diff --git a/esphome/components/airton/airton.cpp b/esphome/components/airton/airton.cpp
index a2a658443a..2e13dc3d5c 100644
--- a/esphome/components/airton/airton.cpp
+++ b/esphome/components/airton/airton.cpp
@@ -5,7 +5,10 @@ namespace esphome {
 namespace airton {
 
 static const char *const TAG = "airton.climate";
-uint8_t previous_mode_ = 0;
+
+uint8_t AirtonClimate::get_previous_mode_() { return previous_mode_; }
+
+void AirtonClimate::set_previous_mode_(uint8_t mode) { previous_mode_ = mode; }
 
 void AirtonClimate::transmit_state() {
   // Sampled valid state
@@ -81,9 +84,9 @@ uint8_t AirtonClimate::operation_mode_() {
       break;
     case climate::CLIMATE_MODE_OFF:
     default:
-      operating_mode = 0b0111 & this->previous_mode_;  // Set previous mode with power state bit off
+      operating_mode = 0b0111 & this->get_previous_mode_();  // Set previous mode with power state bit off
   }
-  this->previous_mode_ = operating_mode;
+  this->set_previous_mode_(operating_mode);
   return operating_mode;
 }
 
@@ -161,7 +164,7 @@ uint8_t AirtonClimate::checksum_(const uint8_t *r_state) {
   return checksum;
 }
 
-bool AirtonClimate::parse_state_frame_(uint8_t frame[]) {
+bool AirtonClimate::parse_state_frame_(uint8_t const frame[]) {
   uint8_t mode = frame[2];
   if (mode & 0b00001000) {        // Check if power state bit is set
     switch (mode & 0b00000111) {  // Mask anything but the least significant 3 bits
diff --git a/esphome/components/airton/airton.h b/esphome/components/airton/airton.h
index f8ddc43370..98832e9719 100644
--- a/esphome/components/airton/airton.h
+++ b/esphome/components/airton/airton.h
@@ -45,10 +45,14 @@ class AirtonClimate : public climate_ir::ClimateIR {
                                climate::CLIMATE_FAN_HIGH},
                               {climate::CLIMATE_SWING_OFF, climate::CLIMATE_SWING_VERTICAL}) {}
 
- protected:
-  // Save the previous operation mode globally
+ private:
+  // Save the previous operation mode inside instance
   uint8_t previous_mode_;
 
+ protected:
+  uint8_t get_previous_mode_();
+  void set_previous_mode_(uint8_t mode);
+
   // IR transmission payload builder
   void transmit_state() override;
 
@@ -64,7 +68,7 @@ class AirtonClimate : public climate_ir::ClimateIR {
 
   // IR receiver buffer
   bool on_receive(remote_base::RemoteReceiveData data) override;
-  bool parse_state_frame_(uint8_t frame[]);
+  bool parse_state_frame_(uint8_t const frame[]);
 };
 
 }  // namespace airton