diff --git a/homeassistant/components/isy994/__init__.py b/homeassistant/components/isy994/__init__.py
index e387196ba94..1e227b08206 100644
--- a/homeassistant/components/isy994/__init__.py
+++ b/homeassistant/components/isy994/__init__.py
@@ -227,9 +227,9 @@ async def async_unload_entry(
     """Unload a config entry."""
     unload_ok = await hass.config_entries.async_unload_platforms(entry, PLATFORMS)
 
-    isy_data = hass.data[DOMAIN][entry.entry_id]
+    isy_data: IsyData = hass.data[DOMAIN][entry.entry_id]
 
-    isy: ISY = isy_data.root
+    isy = isy_data.root
 
     _LOGGER.debug("ISY Stopping Event Stream and automatic updates")
     isy.websocket.stop()
diff --git a/homeassistant/components/isy994/entity.py b/homeassistant/components/isy994/entity.py
index 1da727fdee8..d170854396c 100644
--- a/homeassistant/components/isy994/entity.py
+++ b/homeassistant/components/isy994/entity.py
@@ -181,6 +181,7 @@ class ISYProgramEntity(ISYEntity):
 
     _actions: Program
     _status: Program
+    _node: Program
 
     def __init__(self, name: str, status: Program, actions: Program = None) -> None:
         """Initialize the ISY program-based entity."""
diff --git a/homeassistant/components/isy994/services.py b/homeassistant/components/isy994/services.py
index 6546aec6efa..24cfa9aefb1 100644
--- a/homeassistant/components/isy994/services.py
+++ b/homeassistant/components/isy994/services.py
@@ -21,6 +21,7 @@ from homeassistant.helpers.service import entity_service_call
 from homeassistant.helpers.typing import VolDictType
 
 from .const import _LOGGER, DOMAIN
+from .models import IsyData
 
 # Common Services for All Platforms:
 SERVICE_SEND_PROGRAM_COMMAND = "send_program_command"
@@ -149,7 +150,7 @@ def async_setup_services(hass: HomeAssistant) -> None:
         isy_name = service.data.get(CONF_ISY)
 
         for config_entry_id in hass.data[DOMAIN]:
-            isy_data = hass.data[DOMAIN][config_entry_id]
+            isy_data: IsyData = hass.data[DOMAIN][config_entry_id]
             isy = isy_data.root
             if isy_name and isy_name != isy.conf["name"]:
                 continue
diff --git a/homeassistant/components/isy994/switch.py b/homeassistant/components/isy994/switch.py
index 946feddcd10..d5c8a23cbea 100644
--- a/homeassistant/components/isy994/switch.py
+++ b/homeassistant/components/isy994/switch.py
@@ -157,7 +157,7 @@ class ISYEnableSwitchEntity(ISYAuxControlEntity, SwitchEntity):
             device_info=device_info,
         )
         self._attr_name = description.name  # Override super
-        self._change_handler: EventListener = None
+        self._change_handler: EventListener | None = None
 
     # pylint: disable-next=hass-missing-super-call
     async def async_added_to_hass(self) -> None: