Ideas on budget friendly way to heat cool basement

[Robert Collins]

I’m looking for budget friendly ideas on how to heat & cool basement in a rental I have , the basement is finished with a room, bathroom , laundry room & living area . I’m looking to add heat & cooling some kind of way but the only thing I can come up with are doing mini splits in the bedroom & living area which will probably cost around 3k + , another thing I thought about was just focusing on the heating part since the basement usually stays cool even when it’s super hot out in Georgia .