diff --git a/esphome/components/max44009/max44009.cpp b/esphome/components/max44009/max44009.cpp
index 8b8e38c1e..cbce05351 100644
--- a/esphome/components/max44009/max44009.cpp
+++ b/esphome/components/max44009/max44009.cpp
@@ -8,17 +8,17 @@ namespace max44009 {
 static const char *const TAG = "max44009.sensor";
 
 // REGISTERS
-static const uint8_t MAX44009_REGISTER_CONFIGURATION = 0x02;
-static const uint8_t MAX44009_LUX_READING_HIGH = 0x03;
-static const uint8_t MAX44009_LUX_READING_LOW = 0x04;
+static constexpr uint8_t MAX44009_REGISTER_CONFIGURATION = 0x02;
+static constexpr uint8_t MAX44009_LUX_READING_HIGH = 0x03;
+static constexpr uint8_t MAX44009_LUX_READING_LOW = 0x04;
 // CONFIGURATION MASKS
-static const uint8_t MAX44009_CFG_CONTINUOUS = 0x80;
+static constexpr uint8_t MAX44009_CFG_CONTINUOUS = 0x80;
 // ERROR CODES
-static const uint8_t MAX44009_OK = 0;
-static const uint8_t MAX44009_ERROR_WIRE_REQUEST = -10;
-static const uint8_t MAX44009_ERROR_OVERFLOW = -20;
-static const uint8_t MAX44009_ERROR_HIGH_BYTE = -30;
-static const uint8_t MAX44009_ERROR_LOW_BYTE = -31;
+static constexpr int8_t MAX44009_OK = 0;
+static constexpr int8_t MAX44009_ERROR_WIRE_REQUEST = -10;
+static constexpr int8_t MAX44009_ERROR_OVERFLOW = -20;
+static constexpr int8_t MAX44009_ERROR_HIGH_BYTE = -30;
+static constexpr int8_t MAX44009_ERROR_LOW_BYTE = -31;
 
 void MAX44009Sensor::setup() {
   bool state_ok = false;
diff --git a/esphome/components/max44009/max44009.h b/esphome/components/max44009/max44009.h
index 59eea66ed..d0ffd7bc7 100644
--- a/esphome/components/max44009/max44009.h
+++ b/esphome/components/max44009/max44009.h
@@ -28,8 +28,8 @@ class MAX44009Sensor : public sensor::Sensor, public PollingComponent, public i2
   uint8_t read_(uint8_t reg);
   void write_(uint8_t reg, uint8_t value);
 
-  int error_;
-  MAX44009Mode mode_;
+  int8_t error_{0};
+  MAX44009Mode mode_{MAX44009_MODE_AUTO};
 };
 
 }  // namespace max44009
diff --git a/esphome/components/modbus_controller/output/modbus_output.h b/esphome/components/modbus_controller/output/modbus_output.h
index 0fb4bb89e..3f3cadfe2 100644
--- a/esphome/components/modbus_controller/output/modbus_output.h
+++ b/esphome/components/modbus_controller/output/modbus_output.h
@@ -15,7 +15,7 @@ class ModbusFloatOutput : public output::FloatOutput, public Component, public S
     this->register_type = ModbusRegisterType::HOLDING;
     this->start_address = start_address;
     this->offset = offset;
-    this->bitmask = bitmask;
+    this->bitmask = 0xFFFFFFFF;
     this->register_count = register_count;
     this->sensor_value_type = value_type;
     this->skip_updates = 0;
@@ -47,7 +47,7 @@ class ModbusBinaryOutput : public output::BinaryOutput, public Component, public
   ModbusBinaryOutput(uint16_t start_address, uint8_t offset) {
     this->register_type = ModbusRegisterType::COIL;
     this->start_address = start_address;
-    this->bitmask = bitmask;
+    this->bitmask = 0xFFFFFFFF;
     this->sensor_value_type = SensorValueType::BIT;
     this->skip_updates = 0;
     this->register_count = 1;
diff --git a/esphome/components/tuya/climate/tuya_climate.h b/esphome/components/tuya/climate/tuya_climate.h
index 31bef5763..09f3fd30c 100644
--- a/esphome/components/tuya/climate/tuya_climate.h
+++ b/esphome/components/tuya/climate/tuya_climate.h
@@ -105,8 +105,8 @@ class TuyaClimate : public climate::Climate, public Component {
   optional<uint8_t> sleep_id_{};
   optional<float> eco_temperature_{};
   TuyaDatapointType eco_type_{};
-  uint8_t active_state_;
-  uint8_t fan_state_;
+  uint8_t active_state_{0};
+  uint8_t fan_state_{0};
   optional<uint8_t> swing_vertical_id_{};
   optional<uint8_t> swing_horizontal_id_{};
   optional<uint8_t> fan_speed_id_{};
@@ -119,9 +119,9 @@ class TuyaClimate : public climate::Climate, public Component {
   bool swing_horizontal_{false};
   bool heating_state_{false};
   bool cooling_state_{false};
-  float manual_temperature_;
-  bool eco_;
-  bool sleep_;
+  float manual_temperature_{NAN};
+  bool eco_{false};
+  bool sleep_{false};
   bool reports_fahrenheit_{false};
 };