I am looking at replacing the mechanical systems on my house and plan on conditioning the garage as well. I was considering an ERV and whole-house dehumidifier for the living area.

The basement garage needs to be dehumidified and ventilated as well but I am also aware that you don’t want the living area & garage air systems mixing.

The garage will have its own mini-split system, but I was wondering if it would  have to have its own separate dehumidifier & ventilation system as well or if there is a more practical way to approach that additional level of conditioning?