diff --git a/esphome/components/ccs811/sensor.py b/esphome/components/ccs811/sensor.py
index 10565cb328..d9023a415f 100644
--- a/esphome/components/ccs811/sensor.py
+++ b/esphome/components/ccs811/sensor.py
@@ -32,14 +32,14 @@ CONFIG_SCHEMA = (
     cv.Schema(
         {
             cv.GenerateID(): cv.declare_id(CCS811Component),
-            cv.Required(CONF_ECO2): sensor.sensor_schema(
+            cv.Optional(CONF_ECO2): sensor.sensor_schema(
                 unit_of_measurement=UNIT_PARTS_PER_MILLION,
                 icon=ICON_MOLECULE_CO2,
                 accuracy_decimals=0,
                 device_class=DEVICE_CLASS_CARBON_DIOXIDE,
                 state_class=STATE_CLASS_MEASUREMENT,
             ),
-            cv.Required(CONF_TVOC): sensor.sensor_schema(
+            cv.Optional(CONF_TVOC): sensor.sensor_schema(
                 unit_of_measurement=UNIT_PARTS_PER_BILLION,
                 icon=ICON_RADIATOR,
                 accuracy_decimals=0,
@@ -64,10 +64,13 @@ async def to_code(config):
     await cg.register_component(var, config)
     await i2c.register_i2c_device(var, config)
 
-    sens = await sensor.new_sensor(config[CONF_ECO2])
-    cg.add(var.set_co2(sens))
-    sens = await sensor.new_sensor(config[CONF_TVOC])
-    cg.add(var.set_tvoc(sens))
+    if eco2_config := config.get(CONF_ECO2):
+        sens = await sensor.new_sensor(eco2_config)
+        cg.add(var.set_co2(sens))
+
+    if tvoc_config := config.get(CONF_TVOC):
+        sens = await sensor.new_sensor(tvoc_config)
+        cg.add(var.set_tvoc(sens))
 
     if version_config := config.get(CONF_VERSION):
         sens = await text_sensor.new_text_sensor(version_config)
diff --git a/esphome/components/dps310/sensor.py b/esphome/components/dps310/sensor.py
index b2a98e5bab..605812beaa 100644
--- a/esphome/components/dps310/sensor.py
+++ b/esphome/components/dps310/sensor.py
@@ -27,14 +27,14 @@ CONFIG_SCHEMA = (
     cv.Schema(
         {
             cv.GenerateID(): cv.declare_id(DPS310Component),
-            cv.Required(CONF_TEMPERATURE): sensor.sensor_schema(
+            cv.Optional(CONF_TEMPERATURE): sensor.sensor_schema(
                 unit_of_measurement=UNIT_CELSIUS,
                 icon=ICON_THERMOMETER,
                 accuracy_decimals=1,
                 device_class=DEVICE_CLASS_TEMPERATURE,
                 state_class=STATE_CLASS_MEASUREMENT,
             ),
-            cv.Required(CONF_PRESSURE): sensor.sensor_schema(
+            cv.Optional(CONF_PRESSURE): sensor.sensor_schema(
                 unit_of_measurement=UNIT_HECTOPASCAL,
                 icon=ICON_GAUGE,
                 accuracy_decimals=1,
@@ -53,10 +53,10 @@ async def to_code(config):
     await cg.register_component(var, config)
     await i2c.register_i2c_device(var, config)
 
-    if CONF_TEMPERATURE in config:
-        sens = await sensor.new_sensor(config[CONF_TEMPERATURE])
+    if temperature := config.get(CONF_TEMPERATURE):
+        sens = await sensor.new_sensor(temperature)
         cg.add(var.set_temperature_sensor(sens))
 
