Window ac with outdated electricity

[Cory Dessauer]

So due to mistakes on my part and misplaced trust in my agent, the property I purchased has only one unit with up to code electric, with the other units having only one up to code outlet per, which is used for the living room ac. I've been asked, reasonably I might add, to furnish a second window unit for each tenant and I intend to do so. However I am unsure if I should do so with the other units having only the old 2 prong outlets. I cannot afford to rewire the units at this date and time.