Ya this basement unfinished was always within a certain range temperature wise year round.
Ours too, but not now. Once you add all the goodies and people, it gets hot. It might not sound like it, but it does. Think about the 3 PCs for your machines, TVs, monitors, receivers, cable boxes, gaming consoles, etc., then and friends and family.
We didnt add heat or air, but could still cut into the drywall ceiling where the ducts are. We just break out fans if absolutely needed.
Its never so cold that we wish we had heat, just A/C sometimes.