-    if CONF_PRESSURE in config:
-        sens = await sensor.new_sensor(config[CONF_PRESSURE])
+    if pressure := config.get(CONF_PRESSURE):
+        sens = await sensor.new_sensor(pressure)
         cg.add(var.set_pressure_sensor(sens))
diff --git a/esphome/components/ee895/sensor.py b/esphome/components/ee895/sensor.py
index 0f8f44c8a2..8c9c7e7238 100644
--- a/esphome/components/ee895/sensor.py
+++ b/esphome/components/ee895/sensor.py
@@ -26,19 +26,19 @@ CONFIG_SCHEMA = (
     cv.Schema(
         {
             cv.GenerateID(): cv.declare_id(EE895Component),
-            cv.Required(CONF_TEMPERATURE): sensor.sensor_schema(
+            cv.Optional(CONF_TEMPERATURE): sensor.sensor_schema(
                 unit_of_measurement=UNIT_CELSIUS,
                 accuracy_decimals=1,
                 device_class=DEVICE_CLASS_TEMPERATURE,
                 state_class=STATE_CLASS_MEASUREMENT,
             ),
-            cv.Required(CONF_CO2): sensor.sensor_schema(
+            cv.Optional(CONF_CO2): sensor.sensor_schema(
                 unit_of_measurement=UNIT_PARTS_PER_MILLION,
                 icon=ICON_MOLECULE_CO2,
                 accuracy_decimals=0,
                 state_class=STATE_CLASS_MEASUREMENT,
             ),
-            cv.Required(CONF_PRESSURE): sensor.sensor_schema(
+            cv.Optional(CONF_PRESSURE): sensor.sensor_schema(
                 unit_of_measurement=UNIT_HECTOPASCAL,
                 accuracy_decimals=1,
                 device_class=DEVICE_CLASS_PRESSURE,
@@ -56,14 +56,14 @@ async def to_code(config):
     await cg.register_component(var, config)
     await i2c.register_i2c_device(var, config)
 
-    if CONF_TEMPERATURE in config:
-        sens = await sensor.new_sensor(config[CONF_TEMPERATURE])
+    if temperature := config.get(CONF_TEMPERATURE):
+        sens = await sensor.new_sensor(temperature)
         cg.add(var.set_temperature_sensor(sens))
 
-    if CONF_CO2 in config:
-        sens = await sensor.new_sensor(config[CONF_CO2])
+    if co2 := config.get(CONF_CO2):
+        sens = await sensor.new_sensor(co2)
         cg.add(var.set_co2_sensor(sens))
 
-    if CONF_PRESSURE in config:
-        sens = await sensor.new_sensor(config[CONF_PRESSURE])
+    if pressure := config.get(CONF_PRESSURE):
+        sens = await sensor.new_sensor(pressure)
         cg.add(var.set_pressure_sensor(sens))
diff --git a/esphome/components/ens160_base/__init__.py b/esphome/components/ens160_base/__init__.py
index 28e77e322b..3b6ad8a4ee 100644
--- a/esphome/components/ens160_base/__init__.py
+++ b/esphome/components/ens160_base/__init__.py
@@ -28,21 +28,21 @@ UNIT_INDEX = "index"
 
 CONFIG_SCHEMA_BASE = cv.Schema(
     {
-        cv.Required(CONF_ECO2): sensor.sensor_schema(
+        cv.Optional(CONF_ECO2): sensor.sensor_schema(
             unit_of_measurement=UNIT_PARTS_PER_MILLION,
             icon=ICON_MOLECULE_CO2,
             accuracy_decimals=0,
             device_class=DEVICE_CLASS_CARBON_DIOXIDE,
             state_class=STATE_CLASS_MEASUREMENT,
         ),
-        cv.Required(CONF_TVOC): sensor.sensor_schema(
+        cv.Optional(CONF_TVOC): sensor.sensor_schema(
             unit_of_measurement=UNIT_PARTS_PER_BILLION,
             icon=ICON_RADIATOR,
             accuracy_decimals=0,
             device_class=DEVICE_CLASS_VOLATILE_ORGANIC_COMPOUNDS_PARTS,
             state_class=STATE_CLASS_MEASUREMENT,
         ),
-        cv.Required(CONF_AQI): sensor.sensor_schema(
+        cv.Optional(CONF_AQI): sensor.sensor_schema(
             icon=ICON_CHEMICAL_WEAPON,
             accuracy_decimals=0,
             device_class=DEVICE_CLASS_AQI,
@@ -62,12 +62,15 @@ async def to_code_base(config):
     var = cg.new_Pvariable(config[CONF_ID])
     await cg.register_component(var, config)
 
