Hello, The house I purchased has a finished attic that is sort of like a loft area. The one side has access for storage and the other side has access for the heating. Now, the heating and cooling does not get up to this level very well so I decided to investigate. The installation of the piping is 5" steel running from the furnace to the top of the attic, both cold air return and heat/cooling. Ok, now upstairs, when the furnace is on or the AC, there is very little, and i mean very little air coming out of the vents. I crawled in behind where they ran the pipe and found out that they have used some weird pipe I have never seen before, it is 5" insulated pipe, but inside the insulation looks something like a hose you would use on your dryer. The steel pipe comes up from the basement, and is T'd off for 2 vents. The T is very warm when the furnace is on, so I know the heat is up there, not could it be this "insulated" pipe causing me the grief and should I switch it to steel or have someone come in and look at the furnace? Thanks. I hope I was clear enough.