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  1. #1
    Join Date
    Oct 2007
    Location
    New Jersey
    Posts
    8

    Default Oder from return air duct

    Only during the heating season do I get an oder from a return air duct. In the summer, when the AC is used, there isn't an oder. The oder smells like something died in the return air duct. I smell this oder when the furnice is NOT running. The family says it smells like a gas leak but I've had the gas company to my hause, who have told me there is no leak. What could be causing this oder and how can I eliminate it?

  2. #2
    Join Date
    Aug 2007
    Posts
    6,481

    Default Re: Oder from return air duct

    Remove the air grill and inspect the return air inlet and duct. If the duct is accessible in the attic, inspect it there as well. Look for signs of water, rodent, duct damage, etc. Course of remedy will depend on what is found during inspection.
    I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!

  3. #3
    Join Date
    Oct 2007
    Location
    New Jersey
    Posts
    8

    Default Re: Oder from return air duct

    I should have mentioned, the whole system has been cleaned.

  4. #4
    Join Date
    Jul 2009
    Location
    Northeast
    Posts
    661

    Default Re: Oder from return air duct

    Your indoor coil probably needs to be cleaned, drain pan also, Heat Pumps usually have this happen but straight A/C Systems get it also, just not as bad or often. Bacteria gets on the indoor coil and scum starts to form in the drain pan from standing water, pretty nasty looking. They have Chemicals for Evap coils that are safe (not to be mixed up with condenser cleaner) and are available. You should have an HVAC Contractor do this as it could get involved, they will have anything that is needed. Good Luck!!!
    Last edited by Sten; 10-07-2009 at 03:19 PM.

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