As you can see from these pictures there are two different air flow issues that could be causing your discomfort in your home or business. The supply plenum supplies the conditioned air to your duct work that distributes the air into the living space or work...
The attached picture is of flex duct piping for a central heating and cooling system installed 25 years ago. As you can see the insulation that is to insure the heated or cooled air arrives efficiently to the room or rooms it is to heat or cool has lost it's ability...