THE BEST SIDE OF HOUSE

I happen to be exploring my alternatives to incorporate AC to my 2-story, 1600 sq ft a hundred-yr-old home. I have ducts but These are very outdated and would most likely have to be redone, due to the fact I don't have any returns on the second ground. Looks as if that could Charge a minimum of $10k on your own, so I believed maybe a few mini split