diff --git a/esphome/components/fujitsu_general/fujitsu_general.cpp b/esphome/components/fujitsu_general/fujitsu_general.cpp
index f801239153..aca643defe 100644
--- a/esphome/components/fujitsu_general/fujitsu_general.cpp
+++ b/esphome/components/fujitsu_general/fujitsu_general.cpp
@@ -11,78 +11,78 @@ namespace esphome::fujitsu_general {
 static const char *const TAG = "fujitsu_general.climate";
 
 // Common header
-const uint8_t FUJITSU_GENERAL_COMMON_LENGTH = 6;
-const uint8_t FUJITSU_GENERAL_COMMON_BYTE0 = 0x14;
-const uint8_t FUJITSU_GENERAL_COMMON_BYTE1 = 0x63;
-const uint8_t FUJITSU_GENERAL_COMMON_BYTE2 = 0x00;
-const uint8_t FUJITSU_GENERAL_COMMON_BYTE3 = 0x10;
-const uint8_t FUJITSU_GENERAL_COMMON_BYTE4 = 0x10;
-const uint8_t FUJITSU_GENERAL_MESSAGE_TYPE_BYTE = 5;
+constexpr uint8_t FUJITSU_GENERAL_COMMON_LENGTH = 6;
+constexpr uint8_t FUJITSU_GENERAL_COMMON_BYTE0 = 0x14;
+constexpr uint8_t FUJITSU_GENERAL_COMMON_BYTE1 = 0x63;
+constexpr uint8_t FUJITSU_GENERAL_COMMON_BYTE2 = 0x00;
+constexpr uint8_t FUJITSU_GENERAL_COMMON_BYTE3 = 0x10;
+constexpr uint8_t FUJITSU_GENERAL_COMMON_BYTE4 = 0x10;
+constexpr uint8_t FUJITSU_GENERAL_MESSAGE_TYPE_BYTE = 5;
 
 // State message - temp & fan etc.
-const uint8_t FUJITSU_GENERAL_STATE_MESSAGE_LENGTH = 16;
-const uint8_t FUJITSU_GENERAL_MESSAGE_TYPE_STATE = 0xFE;
+constexpr uint8_t FUJITSU_GENERAL_STATE_MESSAGE_LENGTH = 16;
+constexpr uint8_t FUJITSU_GENERAL_MESSAGE_TYPE_STATE = 0xFE;
 
 // Util messages - off & eco etc.
-const uint8_t FUJITSU_GENERAL_UTIL_MESSAGE_LENGTH = 7;
-const uint8_t FUJITSU_GENERAL_MESSAGE_TYPE_OFF = 0x02;
-const uint8_t FUJITSU_GENERAL_MESSAGE_TYPE_ECONOMY = 0x09;
-const uint8_t FUJITSU_GENERAL_MESSAGE_TYPE_NUDGE = 0x6C;
+constexpr uint8_t FUJITSU_GENERAL_UTIL_MESSAGE_LENGTH = 7;
+constexpr uint8_t FUJITSU_GENERAL_MESSAGE_TYPE_OFF = 0x02;
+constexpr uint8_t FUJITSU_GENERAL_MESSAGE_TYPE_ECONOMY = 0x09;
+constexpr uint8_t FUJITSU_GENERAL_MESSAGE_TYPE_NUDGE = 0x6C;
 
 // State header
-const uint8_t FUJITSU_GENERAL_STATE_HEADER_BYTE0 = 0x09;
-const uint8_t FUJITSU_GENERAL_STATE_HEADER_BYTE1 = 0x30;
+constexpr uint8_t FUJITSU_GENERAL_STATE_HEADER_BYTE0 = 0x09;
+constexpr uint8_t FUJITSU_GENERAL_STATE_HEADER_BYTE1 = 0x30;
 
 // State footer
-const uint8_t FUJITSU_GENERAL_STATE_FOOTER_BYTE0 = 0x20;
+constexpr uint8_t FUJITSU_GENERAL_STATE_FOOTER_BYTE0 = 0x20;
 
 // Temperature
-const uint8_t FUJITSU_GENERAL_TEMPERATURE_NIBBLE = 16;
+constexpr uint8_t FUJITSU_GENERAL_TEMPERATURE_NIBBLE = 16;
 
 // Power on
-const uint8_t FUJITSU_GENERAL_POWER_ON_NIBBLE = 17;
-const uint8_t FUJITSU_GENERAL_POWER_OFF = 0x00;
-const uint8_t FUJITSU_GENERAL_POWER_ON = 0x01;
+constexpr uint8_t FUJITSU_GENERAL_POWER_ON_NIBBLE = 17;
+constexpr uint8_t FUJITSU_GENERAL_POWER_OFF = 0x00;
+constexpr uint8_t FUJITSU_GENERAL_POWER_ON = 0x01;
 
 // Mode
-const uint8_t FUJITSU_GENERAL_MODE_NIBBLE = 19;
-const uint8_t FUJITSU_GENERAL_MODE_AUTO = 0x00;
-const uint8_t FUJITSU_GENERAL_MODE_COOL = 0x01;
-const uint8_t FUJITSU_GENERAL_MODE_DRY = 0x02;
-const uint8_t FUJITSU_GENERAL_MODE_FAN = 0x03;
-const uint8_t FUJITSU_GENERAL_MODE_HEAT = 0x04;
+constexpr uint8_t FUJITSU_GENERAL_MODE_NIBBLE = 19;
+constexpr uint8_t FUJITSU_GENERAL_MODE_AUTO = 0x00;
+constexpr uint8_t FUJITSU_GENERAL_MODE_COOL = 0x01;
+constexpr uint8_t FUJITSU_GENERAL_MODE_DRY = 0x02;
+constexpr uint8_t FUJITSU_GENERAL_MODE_FAN = 0x03;
+constexpr uint8_t FUJITSU_GENERAL_MODE_HEAT = 0x04;
 // const uint8_t FUJITSU_GENERAL_MODE_10C = 0x0B;
 
