diff --git a/custom_components/versatile_thermostat/base_thermostat.py b/custom_components/versatile_thermostat/base_thermostat.py
index 25bbebd..8737609 100644
--- a/custom_components/versatile_thermostat/base_thermostat.py
+++ b/custom_components/versatile_thermostat/base_thermostat.py
@@ -880,6 +880,11 @@ class BaseThermostat(ClimateEntity, RestoreEntity):
         """Return the unit of measurement."""
         return self._unit
 
+    @property
+    def ema_temperature(self) -> str:
+        """Return the EMA temperature."""
+        return self._ema_temp
+
     @property
     def hvac_mode(self) -> HVACMode | None:
         """Return current operation."""
@@ -1671,7 +1676,7 @@ class BaseThermostat(ClimateEntity, RestoreEntity):
         for under in self._underlyings:
             await under.turn_off()
 
-    async def _async_manage_window_auto(self):
+    async def _async_manage_window_auto(self, in_cycle=False):
         """The management of the window auto feature"""
 
         async def dearm_window_auto(_):
@@ -1701,9 +1706,17 @@ class BaseThermostat(ClimateEntity, RestoreEntity):
         if not self._window_auto_algo:
             return
 
-        slope = self._window_auto_algo.add_temp_measurement(
-            temperature=self._ema_temp, datetime_measure=self._last_temperature_mesure
-        )
+        if in_cycle:
+            slope = self._window_auto_algo.check_age_last_measurement(
+                temperature=self._ema_temp,
+                datetime_now=datetime.now(get_tz(self._hass)),
+            )
+        else:
+            slope = self._window_auto_algo.add_temp_measurement(
+                temperature=self._ema_temp,
+                datetime_measure=self._last_temperature_mesure,
+            )
+
         _LOGGER.debug(
             "%s - Window auto is on, check the alert. last slope is %.3f",
             self,
@@ -2052,6 +2065,9 @@ class BaseThermostat(ClimateEntity, RestoreEntity):
             self._attr_preset_mode,
         )
 
+        # check auto_window conditions
+        await self._async_manage_window_auto(in_cycle=True)
+
         # Issue 56 in over_climate mode, if the underlying climate is not initialized, try to initialize it
         for under in self._underlyings:
             if not under.is_initialized:
@@ -2095,9 +2111,6 @@ class BaseThermostat(ClimateEntity, RestoreEntity):
                 force,
             )
 
-        # calculate the smooth_temperature with EMA calculation
-        await self._async_manage_window_auto()
-
         self.update_custom_attributes()
         return True
 
diff --git a/custom_components/versatile_thermostat/open_window_algorithm.py b/custom_components/versatile_thermostat/open_window_algorithm.py
index 2bbd418..267efb7 100644
--- a/custom_components/versatile_thermostat/open_window_algorithm.py
+++ b/custom_components/versatile_thermostat/open_window_algorithm.py
@@ -13,9 +13,13 @@ from datetime import datetime
 _LOGGER = logging.getLogger(__name__)
 
 # To filter bad values
-MIN_DELTA_T_SEC = 15  # two temp mesure should be > 10 sec
+MIN_DELTA_T_SEC = 0  # two temp mesure should be > 0 sec
 MAX_SLOPE_VALUE = 2  # slope cannot be > 2 or < -2 -> else this is an aberrant point
 
+MAX_DURATION_SEC = 600  # a fake data point is added in the cycle if last measurement was older than 600 sec (10 min)
+
+MIN_NB_POINT = 4  # do not calculate slope until we have enough point
+
 
 class WindowOpenDetectionAlgorithm:
     """The class that implements the algorithm listed above"""
@@ -25,6 +29,7 @@ class WindowOpenDetectionAlgorithm:
     _last_slope: float
     _last_datetime: datetime
     _last_temperature: float
+    _nb_point: int
 
     def __init__(self, alert_threshold, end_alert_threshold) -> None:
         """Initalize a new algorithm with the both threshold"""
@@ -32,6 +37,21 @@ class WindowOpenDetectionAlgorithm:
         self._end_alert_threshold = end_alert_threshold
         self._last_slope = None
         self._last_datetime = None
+        self._nb_point = 0
+
+    def check_age_last_measurement(self, temperature, datetime_now) -> float:
+        """ " Check if last measurement is old and add
+        a fake measurement point if this is the case
+        """
+        if self._last_datetime is None:
+            return self.add_temp_measurement(temperature, datetime_now)
+
+        delta_t_sec = float((datetime_now - self._last_datetime).total_seconds())
+        if delta_t_sec >= MAX_DURATION_SEC:
+            return self.add_temp_measurement(temperature, datetime_now)
+        else:
+            # do nothing
+            return self._last_slope
 
     def add_temp_measurement(
         self, temperature: float, datetime_measure: datetime
@@ -43,6 +63,7 @@ class WindowOpenDetectionAlgorithm:
             _LOGGER.debug("First initialisation")
             self._last_datetime = datetime_measure
             self._last_temperature = temperature
+            self._nb_point = self._nb_point + 1
             return None
 
         _LOGGER.debug(
@@ -72,22 +93,25 @@ class WindowOpenDetectionAlgorithm:
             )
             return lspe
 
-        # if self._last_slope is None:
-        self._last_slope = round(new_slope, 4)
-        # else:
-        #    self._last_slope = (0.5 * self._last_slope) + (0.5 * new_slope)
+        if self._last_slope is None:
+            self._last_slope = round(new_slope, 4)
+        else:
+            self._last_slope = round((0.2 * self._last_slope) + (0.8 * new_slope), 4)
 
         self._last_datetime = datetime_measure
         self._last_temperature = temperature
 
+        self._nb_point = self._nb_point + 1
         _LOGGER.debug(
-            "delta_t=%.3f delta_temp=%.3f new_slope=%.3f last_slope=%s slope=%.3f",
+            "delta_t=%.3f delta_temp=%.3f new_slope=%.3f last_slope=%s slope=%.3f nb_point=%s",
             delta_t,
             delta_temp,
             new_slope,
             lspe,
             self._last_slope,
+            self._nb_point,
         )
+
         return self._last_slope
 
     def is_window_open_detected(self) -> bool:
@@ -95,22 +119,20 @@ class WindowOpenDetectionAlgorithm:
         if self._alert_threshold is None:
             return False
 
-        return (
-            self._last_slope < -self._alert_threshold
-            if self._last_slope is not None
-            else False
-        )
+        if self._nb_point < MIN_NB_POINT or self._last_slope is None:
+            return False
+
+        return self._last_slope < -self._alert_threshold
 
     def is_window_close_detected(self) -> bool:
         """True if the last calculated slope is above (cause negative) the _end_alert_threshold"""
         if self._end_alert_threshold is None:
             return False
 
-        return (
-            self._last_slope >= self._end_alert_threshold
-            if self._last_slope is not None
-            else False
-        )
+        if self._nb_point < MIN_NB_POINT or self._last_slope is None:
+            return False
+
+        return self._last_slope >= self._end_alert_threshold
 
     @property
     def last_slope(self) -> float:
diff --git a/custom_components/versatile_thermostat/sensor.py b/custom_components/versatile_thermostat/sensor.py
index f02ebdf..79bad92 100644
--- a/custom_components/versatile_thermostat/sensor.py
+++ b/custom_components/versatile_thermostat/sensor.py
@@ -51,6 +51,7 @@ async def async_setup_entry(
         LastTemperatureSensor(hass, unique_id, name, entry.data),
         LastExtTemperatureSensor(hass, unique_id, name, entry.data),
         TemperatureSlopeSensor(hass, unique_id, name, entry.data),
+        EMATemperatureSensor(hass, unique_id, name, entry.data),
     ]
     if entry.data.get(CONF_DEVICE_POWER):
         entities.append(EnergySensor(hass, unique_id, name, entry.data))
@@ -542,3 +543,54 @@ class RegulatedTemperatureSensor(VersatileThermostatBaseEntity, SensorEntity):
     def suggested_display_precision(self) -> int | None:
         """Return the suggested number of decimal digits for display."""
         return 1
+
+
+class EMATemperatureSensor(VersatileThermostatBaseEntity, SensorEntity):
+    """Representation of a Exponential Moving Average temp"""
+
+    def __init__(self, hass: HomeAssistant, unique_id, name, entry_infos) -> None:
+        """Initialize the regulated temperature sensor"""
+        super().__init__(hass, unique_id, entry_infos.get(CONF_NAME))
+        self._attr_name = "EMA temperature"
+        self._attr_unique_id = f"{self._device_name}_ema_temperature"
+
+    @callback
+    async def async_my_climate_changed(self, event: Event = None):
+        """Called when my climate have change"""
+        _LOGGER.debug("%s - climate state change", self._attr_unique_id)
+
+        if math.isnan(self.my_climate.ema_temperature) or math.isinf(
+            self.my_climate.ema_temperature
+        ):
+            raise ValueError(
+                f"Sensor has illegal state {self.my_climate.ema_temperature}"
+            )
+
+        old_state = self._attr_native_value
+        self._attr_native_value = self.my_climate.ema_temperature
+        if old_state != self._attr_native_value:
+            self.async_write_ha_state()
+        return
+
+    @property
+    def icon(self) -> str | None:
+        return "mdi:thermometer-lines"
+
+    @property
+    def device_class(self) -> SensorDeviceClass | None:
+        return SensorDeviceClass.TEMPERATURE
+
+    @property
+    def state_class(self) -> SensorStateClass | None:
+        return SensorStateClass.MEASUREMENT
+
+    @property
+    def native_unit_of_measurement(self) -> str | None:
+        if not self.my_climate:
+            return UnitOfTemperature.CELSIUS
+        return self.my_climate.temperature_unit
+
+    @property
+    def suggested_display_precision(self) -> int | None:
+        """Return the suggested number of decimal digits for display."""
+        return 2