On the SMX controller, you can adjust the compressor differential by pressing OFF, then SET, and then pressing SLOW and FAN together. The factory setting is 12, but it’s recommended to set it between 4 and 24. To adjust the temperature calibration, press OFF, then SET, and then press SET and UP together. Adjust to the desired temperature. This adjustment can be tricky since it’s like adjusting resistance in the thermocouple, and it takes time to respond. Once you’re finished, press OFF and restart the system.