I have a few questions about my forced air heat system. The system is powered by an armstrong air Ultra 80 (125D20). The house is located in the adirondacks so the winters get cold and is roughly 2800 sq. ft.
The furnace is located on the far end of the house. So it has a long run of duct work from one end to the other. I have found that the end close to the furnace gets warm while the other end of the house has lower pressure and colder air coming from the ducts. Causing cold rooms on the one end of the house.
While trying to search for a reason for this I noticed that the duct work that makes a run down the length of the house starts with an opening from the furnace that is 1'-8" X 7". It then goes to a larger opening 2'-4" X 7". This continues for 10' or so and then jumps down to a 2'-0" X 7" opening. This also continues for another 10' or so and then jumps down to a 1'-5" X 7" opening for about 10' and then finally jumps down to 1'-1" X 7" opening and then terminates. Off of this run of duct heat is supplied to about 1600 sq. ft.
Could the reason for the lack of pressure be from the fact that it starts with a small opening and then goes to a large opening?
Would I benefit from adding two zones? If so, how hard would that be and what would I need?
I would like to insulate and rerun some of the duct work. Does anyone manufacture insulated ducts? I have found the round insulated ducts at home depot and lowes but what about the rectangular duct work?
Also I have a chimney located in the middle of the house. Would I benefit more by moving the furnace to that chimney?