Basement Garden Unit - Install Central AC?

[Coley B.]

Chicago area. I have a 3 unit building with GFA and all the ductwork but no AC. I plan to install central AC in the top two floors using existing furnace/ductwork. Should I also install AC for the basement unit while I'm at it? Or is that overkill given basements are cooler and the unit will only get used in July/August?

I know the tenants could put in window AC units but given its basically ground level anyone could push those in and break in easily so I don't think that would be an option.