diff --git a/libnymea/interfaces/heatpump.json b/libnymea/interfaces/heatpump.json
index 6fe96126..eb8a4621 100644
--- a/libnymea/interfaces/heatpump.json
+++ b/libnymea/interfaces/heatpump.json
@@ -1,3 +1,33 @@
 {
     "description": "The base for all heat pump interfaces. Can be used by the client to filter for heat pumps in the system."
+    "states": [
+        {
+            "name": "outdoorTemperature",
+            "type": "double",
+            "unit": "DegreeCelsius",
+            "logged": true,
+            "optional": true
+        },
+        {
+            "name": "hotWaterTemperature",
+            "type": "double",
+            "unit": "DegreeCelsius",
+            "logged": true,
+            "optional": true
+        },
+        {
+            "name": "returnTemperature",
+            "type": "double",
+            "unit": "DegreeCelsius",
+            "logged": true,
+            "optional": true
+        },
+        {
+            "name": "flowTemperature",
+            "type": "double",
+            "unit": "DegreeCelsius",
+            "logged": true,
+            "optional": true
+        }
+    ]
 }