The TH8321WF, and the TH811R, TH8320R, TH8321R (Redlink)  thermostats requires that you download the Total Comfort Control (TCC) app. Then after you register the thermostat on this app you will be able download the Lyric app and then bring that TH8321WF in to the new app. There is an option in the Lyric app to import that thermostat. For the TH8 series redlink thermostats it will require a redlink gateway. That gate way can host up to 4 redlink thermostats.