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Four Reasons Your Air Conditioner Smells Bad A strange, strong, or generally bad smell from your air conditioner is a sign something’s wrong. The scent could resemble gunpowder, urine, rotten eggs, or stale socks. Possibilities for it include: Coolant Leaks Mold or Mildew Organic Waste Electrical Issues Each year, people rely more and more on their central air conditioners to...