Customer has duel fuel. with one unit. Explained in winter Upstairs hot Downstairs cool. Recommend add zone system. At this time 1999 carrier furnace needs an inducer motor and wheel and cooling fin. Labor intensive to remove and install parts. Customer will receive quote today for a new Lennox furnace . also customer may have Heat-pump disconnected. Quoted parts and labor. Customer will decide if he would like to purchase furnace.