diff --git a/custom_components/octopus_energy/api_client/__init__.py b/custom_components/octopus_energy/api_client/__init__.py
index 71d1ec08..387ffc4f 100644
--- a/custom_components/octopus_energy/api_client/__init__.py
+++ b/custom_components/octopus_energy/api_client/__init__.py
@@ -371,6 +371,7 @@
   octoHeatPumpSetZoneMode(accountNumber: "{account_id}", euid: "{euid}", operationParameters: {{
     zone: {zone_id},
     mode: BOOST,
+    setpointInCelsius: "{target_temperature}",
     endAt: "{end_at}"
   }}) {{
     transactionId
@@ -824,14 +825,14 @@ async def async_set_heat_pump_zone_mode(self, account_id: str, euid: str, zone_i
       _LOGGER.warning(f'Failed to connect. Timeout of {self._timeout} exceeded.')
       raise TimeoutException()
     
-  async def async_boost_heat_pump_zone(self, account_id: str, euid: str, zone_id: str, end_datetime: datetime):
+  async def async_boost_heat_pump_zone(self, account_id: str, euid: str, zone_id: str, end_datetime: datetime, target_temperature: float):
     """Boost a given heat pump zone"""
     await self.async_refresh_token()
 
     try:
       client = self._create_client_session()
       url = f'{self._base_url}/v1/graphql/'
-      query = heat_pump_boost_zone_mutation.format(account_id=account_id, euid=euid, zone_id=zone_id, end_at=end_datetime.isoformat(sep="T")) 
+      query = heat_pump_boost_zone_mutation.format(account_id=account_id, euid=euid, zone_id=zone_id, end_at=end_datetime.isoformat(sep="T"), target_temperature=target_temperature) 
       payload = { "query": query }
       headers = { "Authorization": f"JWT {self._graphql_token}" }
       async with client.post(url, json=payload, headers=headers) as heat_pump_response:
diff --git a/custom_components/octopus_energy/climate.py b/custom_components/octopus_energy/climate.py
index f4cd6bb3..786388e9 100644
--- a/custom_components/octopus_energy/climate.py
+++ b/custom_components/octopus_energy/climate.py
@@ -49,6 +49,7 @@ async def async_setup_default_sensors(hass, config, async_add_entities):
         {
           vol.Required("hours"): cv.positive_int,
           vol.Required("minutes"): cv.positive_int,
+          vol.Optional("target_temperature"): cv.positive_float,
         },
         extra=vol.ALLOW_EXTRA,
       ),
diff --git a/custom_components/octopus_energy/heat_pump/zone.py b/custom_components/octopus_energy/heat_pump/zone.py
index 8f6aab02..0e147e78 100644
--- a/custom_components/octopus_energy/heat_pump/zone.py
+++ b/custom_components/octopus_energy/heat_pump/zone.py
@@ -2,10 +2,13 @@
 import logging
 from typing import List
 
+from custom_components.octopus_energy.const import DOMAIN
 from homeassistant.util.dt import (utcnow)
+from homeassistant.exceptions import ServiceValidationError
 
 from homeassistant.const import (
     UnitOfTemperature,
+    PRECISION_HALVES,
     PRECISION_TENTHS,
     ATTR_TEMPERATURE
 )
@@ -47,6 +50,7 @@ class OctopusEnergyHeatPumpZone(CoordinatorEntity, BaseOctopusEnergyHeatPumpSens
   _attr_preset_mode = None
   _attr_temperature_unit = UnitOfTemperature.CELSIUS
   _attr_target_temperature_step = PRECISION_TENTHS
+  _attr_target_temperature_step = PRECISION_HALVES
 
   def __init__(self, hass: HomeAssistant, coordinator, client: OctopusEnergyApiClient, account_id: str, heat_pump_id: str, heat_pump: HeatPump, zone: ConfigurationZone, is_mocked: bool):
     """Init sensor."""
@@ -140,20 +144,21 @@ def _handle_coordinator_update(self) -> None:
   async def async_set_hvac_mode(self, hvac_mode):
     """Set new target hvac mode."""
     try:
-      await self._client.async_set_heat_pump_zone_mode(self._account_id, self._heat_pump_id, self._zone.configuration.code, hvac_mode, None)
+      self._attr_hvac_mode = hvac_mode
+      zone_mode = self.get_zone_mode()
+      await self._client.async_set_heat_pump_zone_mode(self._account_id, self._heat_pump_id, self._zone.configuration.code, zone_mode, self._attr_target_temperature)
     except Exception as e:
       if self._is_mocked:
         _LOGGER.warning(f'Suppress async_set_hvac_mode error due to mocking mode: {e}')
       else:
         raise
 
