diff --git a/homeassistant/components/isy994/binary_sensor.py b/homeassistant/components/isy994/binary_sensor.py
index 69db4afd1be..aa7c3d55147 100644
--- a/homeassistant/components/isy994/binary_sensor.py
+++ b/homeassistant/components/isy994/binary_sensor.py
@@ -421,6 +421,8 @@ class ISYInsteonBinarySensorEntity(ISYBinarySensorEntity):
 class ISYBinarySensorHeartbeat(ISYNodeEntity, BinarySensorEntity, RestoreEntity):
     """Representation of the battery state of an ISY sensor."""
 
+    _attr_device_class = BinarySensorDeviceClass.BATTERY
+
     def __init__(
         self,
         node: Node,
@@ -522,11 +524,6 @@ class ISYBinarySensorHeartbeat(ISYNodeEntity, BinarySensorEntity, RestoreEntity)
         """
         return bool(self._computed_state)
 
-    @property
-    def device_class(self) -> BinarySensorDeviceClass:
-        """Get the class of this device."""
-        return BinarySensorDeviceClass.BATTERY
-
     @property
     def extra_state_attributes(self) -> dict[str, Any]:
         """Get the state attributes for the device."""
diff --git a/homeassistant/components/isy994/climate.py b/homeassistant/components/isy994/climate.py
index 4ddbbd86060..3ac2fd18473 100644
--- a/homeassistant/components/isy994/climate.py
+++ b/homeassistant/components/isy994/climate.py
@@ -83,6 +83,8 @@ class ISYThermostatEntity(ISYNodeEntity, ClimateEntity):
         | ClimateEntityFeature.TARGET_TEMPERATURE
         | ClimateEntityFeature.TARGET_TEMPERATURE_RANGE
     )
+    _attr_target_temperature_step = 1.0
+    _attr_fan_modes = [FAN_AUTO, FAN_ON]
 
     def __init__(self, node: Node, device_info: DeviceInfo | None = None) -> None:
         """Initialize the ISY Thermostat entity."""
@@ -90,13 +92,6 @@ class ISYThermostatEntity(ISYNodeEntity, ClimateEntity):
         self._uom = self._node.uom
         if isinstance(self._uom, list):
             self._uom = self._node.uom[0]
-        self._hvac_action: str | None = None
-        self._hvac_mode: str | None = None
-        self._fan_mode: str | None = None
-        self._temp_unit = None
-        self._current_humidity = 0
-        self._target_temp_low = 0
-        self._target_temp_high = 0
 
     @property
     def temperature_unit(self) -> str:
@@ -155,11 +150,6 @@ class ISYThermostatEntity(ISYNodeEntity, ClimateEntity):
             self._node.status, self._uom, self._node.prec, 1
         )
 
-    @property
-    def target_temperature_step(self) -> float | None:
-        """Return the supported step of target temperature."""
-        return 1.0
-
     @property
     def target_temperature(self) -> float | None:
         """Return the temperature we try to reach."""
@@ -185,11 +175,6 @@ class ISYThermostatEntity(ISYNodeEntity, ClimateEntity):
             return None
         return convert_isy_value_to_hass(target.value, target.uom, target.prec, 1)
 
-    @property
-    def fan_modes(self) -> list[str]:
-        """Return the list of available fan modes."""
-        return [FAN_AUTO, FAN_ON]
-
     @property
     def fan_mode(self) -> str:
         """Return the current fan mode ie. auto, on."""
@@ -210,26 +195,18 @@ class ISYThermostatEntity(ISYNodeEntity, ClimateEntity):
                 target_temp_low = target_temp
         if target_temp_low is not None:
             await self._node.set_climate_setpoint_heat(int(target_temp_low))
-            # Presumptive setting--event stream will correct if cmd fails:
-            self._target_temp_low = target_temp_low
         if target_temp_high is not None:
             await self._node.set_climate_setpoint_cool(int(target_temp_high))
-            # Presumptive setting--event stream will correct if cmd fails:
-            self._target_temp_high = target_temp_high
         self.async_write_ha_state()
 
     async def async_set_fan_mode(self, fan_mode: str) -> None:
         """Set new target fan mode."""
         _LOGGER.debug("Requested fan mode %s", fan_mode)
         await self._node.set_fan_mode(HA_FAN_TO_ISY.get(fan_mode))
-        # Presumptive setting--event stream will correct if cmd fails:
-        self._fan_mode = fan_mode
         self.async_write_ha_state()
 
     async def async_set_hvac_mode(self, hvac_mode: HVACMode) -> None:
         """Set new target hvac mode."""
         _LOGGER.debug("Requested operation mode %s", hvac_mode)
         await self._node.set_climate_mode(HA_HVAC_TO_ISY.get(hvac_mode))
-        # Presumptive setting--event stream will correct if cmd fails:
-        self._hvac_mode = hvac_mode
         self.async_write_ha_state()
diff --git a/homeassistant/components/isy994/switch.py b/homeassistant/components/isy994/switch.py
index 39b84faad30..8467cba9e6a 100644
--- a/homeassistant/components/isy994/switch.py
+++ b/homeassistant/components/isy994/switch.py
@@ -112,6 +112,8 @@ class ISYSwitchEntity(ISYNodeEntity, SwitchEntity):
 class ISYSwitchProgramEntity(ISYProgramEntity, SwitchEntity):
     """A representation of an ISY program switch."""
 
+    _attr_icon = "mdi:script-text-outline"  # Matches isy program icon
+
     @property
     def is_on(self) -> bool:
         """Get whether the ISY switch program is on."""
@@ -131,11 +133,6 @@ class ISYSwitchProgramEntity(ISYProgramEntity, SwitchEntity):
                 f"Unable to run 'else' clause on program switch {self._actions.address}"
             )
 
-    @property
-    def icon(self) -> str:
-        """Get the icon for programs."""
-        return "mdi:script-text-outline"  # Matches isy program icon
-
 
 class ISYEnableSwitchEntity(ISYAuxControlEntity, SwitchEntity):
     """A representation of an ISY enable/disable switch."""