Most homeowners wish that the  furnace in their home would last forever. However, sooner or later, the furnace will need to be replaced.  When you install an Amana brand  furnace you have the best warranty  in the industry.  The complete line-up of Amana brand  furnaces offer what we believe to be the best warranty programs in the heating and cooling industry.   To find the highest level of energy-efficient gas furnaces, look for the highest AFUE rating.