By connecting to an external VOC (Volatile Organic Compounds) sensor or CO2 sensor, your thermostat shows the room air quality via three status symbols on the local idle screen. In the mobile app, the status is indicated by text instead.

Symbol on the local idle screen

Text in the mobile app


VOC level
[% of the output range]


The room air quality is good



The room air quality is okay

50% ~ 80%


The room air quality is poor


In order to ensure that the room air quality is measured accurately when the room is closed for a long time, it is recommended to force air circulation such as opening a window.