 // Swing
-const uint8_t FUJITSU_GENERAL_SWING_NIBBLE = 20;
-const uint8_t FUJITSU_GENERAL_SWING_NONE = 0x00;
-const uint8_t FUJITSU_GENERAL_SWING_VERTICAL = 0x01;
-const uint8_t FUJITSU_GENERAL_SWING_HORIZONTAL = 0x02;
-const uint8_t FUJITSU_GENERAL_SWING_BOTH = 0x03;
+constexpr uint8_t FUJITSU_GENERAL_SWING_NIBBLE = 20;
+constexpr uint8_t FUJITSU_GENERAL_SWING_NONE = 0x00;
+constexpr uint8_t FUJITSU_GENERAL_SWING_VERTICAL = 0x01;
+constexpr uint8_t FUJITSU_GENERAL_SWING_HORIZONTAL = 0x02;
+constexpr uint8_t FUJITSU_GENERAL_SWING_BOTH = 0x03;
 
 // Fan
-const uint8_t FUJITSU_GENERAL_FAN_NIBBLE = 21;
-const uint8_t FUJITSU_GENERAL_FAN_AUTO = 0x00;
-const uint8_t FUJITSU_GENERAL_FAN_HIGH = 0x01;
-const uint8_t FUJITSU_GENERAL_FAN_MEDIUM = 0x02;
-const uint8_t FUJITSU_GENERAL_FAN_LOW = 0x03;
-const uint8_t FUJITSU_GENERAL_FAN_SILENT = 0x04;
+constexpr uint8_t FUJITSU_GENERAL_FAN_NIBBLE = 21;
+constexpr uint8_t FUJITSU_GENERAL_FAN_AUTO = 0x00;
+constexpr uint8_t FUJITSU_GENERAL_FAN_HIGH = 0x01;
+constexpr uint8_t FUJITSU_GENERAL_FAN_MEDIUM = 0x02;
+constexpr uint8_t FUJITSU_GENERAL_FAN_LOW = 0x03;
+constexpr uint8_t FUJITSU_GENERAL_FAN_SILENT = 0x04;
 
 // TODO Outdoor Unit Low Noise
 // const uint8_t FUJITSU_GENERAL_OUTDOOR_UNIT_LOW_NOISE_BYTE14 = 0xA0;
 // const uint8_t FUJITSU_GENERAL_STATE_BYTE14 = 0x20;
 
-const uint16_t FUJITSU_GENERAL_HEADER_MARK = 3300;
-const uint16_t FUJITSU_GENERAL_HEADER_SPACE = 1600;
+constexpr uint16_t FUJITSU_GENERAL_HEADER_MARK = 3300;
+constexpr uint16_t FUJITSU_GENERAL_HEADER_SPACE = 1600;
 
-const uint16_t FUJITSU_GENERAL_BIT_MARK = 420;
-const uint16_t FUJITSU_GENERAL_ONE_SPACE = 1200;
-const uint16_t FUJITSU_GENERAL_ZERO_SPACE = 420;
+constexpr uint16_t FUJITSU_GENERAL_BIT_MARK = 420;
+constexpr uint16_t FUJITSU_GENERAL_ONE_SPACE = 1200;
+constexpr uint16_t FUJITSU_GENERAL_ZERO_SPACE = 420;
 
-const uint16_t FUJITSU_GENERAL_TRL_MARK = 420;
-const uint16_t FUJITSU_GENERAL_TRL_SPACE = 8000;
+constexpr uint16_t FUJITSU_GENERAL_TRL_MARK = 420;
+constexpr uint16_t FUJITSU_GENERAL_TRL_SPACE = 8000;
 
-const uint32_t FUJITSU_GENERAL_CARRIER_FREQUENCY = 38000;
+constexpr uint32_t FUJITSU_GENERAL_CARRIER_FREQUENCY = 38000;
 
 void FujitsuGeneralClimate::transmit_state() {
   if (this->mode == climate::CLIMATE_MODE_OFF) {
diff --git a/esphome/components/fujitsu_general/fujitsu_general.h b/esphome/components/fujitsu_general/fujitsu_general.h
index 8d2ec883da..93363860d4 100644
--- a/esphome/components/fujitsu_general/fujitsu_general.h
+++ b/esphome/components/fujitsu_general/fujitsu_general.h
@@ -7,8 +7,8 @@
 
 namespace esphome::fujitsu_general {
 
-const uint8_t FUJITSU_GENERAL_TEMP_MIN = 16;  // Celsius // TODO 16 for heating, 18 for cooling, unsupported in ESPH
-const uint8_t FUJITSU_GENERAL_TEMP_MAX = 30;  // Celsius
+constexpr uint8_t FUJITSU_GENERAL_TEMP_MIN = 16;  // Celsius // TODO 16 for heating, 18 for cooling, unsupported in ESPH
+constexpr uint8_t FUJITSU_GENERAL_TEMP_MAX = 30;  // Celsius
 
 // clang-format off
 /**