The ASI6200 has an integrated anti-dew heater. As per ZWO description it can be deactivated through software:
ASI6200MM Pro comes with the polyimide heater that can avoid any dew problems.
The anti-dew heater which completely fit the protective window will heat it to avoid any dew problems.
The heat anti-dew heater power is around 5W and can be turn off in software to save power
I haven't been able to find this option in the INDI control panel. Does it exist or does it need to be developed? Does anyone know if it is off by default?