I'm getting ready to install a drop ceiling down in my walkout basement. I should say this will really only be the half of the basement that has finished walls and is set up to be my Home Theater room. In the summer this room is very cold even though I have all the vents and baffles turned off. I'm thinking about insulating the vents to give me some warmth. There is a 15' long square vent running perpendicular and hanging down below the joists and then about ten 6" round ducts branching off this and running tucked up between the joists. Would it be worthwhile insulating these vents to warm up my HT during cooling season? If so, what would be the best way?
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