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    SYEINOCH's Avatar
    SYEINOCH Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Aug 18, 2009, 11:44 PM
    Air conditioner knocking
    When the air conditioner is running at night I hear a knocking noise. It is a hollow sound like slapping your hand lightly over an empty glass bottle. It is more frequent some nights and totally absent others.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Aug 19, 2009, 05:07 AM
    Sorry but I cannot be of much help on this one. I looked all over the house for a glass bottle so I could duplicate the sound but and all I have is plastic.
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
    Ultra Member
    		  
    #3

    Aug 19, 2009, 09:43 AM
    Does it do it during the daytime?

    I once new a guy with the same problem, turned out to be rats scratching their fleas
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