All Mysas are shipped with Early-On feature enabled. In Early-On mode, the thermostat will start heating 30 minutes before the scheduled setpoint. For example, if you have your thermostat set to turn on at 7:00 AM, Mysa will start heating at 6:30 AM.
You can disable the Early-On feature by going to the thermostat's setting page and scrolling to the bottom.
Tip: You'll have to turn off Early-On for every thermostat individually.