Cost to Add Central A/C?

[Darryn Dunn]

Hello everyone! I haven't posted on this forum in over three years so I apologize in advance if this is the wrong category for this question!

I am currently underwriting one of my first residential triplex deals that I'm looking to purchase and flip. The project is in South Florida (Palm Beach County) so, as you can imagine, it's HOT! The units currently have window A/C units but I am considering the thought of adding central A/C. 

They are small 2/1 units so I'm assuming 2-ton units should be sufficient. Has anyone here done this that can give me a rough idea of what this may cost me ALL IN per unit? Thank you in advance for your help!