Originally Posted by bigMikeB
The reason is that you want the air from the duct to meet with the hot or cold source and mix right there. Outlets on inside walls with returns on outside walls don't work, that had been done years back and they found out it was a huge waste. You want to blanket the source of heat gain or heat loss.
So essentially what you're telling me is that by blanketing the coldest/warmest zones in the house it equalizes the temperature of the whole house? I guess that makes sense. Otherwise, there would be hot or cold spots all over the house. It sure makes a good argument for having really well-sealed windows and doors! Thanks for getting back to me!