I've never done it before. I've always either weighed the charge in or used the pressure/temp. at the coils.
So I would like to know how to do it the "best" way.
From what I understand I take a temperature reading on the liquid line going into the evap. Then I take a temperature reading on the vapor line 6 inches from the evaporator outlet. I should have a difference of 8-12 degrees F.
Is this correct?