Bad Smell from AC? Here's What It Means and What to Do
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Your air conditioner should provide relief and comfort — not an unpleasant odor. If you’ve recently detected a bad smell from AC, it’s a warning sign you shouldn’t ignore. Unusual smells coming from your AC system can be more than just annoying — they may indicate serious problems that can affect both your health and the performance of your unit. There are several reasons why your AC might be releasing unpleasant odors. Understanding these causes can help you take timely action before the issue worsens. Common Causes of Bad Smell from AC: Mold and Mildew Buildup Moisture inside the AC unit can lead to mold and mildew growth, especially on filters and coils. This is one of the most common reasons behind that musty, stale odor. Clogged or Dirty Air Filters When filters are not cleaned or replaced regularly, dust, dirt, and bacteria accumulate, contributing to the bad smell from AC. Water Drainage Issues Stagnant water in the drain pan or a blocked drainpipe can create a damp enviro...