I added a bedroom/bath to my house a few years ago. The room stays cold in winter and warm in summer. The high efficiency HVAC system is new and quite robust for the house overall. The unfinished part of the basement and the crawl space are insulated and the temperature is now running about 7 to 8 degrees cooler than the rest of the house. 74 upstairs, 67 in basement/crawlspace. There is probably around 100' of various sizes of ductwork exposed in the unfinished part of the basement and the crawl space. There is also an HVAC vent blowing into the unfinished basement, next to the crawlspace. I'm wondering if it would be worthwhile to wrap the duct work, or would I not gain much by doing so. I'm also looking at a wall heater for the bedroom but I want to consider the duct work insulation first.
Thanks for any comments.