Sent by Shaun
Editor: Window air conditioners can produce moldy odors if not maintained properly, usually when water from the unit doesn't properly drain and mold or bacterial growth begin to fester inside.
Check out this window AC maintenance checklist for future reference and the video below showing how to clean air conditioner coils. There's also some who use a bleach+water solution or Lysol to disinfect the system, but when in doubt, you'll want to call a HVAC serviceman to handle the cleaning and point out the cause of the odor.
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