When I built the house 18 years ago:
Re: unfinished basement in Atlanta, Ga.
Company "A" put '1' return vent in the basement.
Company "A" put in 1 supply vent
18 Years later:
Basement is still unfinished. Company "B" replaces the old tired Goodman HVAC heat pump system (3 tons)
Company "B" permanently does away with the return vent in the basement. His rationale was you don't need it and it will pull in "basement smell" into the system.
Company "B" leaves the 1 supply vent in place.
I do use the 1 supply vent to help cool the basement and it seems to deter the HVAC pipes from sweating.
At no time did company A or B make any reference to pulling humidity out of the basement. Basement does have a boat door and it is opened and left open while I cut grass or do yard chores. (Wish I could say it is because I have a boat but I don't!!)
So what do you Pros do in a basement? Should it have a return or not? Thoughts? Opinions are appreciated.