This weekend, I went down into the basement to check the size of the air filter for the HVAC unit. When I got down there and starting looking around, however, I saw this:
So what did we learn today, kids? Not only is there no active source of heating/cooling to the parlor, but we are also apparently heating the basement. Who knows how long these vents haven't been attached and how much money has been wasted over who-knows-how-many years to blow hot and cold air down there. Looks like I'll need to add one more project to the (growing) list, and run a new duct to the vent. I guess it's just another opportunity to expand my mad home-improvement skills.