Mini-Split vs. Window Unit

[Hattie York]

Hi all, 

I am currently in the process of rehabbing a duplex that is Masonry Brick. Currently there is no heating or air and previously there were window units in the living room. The units are 550sqft a piece. I originally thought to install a single head mini split in the living area so the window would not be blocked to heat and cool the units. The approx. cost of the mini split is $1184.00 per unit without the cost of install. The cost of a similar window unit (with heat function) is $799. My current tenants have been calling this week about the HVAC unit in their SFH due to the high heat index. This has raised the question of do I want to deal with constant calls to the HVAC pro to diagnosis and repair the mini split, or simply install window units with a warranty and call the warranty company if there are any problems. Just wondering what would be the best action to take in my rentals while I have this option.

Thanks