Set the thermostat to a comfortable setting and allow time for the unit to adjust. Setting the air conditioning below 65 degrees will cause the unit to freeze up and not operate.
Do not turn the heat off in the winter. When departing from your unit please set the thermostat at 55 degrees in winter and 75 degrees in summer.
If your unit is heating or cooling unevenly, check the vents to be sure they are open and not blocked with a suit case.