It's often your sense of smell that alerts you when something is amiss with your air conditioner. Most of the time, this isn't especially concerning. A musty smell can indicate mildew, while also suggesting it might be time to have the unit cleaned and generally serviced. A putrid smell can be more disconcerting—not only suggesting that rodents or other vermin may have found their way inside your ducts, but that they may have died while in there.
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