diff --git a/libnymea/interfaces/heating.json b/libnymea/interfaces/heating.json
index 6a1246bc..a4ad2f28 100644
--- a/libnymea/interfaces/heating.json
+++ b/libnymea/interfaces/heating.json
@@ -1,3 +1,4 @@
 {
-    "description": "The heating interface defines basic heating appliances."
+    "description": "The heating interface defines basic heating appliances.",
+    "extends": "power"
 }
diff --git a/libnymea/interfaces/thermostat.json b/libnymea/interfaces/thermostat.json
index a4bce193..0386290e 100644
--- a/libnymea/interfaces/thermostat.json
+++ b/libnymea/interfaces/thermostat.json
@@ -4,7 +4,9 @@
     {
       "name": "targetTemperature",
       "type": "double",
-      "unit": "DegreeCelsius"
+      "unit": "DegreeCelsius",
+      "minValue": "any",
+      "maxValue": "any"
     }
   ]
 }