diff --git a/huum/huum.py b/huum/huum.py
index f933e99..42d074e 100644
--- a/huum/huum.py
+++ b/huum/huum.py
@@ -84,13 +84,16 @@ async def _make_call(self, method: str, url: str, json: Any | None = None) -> Cl
 
         return response
 
-    async def turn_on(self, temperature: int, safety_override: bool = False) -> HuumStatusResponse:
+    async def turn_on(
+        self, temperature: int, safety_override: bool = False, humidity: Optional[int] = None
+    ) -> HuumStatusResponse:
         """
-        Turns on the sauna at a given temperature
+        Turns on the sauna at a given temperature and optionally humidity
 
         Args:
             temperature: Target temperature to set the sauna to
             safety_override: If False, check if door is close before turning on the sauna
+            humidity: Target humidity duty cycle (optional)
 
         Returns:
             A `HuumStatusResponse` from the Huum API
@@ -99,12 +102,17 @@ async def turn_on(self, temperature: int, safety_override: bool = False) -> Huum
             raise ValueError(
                 f"Temperature '{temperature}' must be between {self.min_temp}-{self.max_temp}"
             )
+        data = {"targetTemperature": temperature}
+
+        if humidity is not None:
+            if humidity not in range(0, 11):
+                raise ValueError(f"Humidity '{humidity}' must be between 0-10")
+            data["humidity"] = humidity
 
         if not safety_override:
             await self._check_door()
 
         url = urljoin(API_HOME_BASE, "start")
-        data = {"targetTemperature": temperature}
 
         response = await self._make_call("post", url, json=data)
         json_data = await response.json()
diff --git a/tests/test_huum.py b/tests/test_huum.py
index 4c07ba7..e1c671e 100644
--- a/tests/test_huum.py
+++ b/tests/test_huum.py
@@ -1,5 +1,5 @@
 from typing import Any
-from unittest.mock import patch
+from unittest.mock import ANY, patch
 
 import aiohttp
 import pytest
@@ -60,6 +60,17 @@ async def test_bad_temperature_value(mock_request: Any) -> None:
         await huum.turn_on(temperature=200)
 
 
+@pytest.mark.asyncio
+@patch("aiohttp.ClientSession._request")
+async def test_bad_humidity_value(mock_request: Any) -> None:
+    mock_request.return_value = MockResponse({}, 400)
+
+    huum = Huum("test", "test")
+    await huum.open_session()
+    with pytest.raises(ValueError):
+        await huum.turn_on(temperature=40, humidity=11)
+
+
 @pytest.mark.asyncio
 @patch("aiohttp.ClientSession._request")
 async def test_set_temperature_turn_on(mock_request: Any) -> None:
@@ -78,3 +89,30 @@ async def test_set_temperature_turn_on(mock_request: Any) -> None:
     result_set_temperature = await huum.set_temperature(temperature=80)
 
     assert result_turn_on == result_set_temperature
+
+
+@pytest.mark.asyncio
+@patch("aiohttp.ClientSession._request")
+async def test_humidity_turn_on(mock_request: Any) -> None:
+    response = {
+        "statusCode": SaunaStatus.ONLINE_NOT_HEATING,
+        "door": True,
+        "temperature": 80,
+        "maxHeatingTime": 180,
+        "saunaName": "test",
+        "humidity": 5,
+    }
+    mock_request.return_value = MockResponse(response, 200)
+
+    huum = Huum("test", "test")
+    await huum.open_session()
+    result_turn_on = await huum.turn_on(temperature=80, humidity=5)
+
+    mock_request.assert_called_with(
+        "POST",
+        "https://sauna.huum.eu/action/home/start",
+        data=None,
+        auth=ANY,
+        json={"targetTemperature": 80, "humidity": 5},
+    )
+    assert result_turn_on.humidity == 5