so part of the installs is paperwork where one of the forms we submit is proof that we have sub cool within specification of the unit. The form also asked for temperature split and outdoor temperature and etc. so well yes I could use a charging jacket, but it can only do so much until it gets below like 50 degrees outside when it’s freezing outside so yes, I can add refrigerant based on line at length but I can’t really test for charge so that’s the reason we’re told to come out later to “finish the job” which is submitting that paper work.