Since we're on the same topic... I've been looking at some of the mini-split units found on the link below since I don't have many options for an opening large enough for a PTAC unit.
http://www.acsuperstore.com/store/LGMINI06.html
I understand that there are some units that sell with pre-charged quick connect refrigerant line sets; making it easier for the the homeowner to install. Has anyone had experience with these?