diff --git a/custom_components/dkncloudna/const.py b/custom_components/dkncloudna/const.py
new file mode 100644
index 0000000..9a57b54
--- /dev/null
+++ b/custom_components/dkncloudna/const.py
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+"""Constants for DKN Cloud NA integration."""
+
+from __future__ import annotations
+
+import logging
+
+DOMAIN = "dkncloudna"
+LOGGER = logging.getLogger(__package__)
+MANUFACTURER = "Daikin"
+
+# API
+BASE_URL = "https://dkncloudna.com/api/v1"
+API_LOGIN = "/auth/login/dknUsa"
+API_IS_LOGGED_IN = "/users/isLoggedIn/dknUsa"
+API_REFRESH_TOKEN = "/auth/refreshToken/{refresh_token}/dknUsa"
+API_INSTALLATIONS = "/installations/dknUsa"
+
+# The DKN Cloud NA API requires a mobile-like User-Agent.
+# This matches what the official DKN Cloud NA iOS app sends.
+USER_AGENT = (
+    "Mozilla/5.0 (iPhone; CPU iPhone OS 15_5 like Mac OS X) "
+    "AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148"
+)
+
+REQUEST_TIMEOUT = 30  # seconds
+
+# Config/options keys
+CONF_SCAN_INTERVAL = "scan_interval"
+CONF_EXPOSE_PII = "expose_pii"
+CONF_USER_TOKEN = "user_token"
+CONF_REFRESH_TOKEN = "refresh_token"
+
+# Defaults
+DEFAULT_SCAN_INTERVAL = 60  # seconds
+MIN_SCAN_INTERVAL = 30
+MAX_SCAN_INTERVAL = 300
+
+# Optimistic overlay: how long to hold a locally-set value before trusting
+# the next coordinator refresh. Must exceed the write→cloud→poll round-trip.
+OPTIMISTIC_TTL_SEC: float = 2.5
+
+# Post-write coordinator refresh: coalesced delay after a device command.
+POST_WRITE_REFRESH_DELAY_SEC: float = 1.0
+
+# Device modes (from homebridge plugin src/types.ts)
+# DeviceMode: 1=Auto, 2=Cool, 3=Heat, 4=Fan, 5=Dry
+DEVICE_MODE_AUTO = 1
+DEVICE_MODE_COOL = 2
+DEVICE_MODE_HEAT = 3
+DEVICE_MODE_FAN = 4
+DEVICE_MODE_DRY = 5
+
+# Fan speeds (SpeedState)
+SPEED_AUTO = 0
+SPEED_20 = 2
+SPEED_40 = 3
+SPEED_60 = 4
+SPEED_80 = 5
+SPEED_100 = 6
+
+# Temperature units
+TEMP_CELSIUS = 0
+TEMP_FAHRENHEIT = 1
diff --git a/custom_components/dkncloudna/manifest.json b/custom_components/dkncloudna/manifest.json
new file mode 100644
index 0000000..51a5345
--- /dev/null
+++ b/custom_components/dkncloudna/manifest.json
@@ -0,0 +1,11 @@
+{
+  "domain": "dkncloudna",
+  "name": "DKN Cloud NA",
+  "codeowners": ["@lavoiesl"],
+  "config_flow": true,
+  "documentation": "https://github.com/lavoiesl/homeassistant-dkncloudna",
+  "integration_type": "hub",
+  "iot_class": "cloud_polling",
+  "issue_tracker": "https://github.com/lavoiesl/homeassistant-dkncloudna/issues",
+  "version": "0.1.0"
+}