-    self._attr_hvac_mode = hvac_mode
     self.async_write_ha_state()
 
   async def async_turn_on(self):
     """Turn the entity on."""
     try:
-      await self._client.async_set_heat_pump_zone_mode(self._account_id, self._heat_pump_id, self._zone.configuration.code, 'ON', None)
+      await self._client.async_set_heat_pump_zone_mode(self._account_id, self._heat_pump_id, self._zone.configuration.code, 'ON', self._attr_target_temperature)
     except Exception as e:
       if self._is_mocked:
         _LOGGER.warning(f'Suppress async_turn_on error due to mocking mode: {e}')
@@ -179,38 +184,29 @@ async def async_turn_off(self):
   async def async_set_preset_mode(self, preset_mode):
     """Set new target preset mode."""
     try:
-      if preset_mode == PRESET_BOOST:
+      self._attr_preset_mode = preset_mode
+      
+      if self._attr_preset_mode == PRESET_BOOST:
         current = utcnow()
         current += timedelta(hours=1)
-        await self._client.async_boost_heat_pump_zone(self._account_id, self._heat_pump_id, self._zone.configuration.code, current)
+        await self._client.async_boost_heat_pump_zone(self._account_id, self._heat_pump_id, self._zone.configuration.code, current, self._attr_target_temperature)
       else:
-        await self._client.async_set_heat_pump_zone_mode(self._account_id, self._heat_pump_id, self._zone.configuration.code, self._attr_hvac_mode, None)
+        zone_mode = self.get_zone_mode()
+        await self._client.async_set_heat_pump_zone_mode(self._account_id, self._heat_pump_id, self._zone.configuration.code, zone_mode, self._attr_target_temperature)
     except Exception as e:
       if self._is_mocked:
         _LOGGER.warning(f'Suppress async_set_preset_mode error due to mocking mode: {e}')
       else:
         raise
     
-    self._attr_preset_mode = preset_mode
     self.async_write_ha_state()
 
   async def async_set_temperature(self, **kwargs) -> None:
     """Set new target temperature."""
     temperature = kwargs[ATTR_TEMPERATURE]
 
-    zone_mode = None
-    if self._attr_preset_mode == PRESET_BOOST:
-      zone_mode = "BOOST"
-    elif self._attr_hvac_mode == HVACMode.HEAT:
-      zone_mode = "ON"
-    elif self._attr_hvac_mode == HVACMode.OFF:
-      zone_mode = "OFF"
-    elif self._attr_hvac_mode == HVACMode.AUTO:
-      zone_mode = "AUTO"
-    else:
-      raise Exception(f"Unexpected heat pump mode detected: {self._attr_hvac_mode}/{self._attr_preset_mode}")
-
     try:
+      zone_mode = self.get_zone_mode()
       await self._client.async_set_heat_pump_zone_mode(self._account_id, self._heat_pump_id, self._zone.configuration.code, zone_mode, temperature)
     except Exception as e:
       if self._is_mocked:
@@ -221,13 +217,36 @@ async def async_set_temperature(self, **kwargs) -> None:
     self._attr_target_temperature = temperature
     self.async_write_ha_state()
 
+  def get_zone_mode(self):
+    if self._attr_preset_mode == PRESET_BOOST:
+      return "BOOST"
+    elif self._attr_hvac_mode == HVACMode.HEAT:
+      return "ON"
+    elif self._attr_hvac_mode == HVACMode.OFF:
+      return "OFF"
+    elif self._attr_hvac_mode == HVACMode.AUTO:
+      return "AUTO"
+    else:
+      raise Exception(f"Unexpected heat pump mode detected: {self._attr_hvac_mode}/{self._attr_preset_mode}")
+
   @callback
-  async def async_boost_heat_pump_zone(self, hours: int, minutes: int):
+  async def async_boost_heat_pump_zone(self, hours: int, minutes: int, target_temperature: float | None = None):
     """Boost the heat pump zone"""
 
+    if target_temperature is not None:
+      if target_temperature < self._attr_min_temp or target_temperature > self._attr_max_temp:
+        raise ServiceValidationError(
+          translation_domain=DOMAIN,
+          translation_key="invalid_target_temperature",
+          translation_placeholders={ 
+            "min_temperature": self._attr_min_temp,
+            "max_temperature": self._attr_max_temp
+          },
+        )
+
     current = utcnow()
     current += timedelta(hours=hours, minutes=minutes)
-    await self._client.async_boost_heat_pump_zone(self._account_id, self._heat_pump_id, self._zone.configuration.code, current)
+    await self._client.async_boost_heat_pump_zone(self._account_id, self._heat_pump_id, self._zone.configuration.code, current, target_temperature if target_temperature is not None else self._attr_target_temperature)
 
     self._attr_preset_mode = PRESET_BOOST
     self.async_write_ha_state()
\ No newline at end of file
diff --git a/custom_components/octopus_energy/services.yaml b/custom_components/octopus_energy/services.yaml
index 0f15374c..fc85d36a 100644
--- a/custom_components/octopus_energy/services.yaml
+++ b/custom_components/octopus_energy/services.yaml
@@ -259,4 +259,12 @@ boost_heat_pump_zone:
           step: 15
           min: 0
           max: 45
+          mode: box
+    target_temperature:
+      name: Target Temperature
+      description: The optional target temperature to boost to. If not supplied, then the current target temperature will be used
+      required: false
+      selector:
+        number:
+          step: 0.5
           mode: box
\ No newline at end of file
diff --git a/custom_components/octopus_energy/translations/en.json b/custom_components/octopus_energy/translations/en.json
index bce3a406..c84ca671 100644
--- a/custom_components/octopus_energy/translations/en.json
+++ b/custom_components/octopus_energy/translations/en.json
@@ -275,6 +275,9 @@
     },
     "octoplus_points_maximum_points": {
       "message": "You cannot redeem more than {redeemable_points} points"
+    },
+    "invalid_target_temperature": {
+      "message": "Temperature must be equal or between {min_temperature} and {max_temperature}"
     }
   },
   "issues": {