I'm considering insulating my heat duct in my unfinished basement. I think a lot of heat radiates to the basement instead of going up into the house. I have a thermometer in the basement and it reads around 68 degrees - nearly the same 70 degrees as the living space upstairs.

I went to Home Depot and they have 12" wide x 15' long R6 insulation for $7. At this size, I will need quite a few pieces of insulation to wrap my entire duct work. I'm wondering if it's worth it? Any advice is appreciated. Thanks.