Multi-Family HVAC System

[Sean Pincus]

I am in the midst of putting an offer on a multifamily house. I am wondering what everyone is doing in regards to HVAC systems. I am going to gut the house and redo it all, but I want to add HVAC. 

Is everyone putting in an air handler for each unit? 

It seems extremely costly if I were to run separate ductwork and supply and returns for each unit... can someone walk me through how they're making this work.

Thanks,

Sean