Originally posted by town if is more of 20 and below of 15 what is that? T/oyu
If its more than twenty you could have airflow issues. If its less than fifteen you could have a refrigeration problem. But other factors such as high humidity can effect the temperature difference. Thats why when troubleshooting a system you have to take many different measurements to determine the problem ie superheat, subcooling, indoor temp, outdoor temp, gauge pressures etc.