Originally Posted By: MoBOB
OK, I know the answer is "call an HVAC guy". However, I am wondering if anyone knows what the temperature difference between the home a/c refrigerant lines should be. I have a multimeter with a thermocouple. Should I be able to get a WAG from it? Should there be a 20-deg F drop? 30-deg F drop? Any ideas? Thanks.


According to http://hvac-talk.com/vbb/showthread.php?145014-Return-and-supply-temperature-difference it should be between 17-20 degrees F. But I don't know for myself.