-    sens = await sensor.new_sensor(config[CONF_ECO2])
-    cg.add(var.set_co2(sens))
-    sens = await sensor.new_sensor(config[CONF_TVOC])
-    cg.add(var.set_tvoc(sens))
-    sens = await sensor.new_sensor(config[CONF_AQI])
-    cg.add(var.set_aqi(sens))
+    if eco2_config := config.get(CONF_ECO2):
+        sens = await sensor.new_sensor(eco2_config)
+        cg.add(var.set_co2(sens))
+    if tvoc_config := config.get(CONF_TVOC):
+        sens = await sensor.new_sensor(tvoc_config)
+        cg.add(var.set_tvoc(sens))
+    if aqi_config := config.get(CONF_AQI):
+        sens = await sensor.new_sensor(aqi_config)
+        cg.add(var.set_aqi(sens))
 
     if compensation_config := config.get(CONF_COMPENSATION):
         sens = await cg.get_variable(compensation_config[CONF_TEMPERATURE])
diff --git a/esphome/components/hte501/sensor.py b/esphome/components/hte501/sensor.py
index 7eef641c4a..17ae3a3d1b 100644
--- a/esphome/components/hte501/sensor.py
+++ b/esphome/components/hte501/sensor.py
@@ -25,13 +25,13 @@ CONFIG_SCHEMA = (
     cv.Schema(
         {
             cv.GenerateID(): cv.declare_id(HTE501Component),
-            cv.Required(CONF_TEMPERATURE): sensor.sensor_schema(
+            cv.Optional(CONF_TEMPERATURE): sensor.sensor_schema(
                 unit_of_measurement=UNIT_CELSIUS,
                 accuracy_decimals=1,
                 device_class=DEVICE_CLASS_TEMPERATURE,
                 state_class=STATE_CLASS_MEASUREMENT,
             ),
-            cv.Required(CONF_HUMIDITY): sensor.sensor_schema(
+            cv.Optional(CONF_HUMIDITY): sensor.sensor_schema(
                 unit_of_measurement=UNIT_PERCENT,
                 accuracy_decimals=1,
                 device_class=DEVICE_CLASS_HUMIDITY,
@@ -49,10 +49,10 @@ async def to_code(config):
     await cg.register_component(var, config)
     await i2c.register_i2c_device(var, config)
 
-    if CONF_TEMPERATURE in config:
-        sens = await sensor.new_sensor(config[CONF_TEMPERATURE])
+    if temperature := config.get(CONF_TEMPERATURE):
+        sens = await sensor.new_sensor(temperature)
         cg.add(var.set_temperature_sensor(sens))
 
-    if CONF_HUMIDITY in config:
-        sens = await sensor.new_sensor(config[CONF_HUMIDITY])
+    if humidity := config.get(CONF_HUMIDITY):
+        sens = await sensor.new_sensor(humidity)
         cg.add(var.set_humidity_sensor(sens))
diff --git a/esphome/components/hyt271/sensor.py b/esphome/components/hyt271/sensor.py
index 22364ce854..bf37646d4f 100644
--- a/esphome/components/hyt271/sensor.py
+++ b/esphome/components/hyt271/sensor.py
@@ -23,13 +23,13 @@ CONFIG_SCHEMA = (
     cv.Schema(
         {
             cv.GenerateID(): cv.declare_id(HYT271Component),
-            cv.Required(CONF_TEMPERATURE): sensor.sensor_schema(
+            cv.Optional(CONF_TEMPERATURE): sensor.sensor_schema(
                 unit_of_measurement=UNIT_CELSIUS,
                 accuracy_decimals=1,
                 device_class=DEVICE_CLASS_TEMPERATURE,
                 state_class=STATE_CLASS_MEASUREMENT,
             ),
-            cv.Required(CONF_HUMIDITY): sensor.sensor_schema(
+            cv.Optional(CONF_HUMIDITY): sensor.sensor_schema(
                 unit_of_measurement=UNIT_PERCENT,
                 accuracy_decimals=1,
                 device_class=DEVICE_CLASS_HUMIDITY,
@@ -47,10 +47,10 @@ async def to_code(config):
     await cg.register_component(var, config)
     await i2c.register_i2c_device(var, config)
 
