Ok, I've been doing some extensive reading about how residential HVAC works and how to determine if your system is operating properly. There's a lot of inaccurate garbage on youtube (yeah, I know) but I had been viewing some of this guys videos and he seemed to know what he was doing until I came across this one.
Seems to me, he isn't using the sliderule calculator correctly. He is supposed to be seeing an 18° superheat and according to how he is using the calculator, it's about right on but according to his gauge readings, it's actually 4°. His suction line temp is 61° and vapor temp is 57°. Am I missing something?