Ductless split systems work O>K> for thee most part but are very labor intensive when it comes to repairs. Operating pressures on the Janitrol run alot lower than standard units, but this is not a concern for you. If at all possible, try to duct a split system from your basement. I know that the house is old and you may have no other choice but to go ductless. Also look into Mitsubishi units...

Good Luck