diff --git a/esphome/components/climate/climate_mode_bitmask.h b/esphome/components/climate/climate_mode_bitmask.h
index 4166829c3f..d04e7b6ec7 100644
--- a/esphome/components/climate/climate_mode_bitmask.h
+++ b/esphome/components/climate/climate_mode_bitmask.h
@@ -3,8 +3,7 @@
 #include "esphome/core/enum_bitmask.h"
 #include "climate_mode.h"
 
-namespace esphome {
-namespace climate {
+namespace esphome::climate {
 
 // Type aliases for climate enum bitmasks
 // These replace std::set<EnumType> to eliminate red-black tree overhead
@@ -21,8 +20,7 @@ using ClimateFanModeMask = EnumBitmask<ClimateFanMode, CLIMATE_FAN_MODE_BITMASK_
 using ClimateSwingModeMask = EnumBitmask<ClimateSwingMode, CLIMATE_SWING_MODE_BITMASK_SIZE>;
 using ClimatePresetMask = EnumBitmask<ClimatePreset, CLIMATE_PRESET_BITMASK_SIZE>;
 
-}  // namespace climate
-}  // namespace esphome
+}  // namespace esphome::climate
 
 // Template specializations for enum-to-bit conversions
 // All climate enums are sequential starting from 0, so conversions are trivial
diff --git a/esphome/components/climate/climate_traits.h b/esphome/components/climate/climate_traits.h
index 238c527981..1aef00956b 100644
--- a/esphome/components/climate/climate_traits.h
+++ b/esphome/components/climate/climate_traits.h
@@ -5,8 +5,7 @@
 #include "climate_mode_bitmask.h"
 #include "esphome/core/helpers.h"
 
-namespace esphome {
-namespace climate {
+namespace esphome::climate {
 
 // Lightweight linear search for small vectors (1-20 items)
 // Avoids std::find template overhead
@@ -18,8 +17,7 @@ template<typename T> inline bool vector_contains(const std::vector<T> &vec, cons
   return false;
 }
 
-}  // namespace climate
-}  // namespace esphome
+}  // namespace esphome::climate
 
 namespace esphome {