ -380,10 +382,11 @@ void Climate::save_state_() {
     state.uses_custom_preset = true;
     const auto &supported = traits.get_supported_custom_presets();
     std::vector<std::string> vec{supported.begin(), supported.end()};
-    auto it = std::find(vec.begin(), vec.end(), custom_preset);
-    // only set custom preset if value exists, otherwise leave it as is
-    if (it != vec.cend()) {
-      state.custom_preset = std::distance(vec.begin(), it);
+    for (size_t i = 0; i < vec.size(); i++) {
+      if (vec[i] == custom_preset) {
+        state.custom_preset = i;
+        break;
+      }
     }
   }
   if (traits.get_supports_swing_modes()) {