What is the difference in the 90% + AFUE Furnace and the standard 80% AFUE Furnace?
The 90% + AFUE Furnaces are condensing Furnaces which provide up to 15% more efficiency than the 80% AFUE model. The 90% + units have a secondary heat exchanger designed [drains moisture like an AC system] to capture the heat from the exhausted flue gases before they leave the unit. This is heat is applied to your home or office normally lost to the flue system as in standard vented furnaces. When you choose this model be sure it is a 29-4C stainless steel secondary heat exchanger design!
