OOLER Silent, Regular, and Boost Settings
You can adjust the fan speed of the Control Unit only through the OOLER app.
If you set the OOLER fan speed to Silent it will be much quieter but you'll be trading cooling/heating speed for sound.
Normal will be on the quieter side but will also raise or lower the temperature at a more moderate speed.
Boost will be the loudest setting and allow the system to cool or heat in the shortest amount of time.