-    if CONF_TEMPERATURE in config:
-        sens = await sensor.new_sensor(config[CONF_TEMPERATURE])
+    if temperature := config.get(CONF_TEMPERATURE):
+        sens = await sensor.new_sensor(temperature)
         cg.add(var.set_temperature(sens))
 
-    if CONF_HUMIDITY in config:
-        sens = await sensor.new_sensor(config[CONF_HUMIDITY])
+    if humidity := config.get(CONF_HUMIDITY):
+        sens = await sensor.new_sensor(humidity)
         cg.add(var.set_humidity(sens))
diff --git a/esphome/components/mhz19/sensor.py b/esphome/components/mhz19/sensor.py
index 10428b1e4a..106636a6ba 100644
--- a/esphome/components/mhz19/sensor.py
+++ b/esphome/components/mhz19/sensor.py
@@ -32,7 +32,7 @@ CONFIG_SCHEMA = (
     cv.Schema(
         {
             cv.GenerateID(): cv.declare_id(MHZ19Component),
-            cv.Required(CONF_CO2): sensor.sensor_schema(
+            cv.Optional(CONF_CO2): sensor.sensor_schema(
                 unit_of_measurement=UNIT_PARTS_PER_MILLION,
                 icon=ICON_MOLECULE_CO2,
                 accuracy_decimals=0,
@@ -61,16 +61,20 @@ async def to_code(config):
     await cg.register_component(var, config)
     await uart.register_uart_device(var, config)
 
-    if CONF_CO2 in config:
-        sens = await sensor.new_sensor(config[CONF_CO2])
+    if co2 := config.get(CONF_CO2):
+        sens = await sensor.new_sensor(co2)
         cg.add(var.set_co2_sensor(sens))
 
-    if CONF_TEMPERATURE in config:
-        sens = await sensor.new_sensor(config[CONF_TEMPERATURE])
+    if temperature := config.get(CONF_TEMPERATURE):
+        sens = await sensor.new_sensor(temperature)
         cg.add(var.set_temperature_sensor(sens))
 
-    if CONF_AUTOMATIC_BASELINE_CALIBRATION in config:
-        cg.add(var.set_abc_enabled(config[CONF_AUTOMATIC_BASELINE_CALIBRATION]))
+    if (
+        automatic_baseline_calibration := config.get(
+            CONF_AUTOMATIC_BASELINE_CALIBRATION
+        )
+    ) is not None:
+        cg.add(var.set_abc_enabled(automatic_baseline_calibration))
 
     cg.add(var.set_warmup_seconds(config[CONF_WARMUP_TIME]))
 
