Quote:
Originally Posted by retiredguy123
I would check the air handling unit for mold on the evaporator coil, or for an overflowing condensate drain pan inside the unit. Do you regularly add vinegar or flush out the condensate drain pipe? I would also remove the ceiling return air grilles to check for dirt, mold, or moisture.
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Run your heat for several minutes and the smell should disappear. It is probably coming from your duct vents.