What is the AFUE rating of the Goodman GM9S80 and what does it mean?
The Goodman GM9S80 has an 80% AFUE (Annual Fuel Utilization Efficiency) rating, which means that 80 cents of every energy dollar you spend warms your home. The Department of Energy (DOE) established the AFUE system to calculate the annual operating cost of residential gas furnaces. (Page 6)
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