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about my house aircon noise/sound?

it makes loud bang in my attic,when it start,like you hammered ,every time it start? brand name:GOODMAN.how could i fix it?
jerico elcano, August 2007
Go in the attic and make sure your unit is secure and not loose. Shut unit off and check fan compartment for and objects or any causing the noise. Make sure nothing is loose, blower wheel, fan motor, etc.

Paul, August 2007