Completed with heat 1 on a 2014 York gas horizontal in attic 3 ton, furnace poorly operating due to a few components not in good shape, heat exchanger is extremely corroded and rusted from inside, flue pipe is broken not connected all way and touching wood, very dusty ducts and alot of air leaking out since unit it's not sealed properly. Giving customer the option to replace furnace, fix flue pipe and sealed unit or complete unit upgrade. Wife cannot make a decision at this time untill relating everything to husband.