diff --git a/esphome/components/ms5611/sensor.py b/esphome/components/ms5611/sensor.py
index 168ca0c5c8..dfb6083bef 100644
--- a/esphome/components/ms5611/sensor.py
+++ b/esphome/components/ms5611/sensor.py
@@ -24,13 +24,13 @@ CONFIG_SCHEMA = (
     cv.Schema(
         {
             cv.GenerateID(): cv.declare_id(MS5611Component),
-            cv.Required(CONF_TEMPERATURE): sensor.sensor_schema(
+            cv.Optional(CONF_TEMPERATURE): sensor.sensor_schema(
                 unit_of_measurement=UNIT_CELSIUS,
                 accuracy_decimals=1,
                 device_class=DEVICE_CLASS_TEMPERATURE,
                 state_class=STATE_CLASS_MEASUREMENT,
             ),
-            cv.Required(CONF_PRESSURE): sensor.sensor_schema(
+            cv.Optional(CONF_PRESSURE): sensor.sensor_schema(
                 unit_of_measurement=UNIT_HECTOPASCAL,
                 icon=ICON_GAUGE,
                 accuracy_decimals=1,
@@ -49,10 +49,10 @@ async def to_code(config):
     await cg.register_component(var, config)
     await i2c.register_i2c_device(var, config)
 
-    if CONF_TEMPERATURE in config:
-        sens = await sensor.new_sensor(config[CONF_TEMPERATURE])
+    if temperature := config.get(CONF_TEMPERATURE):
+        sens = await sensor.new_sensor(temperature)
         cg.add(var.set_temperature_sensor(sens))
 
-    if CONF_PRESSURE in config:
-        sens = await sensor.new_sensor(config[CONF_PRESSURE])
+    if pressure := config.get(CONF_PRESSURE):
+        sens = await sensor.new_sensor(pressure)
         cg.add(var.set_pressure_sensor(sens))
diff --git a/esphome/components/ms8607/sensor.py b/esphome/components/ms8607/sensor.py
index 7ed7c61750..038f17190a 100644
--- a/esphome/components/ms8607/sensor.py
+++ b/esphome/components/ms8607/sensor.py
@@ -29,19 +29,19 @@ CONFIG_SCHEMA = (
     cv.Schema(
         {
             cv.GenerateID(): cv.declare_id(MS8607Component),
-            cv.Required(CONF_TEMPERATURE): sensor.sensor_schema(
+            cv.Optional(CONF_TEMPERATURE): sensor.sensor_schema(
                 unit_of_measurement=UNIT_CELSIUS,
                 accuracy_decimals=2,  # Resolution: 0.01
                 device_class=DEVICE_CLASS_TEMPERATURE,
                 state_class=STATE_CLASS_MEASUREMENT,
             ),
-            cv.Required(CONF_PRESSURE): sensor.sensor_schema(
+            cv.Optional(CONF_PRESSURE): sensor.sensor_schema(
                 unit_of_measurement=UNIT_HECTOPASCAL,
                 accuracy_decimals=2,  # Resolution: 0.016
                 device_class=DEVICE_CLASS_PRESSURE,
                 state_class=STATE_CLASS_MEASUREMENT,
             ),
-            cv.Required(CONF_HUMIDITY): sensor.sensor_schema(
+            cv.Optional(CONF_HUMIDITY): sensor.sensor_schema(
                 unit_of_measurement=UNIT_PERCENT,
                 accuracy_decimals=2,  # Resolution: 0.04
                 device_class=DEVICE_CLASS_HUMIDITY,
diff --git a/esphome/components/senseair/sensor.py b/esphome/components/senseair/sensor.py
index cd6d85c12b..2eb2617e30 100644
--- a/esphome/components/senseair/sensor.py
+++ b/esphome/components/senseair/sensor.py
@@ -38,7 +38,7 @@ CONFIG_SCHEMA = (
     cv.Schema(
         {
             cv.GenerateID(): cv.declare_id(SenseAirComponent),
-            cv.Required(CONF_CO2): sensor.sensor_schema(
+            cv.Optional(CONF_CO2): sensor.sensor_schema(
                 unit_of_measurement=UNIT_PARTS_PER_MILLION,
                 icon=ICON_MOLECULE_CO2,
                 accuracy_decimals=0,
@@ -57,8 +57,8 @@ async def to_code(config):
     await cg.register_component(var, config)
     await uart.register_uart_device(var, config)
 
-    if CONF_CO2 in config:
-        sens = await sensor.new_sensor(config[CONF_CO2])
+    if co2 := config.get(CONF_CO2):
+        sens = await sensor.new_sensor(co2)
         cg.add(var.set_co2_sensor(sens))
 
 
diff --git a/esphome/components/sgp30/sensor.py b/esphome/components/sgp30/sensor.py
index 8c92f55ef7..848e4e9f9f 100644
--- a/esphome/components/sgp30/sensor.py
+++ b/esphome/components/sgp30/sensor.py
@@ -37,14 +37,14 @@ CONFIG_SCHEMA = (
     cv.Schema(
         {
             cv.GenerateID(): cv.declare_id(SGP30Component),
-            cv.Required(CONF_ECO2): sensor.sensor_schema(
+            cv.Optional(CONF_ECO2): sensor.sensor_schema(
                 unit_of_measurement=UNIT_PARTS_PER_MILLION,
                 icon=ICON_MOLECULE_CO2,
                 accuracy_decimals=0,
                 device_class=DEVICE_CLASS_CARBON_DIOXIDE,
                 state_class=STATE_CLASS_MEASUREMENT,
             ),
-            cv.Required(CONF_TVOC): sensor.sensor_schema(
+            cv.Optional(CONF_TVOC): sensor.sensor_schema(
                 unit_of_measurement=UNIT_PARTS_PER_BILLION,
                 icon=ICON_RADIATOR,
                 accuracy_decimals=0,
@@ -86,32 +86,30 @@ async def to_code(config):
     await cg.register_component(var, config)
     await i2c.register_i2c_device(var, config)
 
-    if CONF_ECO2 in config:
-        sens = await sensor.new_sensor(config[CONF_ECO2])
+    if eco2_config := config.get(CONF_ECO2):
+        sens = await sensor.new_sensor(eco2_config)
         cg.add(var.set_eco2_sensor(sens))
 
-    if CONF_TVOC in config:
-        sens = await sensor.new_sensor(config[CONF_TVOC])
+    if tvoc_config := config.get(CONF_TVOC):
+        sens = await sensor.new_sensor(tvoc_config)
         cg.add(var.set_tvoc_sensor(sens))
 
-    if CONF_ECO2_BASELINE in config:
-        sens = await sensor.new_sensor(config[CONF_ECO2_BASELINE])
+    if eco2_baseline_config := config.get(CONF_ECO2_BASELINE):
+        sens = await sensor.new_sensor(eco2_baseline_config)
         cg.add(var.set_eco2_baseline_sensor(sens))
 
-    if CONF_TVOC_BASELINE in config:
-        sens = await sensor.new_sensor(config[CONF_TVOC_BASELINE])
+    if tvoc_baseline_config := config.get(CONF_TVOC_BASELINE):
+        sens = await sensor.new_sensor(tvoc_baseline_config)
         cg.add(var.set_tvoc_baseline_sensor(sens))
 
-    if CONF_STORE_BASELINE in config:
-        cg.add(var.set_store_baseline(config[CONF_STORE_BASELINE]))
+    if (store_baseline := config.get(CONF_STORE_BASELINE)) is not None:
+        cg.add(var.set_store_baseline(store_baseline))
 
-    if CONF_BASELINE in config:
-        baseline_config = config[CONF_BASELINE]
+    if baseline_config := config.get(CONF_BASELINE):
         cg.add(var.set_eco2_baseline(baseline_config[CONF_ECO2_BASELINE]))
         cg.add(var.set_tvoc_baseline(baseline_config[CONF_TVOC_BASELINE]))
 
