96% AFUE 
95% AFUE 
95% AFUE 
92% AFUE

AFUE is the standard measurement of efficiency for gas furnaces. Given in percentages, this number tells you how much of your fuel is used to heat your home and how much fuel is wasted. For example, an AFUE of 90 means that 90% of the fuel is being used to warm your home, while the other 10% escapes as exhaust with the combustion gases. The higher the AFUE rating, the greater the efficiency. Payne offers a full line of furnaces with AFUE ratings ranging from 80% to 95%. The US Department of Energy determined that all furnaces sold in the U.S. must have a minimum AFUE of 78%. (For our Canadian customers - According to National Resources Canada, a new national minimum energy performance standard for gas furnaces went into effect on December 31, 2009. Gas furnaces for most residential applications manufactured as of that date must have a minimum fuel efficiency level of 90% AFUE.)