Easy way to find out if you are low on refrigerant

For ductless units , like Mitsubishi

[@mikeyaeger2965]

Hey-
Thanks for helping me out!!
Thanks for taking time out of your day to put this all together!!!
Your a good guy!!

[@loudepot]

Mike Yaeger thanks no problem keep watching and supporting us so we can keep making more tutorials, tell a friend lou :-))

[@xcmskim4]

For LG units, I was informed that the temperature difference has to be greater than 46 degrees for cooling and 57 degrees for heating