I think that will ultimately be my next project but thankfully I'm a solid 6-7 months away from needing to do that. In the summer, I really don't mind opening up a window down here and pushing the hot air out with a fan, but installing a "T" in my ductwork for this fan and a flange that I can use to divert the air outside would be super efficient.

I guess my only concern there would be creating too much negative pressure in my basement and Bogarting all the A/C from my HVAC. That's less of an issue though because again the air intake in the basement is near the floor and is pretty efficient about circulating that cold air around the house. Just horrible about circulating hot air.