class: temperature and leave out the name, since the class already defines one.

custom_components/tuya_local/devices/soleusair_air_purifier.yaml

@@ -82,7 +82,7 @@ secondary_entities:
         name: switch
         optional: true
   - entity: sensor
-    name: Temperature
+    class: temperature
     dps:
       - id: 12
         type: integer