What is the GM9S80 and what are its main features?

The Goodman GM9S80 is a single-stage gas furnace with 80% AFUE energy efficiency performance. It features a multi-speed ECM motor, a heavy-duty aluminized steel heat exchanger with wrinkle-bend technology, a self-diagnostic control board with LED display, and is designed for quiet, efficient operation that can help lower utility bills compared to single-speed blower motors.