Air Vent
What would cause a bad odor in an air conditioning vent?
3 air vents in a certain region of my house emit a terrible (musty, moldy) odor every time my AC kicks on. I've looked in my attic to inspect the air handler and duct work. Everything appears fine as far as I can tell (no obvious mold or mildew, no holes with a dead mouse in it, no intake problem, new filter, etc.), and I don't want to rip out all my air ducts without having some kind of idea as to what might be causing it. Any thoughts?
Moisture sounds like the problem......something that may help kill some of the mildew and mold spores would be to turn the system on, go to the intake vent and spray Lysol while it runs.
Let it get a good dose of that distributed through the system and then, try to locate a place where some moisture could be or could have been present and fix that.
 
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