diff --git a/neohub.py b/neohub.py
index 1daea91..a99c0e3 100644
--- a/neohub.py
+++ b/neohub.py
@@ -344,3 +344,38 @@ class NeoHub:
 
         result = await self._send(message)
         return result
+
+    async def lock(self, pin: int, devices: [NeoStat]):
+        """
+        PIN locks thermostats
+
+        PIN is a four digit number
+        """
+
+        if pin < 0 or pin > 9999:
+            return False
+
+        pins = []
+        for x in range(4):
+            pins.append(pin % 10)
+            pin = pin // 10
+        pins.reverse()
+
+        names = [x.name for x in devices]
+        message = {"LOCK": [pins, names]}
+        reply = {"result": "locked"}
+
+        result = await self._send(message, reply)
+        return result
+
+    async def unlock(self, devices: [NeoStat]):
+        """
+        Unlocks PIN locked thermostats
+        """
+
+        names = [x.name for x in devices]
+        message = {"UNLOCK": names}
+        reply = {"result": "unlocked"}
+
+        result = await self._send(message, reply)
+        return result
diff --git a/neostat.py b/neostat.py
index 7fc0c6f..6b1d2b6 100644
--- a/neostat.py
+++ b/neostat.py
@@ -63,3 +63,11 @@ class NeoStat:
 
         result = await self._hub._send(message, reply)
         return result
+
+    async def lock(self, pin: int):
+        result = await self._hub.lock(pin, [self])
+        return result
+
+    async def unlock(self):
+        result = await self._hub.unlock([self])
+        return result