diff --git a/README.md b/README.md
index 3929e31..8ee30fe 100644
--- a/README.md
+++ b/README.md
@@ -105,7 +105,7 @@ Auto mode options per model:
 |-------|---------|----------------|
 | C200S | — | up to 40 m² (430 ft²) |
 | C300S | Default / Quiet / Room Size | 9–50 m² (97–538 ft²) |
-| C400S | Default / Quiet / Room Size | 9–83 m² (97–894 ft²) |
+| C400S | Default / Quiet / Room Size | 9–38 m² (97–409 ft²) |
 | C600S | Default / Quiet / Room Size / ECO | 9–147 m² (97–1,582 ft²) |
 | V100S | Default / Quiet / Efficient | 9–52 m² (97–560 ft²) |
 | V200S | Default / Quiet / Efficient | 9–87 m² (97–936 ft²) |
diff --git a/components/levoit/levoit.cpp b/components/levoit/levoit.cpp
index 46c9979..1040cd7 100644
--- a/components/levoit/levoit.cpp
+++ b/components/levoit/levoit.cpp
@@ -461,7 +461,7 @@ namespace esphome
             if (model_ == ModelType::CORE300S)
                 cadr = 214; 
             if (model_ == ModelType::CORE400S)
-                cadr = 415;
+                cadr = 442;
             if (model_ == ModelType::CORE200S)
                 cadr = 167;
             if (model_ == ModelType::CORE600S)
diff --git a/devices/levoit-core400s/README.md b/devices/levoit-core400s/README.md
index adf8e31..e49b971 100644
--- a/devices/levoit-core400s/README.md
+++ b/devices/levoit-core400s/README.md
@@ -13,8 +13,8 @@ Started from community projects ([acvigue](https://github.com/acvigue/esphome-le
 | ESP Module | ESP32-SOLO-1C |
 | Board | CORE400S Ctrl V1.2 |
 | Fan Speeds | 4 |
-| CADR (spec) | 415 m³/h |
-| Room Size | 9–83 m² (97–894 ft²) |
+| CADR (spec) | 442 m³/h |
+| Room Size | 9–38 m² (97–409 ft²) |
 | ESPHome | 2026.1.2+ |
 | PM Sensor | PM2008MS  |
 
@@ -24,7 +24,7 @@ Started from community projects ([acvigue](https://github.com/acvigue/esphome-le
 |---------|------|-------|
 | Fan | fan | 4 speeds, presets: Manual / Auto / Sleep |
 | Auto Mode | select | Default / Quiet / Room Size |
-| Auto Mode Room Size | number | 9–83 m² |
+| Auto Mode Room Size | number | 9–38 m² |
 | Display | switch | Toggle LED display |
 | Child Lock | switch | |
 | PM2.5 | sensor | µg/m³ |
diff --git a/devices/levoit-core400s/common.yaml b/devices/levoit-core400s/common.yaml
index b06a297..c57cabb 100644
--- a/devices/levoit-core400s/common.yaml
+++ b/devices/levoit-core400s/common.yaml
@@ -60,6 +60,8 @@ number:
     levoit: levoitcore400
     name: "Auto Mode Room Size"
     type: efficiency_room_size
+    min_value: 9
+    max_value: 38
   - platform: levoit
     levoit: levoitcore400
     name: "Filter Months"
diff --git a/devices/levoit-core400s/levoit-core400s-builder-c3.yaml b/devices/levoit-core400s/levoit-core400s-builder-c3.yaml
index 4c535af..1686615 100644
--- a/devices/levoit-core400s/levoit-core400s-builder-c3.yaml
+++ b/devices/levoit-core400s/levoit-core400s-builder-c3.yaml
@@ -84,6 +84,8 @@ number:
     levoit: levoitcore400
     name: "Auto Mode Room Size"
     type: efficiency_room_size
+    min_value: 9
+    max_value: 38
   - platform: levoit
     levoit: levoitcore400
     name: "Filter Months"
diff --git a/devices/levoit-core400s/levoit-core400s-builder-s3.yaml b/devices/levoit-core400s/levoit-core400s-builder-s3.yaml
index ef0e0b5..68a837b 100644
--- a/devices/levoit-core400s/levoit-core400s-builder-s3.yaml
+++ b/devices/levoit-core400s/levoit-core400s-builder-s3.yaml
@@ -84,6 +84,8 @@ number:
     levoit: levoitcore400
     name: "Auto Mode Room Size"
     type: efficiency_room_size
+    min_value: 9
+    max_value: 38
   - platform: levoit
     levoit: levoitcore400
     name: "Filter Months"
diff --git a/devices/levoit-core400s/levoit-core400s-builder.yaml b/devices/levoit-core400s/levoit-core400s-builder.yaml
index 5993bb2..c0a1fc2 100644
--- a/devices/levoit-core400s/levoit-core400s-builder.yaml
+++ b/devices/levoit-core400s/levoit-core400s-builder.yaml
@@ -81,6 +81,8 @@ number:
     levoit: levoitcore400
     name: "Auto Mode Room Size"
     type: efficiency_room_size
+    min_value: 9
+    max_value: 38
   - platform: levoit
     levoit: levoitcore400
     name: "Filter Months"