We are in the middle of a major renovation of a renthouse thats 100 miles from me. I got by the jobsite today and noticed the hvac guy has ran the lineset (rough in). It snakes up out of a closet, into the attic then back down a wall then heads outside. Seemed odd to me but he's left the lineset open at both ends. Total length is 47 feet. So is it normal to leave the lines open until they are connected? or does it not make any difference since they have to pull a vac and charge the lines anyway?