[Highland Park] air conditioning

I would appreciate any recommendations about installing air conditioning in a house without ductwork. I had thought of installing a split system, but the companies I've spoken to so far don't recommend that and they've had little experience with them. One company highly recommends Unicum high pressure ducts. The others do not. Some companies recommend Trane, others Lennox, others Carrier. Has anyone used Metro, Beam or Titan for installation?