-    if CONF_COMPENSATION in config:
-        compensation_config = config[CONF_COMPENSATION]
+    if compensation_config := config.get(CONF_COMPENSATION):
         sens = await cg.get_variable(compensation_config[CONF_HUMIDITY_SOURCE])
         cg.add(var.set_humidity_sensor(sens))
         sens = await cg.get_variable(compensation_config[CONF_TEMPERATURE_SOURCE])
diff --git a/esphome/components/shtcx/sensor.py b/esphome/components/shtcx/sensor.py
index bb83ee4482..fdb1344fb7 100644
--- a/esphome/components/shtcx/sensor.py
+++ b/esphome/components/shtcx/sensor.py
@@ -26,13 +26,13 @@ CONFIG_SCHEMA = (
     cv.Schema(
         {
             cv.GenerateID(): cv.declare_id(SHTCXComponent),
-            cv.Required(CONF_TEMPERATURE): sensor.sensor_schema(
+            cv.Optional(CONF_TEMPERATURE): sensor.sensor_schema(
                 unit_of_measurement=UNIT_CELSIUS,
                 accuracy_decimals=1,
                 device_class=DEVICE_CLASS_TEMPERATURE,
                 state_class=STATE_CLASS_MEASUREMENT,
             ),
-            cv.Required(CONF_HUMIDITY): sensor.sensor_schema(
+            cv.Optional(CONF_HUMIDITY): sensor.sensor_schema(
                 unit_of_measurement=UNIT_PERCENT,
                 accuracy_decimals=1,
                 device_class=DEVICE_CLASS_HUMIDITY,
@@ -50,10 +50,10 @@ async def to_code(config):
     await cg.register_component(var, config)
     await i2c.register_i2c_device(var, config)
 
-    if CONF_TEMPERATURE in config:
-        sens = await sensor.new_sensor(config[CONF_TEMPERATURE])
+    if temperature := config.get(CONF_TEMPERATURE):
+        sens = await sensor.new_sensor(temperature)
         cg.add(var.set_temperature_sensor(sens))
 
-    if CONF_HUMIDITY in config:
-        sens = await sensor.new_sensor(config[CONF_HUMIDITY])
+    if humidity := config.get(CONF_HUMIDITY):
+        sens = await sensor.new_sensor(humidity)
         cg.add(var.set_humidity_sensor(sens))
diff --git a/esphome/components/t6615/sensor.py b/esphome/components/t6615/sensor.py
index 6df40497a9..9315e4a669 100644
--- a/esphome/components/t6615/sensor.py
+++ b/esphome/components/t6615/sensor.py
@@ -19,7 +19,7 @@ CONFIG_SCHEMA = (
     cv.Schema(
         {
             cv.GenerateID(): cv.declare_id(T6615Component),
-            cv.Required(CONF_CO2): sensor.sensor_schema(
+            cv.Optional(CONF_CO2): sensor.sensor_schema(
                 unit_of_measurement=UNIT_PARTS_PER_MILLION,
                 accuracy_decimals=0,
                 device_class=DEVICE_CLASS_CARBON_DIOXIDE,
@@ -41,6 +41,6 @@ async def to_code(config):
     await cg.register_component(var, config)
     await uart.register_uart_device(var, config)
 
-    if CONF_CO2 in config:
-        sens = await sensor.new_sensor(config[CONF_CO2])
+    if co2 := config.get(CONF_CO2):
+        sens = await sensor.new_sensor(co2)
         cg.add(var.set_co2_sensor(sens))
diff --git a/esphome/components/t6615/t6615.cpp b/esphome/components/t6615/t6615.cpp
index c139c56ce4..1c78833500 100644
--- a/esphome/components/t6615/t6615.cpp
+++ b/esphome/components/t6615/t6615.cpp
@@ -63,7 +63,8 @@ void T6615Component::loop() {
     case T6615Command::GET_PPM: {
       const uint16_t ppm = encode_uint16(response_buffer[3], response_buffer[4]);
       ESP_LOGD(TAG, "T6615 Received CO₂=%uppm", ppm);
-      this->co2_sensor_->publish_state(ppm);
+      if (this->co2_sensor_ != nullptr)
+        this->co2_sensor_->publish_state(ppm);
       break;
     }
     default: