In Gladys Assistant, you can display the average temperature of a room on your dashboard.
This box will look for the temperature of all the temperature sensors present in the room, and displays an average on the dashboard.
You must first have configured at least one temperature sensor. It could be a sensor from any protocol (Z-Wave, MQTT, whatever), and have assigned that sensor to a room.
Go to the dashboard, and click on "Edit".
Select the "room temperature" box, and click on the + button.
Then select the room you want to display.
Click on "Save".
You should see the average temperature of this room!