Originally Posted By: James Seidel
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On Thursday, Dec. 9th I had a new Amana furnace installed in my home, a two story frame with a full basement. The furnace is in the basement. It is model AMS80903BNA, single stage gas fired. It seems to be working properly but the main fan produces a very loud “hum” or “whine” when it runs. I called the installer back and he slowed the motor down from high speed to the correct medium setting for winter operation. That helped a little bit but it still makes a very loud hum compared to the Carrier furnace previously installed in the home. That was replaced because of cracked heat exchangers and was 17 years old. The installer feels the hum is produced by reverberation from the duct work. I called Amana/Goodman in Texas and they said it could be either restricted ductwork or a faulty fan. The hum is not apparent when the furnace is opened and the fan runs and one stands right in front of it. The installer did that so it seems to be working properly. The ductwork is the same as before, there are 7 returns, 4 upstairs and 3 on the main level and outlets in each room. The hum is most apparent in the house rather than near the furnace so the reverberation in the ductwork sounds logical. Any suggestions about what can be done? Any way to isolate the fan or ductwork from the furnace to prevent the loud noise? The installer seems to feel the sound is normal but we are not sure we want to live with it long term. This was a highly rated furnace that was supposed to be quiet . . .
Thanks for any input.