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  1. #1
    Join Date
    Jun 2014
    Posts
    3

    Default Mold in furnace/a.c. room

    Hello all -

    My wife and I recently discovered mold growing along the exposed ceiling (floor joists to first floor), insulation (which doesn't feel wet to the touch), wood panelling that divides this room from rest of the basement, and exposed studs that holds the paneling, in the room that houses our furnace/air conditioner in our basement. We have consulted both mold testers and mold cleaning spe******ts and several HVAC technicians, all of which believe the condensation that is building up on the unit while the A/C is running is the cause for the moisture and mold growth. However there doesn't appear to be a clear consensus on what to do to stop it from coming back. Some have suggested putting a louvered door on the room - which seems like a reasonable suggestion, but I'm not sure that would be enough to fix the issue.

    Any ideas?

  2. #2
    Join Date
    Jan 2008
    Posts
    1,905

    Default Re: Mold in furnace/a.c. room

    First remove the existing mold, then leave the door somewhat open (about a foot should be enough) for some time (at least a couple warm humid months) to see if the mold returns- if it doesn't then a louvered door is the answer. If it does you need more ventilation in the room and the door needs to be solid to ensure that the new ventilation will always be enough in that room and not be acquiring more from outside the room bringing it in to feed the new mold. A louvered door is usually enough.

    Phil

  3. #3
    Join Date
    Aug 2007
    Location
    Maryland
    Posts
    1,517

    Default Re: Mold in furnace/a.c. room

    Insulating any ducts within the room should help prevent condensation on the ducts. Ventilating the room with a louvered door or louvers high and low should keep the room dry.

  4. #4
    Join Date
    Jun 2014
    Posts
    3

    Default Re: Mold in furnace/a.c. room

    Thanks.

    Any thought to also running a dehumidifier in the room as well?

  5. #5
    Join Date
    Aug 2007
    Location
    Maryland
    Posts
    1,517

    Default Re: Mold in furnace/a.c. room

    While a dehumidifier would work, it seems like overkill for a small utility room that probably just needs ventilation. The cost of running it, hassle of emptying or routing a drain or pump, installing electric for everything would be a bit much when a simpler solution is probably available.
    Have you figured out the reason for the moisture? A/C and furnaces both generate a lot of moisture. A/C condenses it from the air and has to drained out. High efficiency furnaces mostly exhaust the water through the flue.
    Is there a humidifier installed in the ductwork that leaks? Is it properly maintained or shut off/drained in the summer?
    Are there pipes in the space that condense water or possibly leak. Is the room against a damp exterior wall?
    If you don't want a louvered door to a living space because of the noise, can louvers to an adjacent space that isn't used, be installed. Again high and low will give the best ventilation.
    There should be no code issues with louvers as long as a fuel fired furnace room and door isn't next to a bedroom.

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