Window units or Mini Split AC/Heat?

[Brian Lepo]

I am budgeting out the renovation of a duplex property.  The units are 500sqft each and currently have no ac or heat installed.  Would you install window units or a mini split ac/heat system or neither (leaving it up to the tenant)?  Keeping in mind the property is in a coastal region where the average "feels like temp is 95+ 4 months out of the year.