Hi, I have a new ducts instaled and Carrier Infinity MVP 56 furnace and Performance condenser 3 ton.
I have heating going very lucluster to front of house LRm ,Drm, Kitchen.
Duct[38feet 16x8" is run with 4- 90 degree elbow from furnace room to crawl space which semi insulated [walls are brick ,cieling drywall and insulation between joist],
duct main trunk runs surface on that cieling then supply branches round pipes 6",6 registers trough floor ,air flow pressure not enough,room is cold 5-7 F degreee diference where t.stat located.[infinity controll]
also when heating, i touched the duct in crawl space is nice warm , shuld be inuslated? and how, with what material, thnaks Gy