Thermostat adjustments are explained in detail in Owner’s Manuals.
On 13/22USG and 44UDG models, remove the front bottom grill to gain access to the electronic controller. Press P button on the controller, SP1 flashing will follow, then use arrow UP and/or arrow DOWN to increase/decrease the desired temperature. Press and release P to store the selected temperature.
On other models, locate the electromechanical thermostat at the freezer back. Using spade screwdriver, turn the thermostat knob clock-wise for cooler temperature or counter clock-wise for warmer temperature.