I know the terms of service on this site are no DIY and I understand why but no contractor will install the mini split i have in my new home. I can not install the outside condensor unit outside (not possible in this location) it must go in an attic area facing out a window or in a large well ventilated crawl space. No one will do this for me even though it is a small 9000 btu unit (w/heat pump). I can wire it np and I purchased a precharged lineset (it doesn't use freon its the new stuff). My question is, if I just hook up the linset without vacuuming the system, will I break anything or just notice some decreased performance? At this point I just want to hook the damn thing up and be done with it. Do I absolutely have to have the lines vacuumed? People seem to be helpful here so if anyone could just plz let me know if Im going to burn my house down or blow up my AC that would be great!