Superheat is probably the most talked about yet misunderstood technical term used by service technicians in the field. Superheat is a measured value. It is the difference between two temperatures.
Superheat is measured as the difference between the actual temperature of refrigerant vapor at a certain point and the saturation temperature of the refrigerant. Superheat on the system’s low side can be divided into two types: evaporator superheat, and total or (compressor) superheat.