Superheat is the measurement of the temperature increase of the refrigerant gas after it has fully evaporated in the indoor coil. This value is critical because it ensures that no liquid refrigerant returns to the compressor, which could cause "slugging" and permanent mechanical damage. Technicians check superheat when servicing our wall mount units to ensure the expansion valve is working correctly. It is a vital diagnostic for maintaining the longevity of our Mitsubishi and Cooper&Hunter systems. Proper superheat levels mean your unit is maximizing its humidity control capabilities. You can find tools for measuring these values in our parts section to keep your system in top shape.