The short answer is,,,,, If I am selling my home in 2 years and have to spend several thousand dollars additional to replace the unit, will I recoup my investment in the sale as the furnace is updated and more attractive to the buyer? Well kitchens and bathrooms sell homes,,, if I took the $3000 and updated my appliances or bathroom I would recoup my investment better spending my money that route.. So yes I can see that happening. If the heat exchanger is under warranty and the furnace is otherwise in good condition then sure.....honest answer