diff --git a/custom_components/systemair/modbus.py b/custom_components/systemair/modbus.py
index 371391d..bbbe214 100644
--- a/custom_components/systemair/modbus.py
+++ b/custom_components/systemair/modbus.py
@@ -505,6 +505,15 @@ class ModbusParameter:
         description="Enabling of eco mode",
         boolean=True,
     ),
+    # Free Cooling
+    ModbusParameter(
+        register=4100,
+        sig=IntegerType.UINT,
+        reg_type=RegisterType.Holding,
+        short="REG_FREE_COOLING_ON_OFF",
+        description="Enabling of free cooling",
+        boolean=True,
+    ),
     # Filter replacement
     ModbusParameter(
         register=7005,
@@ -776,6 +785,7 @@ class ModbusParameter:
     for short in [
         "REG_FILTER_REMAINING_TIME_L",
         "REG_FILTER_REMAINING_TIME_H",
+        "REG_FREE_COOLING_ON_OFF",
         "REG_USERMODE_CROWDED_AIRFLOW_LEVEL_SAF",
         "REG_USERMODE_REFRESH_AIRFLOW_LEVEL_SAF",
         "REG_USERMODE_FIREPLACE_AIRFLOW_LEVEL_SAF",
diff --git a/custom_components/systemair/switch.py b/custom_components/systemair/switch.py
index b71611d..fa1a5ec 100644
--- a/custom_components/systemair/switch.py
+++ b/custom_components/systemair/switch.py
@@ -32,6 +32,12 @@ class SystemairSwitchEntityDescription(SwitchEntityDescription):
         icon="mdi:leaf",
         registry=parameter_map["REG_ECO_MODE_ON_OFF"],
     ),
+    SystemairSwitchEntityDescription(
+        key="free_cooling",
+        translation_key="free_cooling",
+        icon="mdi:snowflake",
+        registry=parameter_map["REG_FREE_COOLING_ON_OFF"],
+    ),
 )