5 Common HVAC Odors (And What Causes Them) 1 1. Electrical Odors. If your HVAC unit smells like it might be overheating, it very well could be. Turn your unit off before attempting to diagnose … 2 2. Rotten Egg Smell. 3 3. Gas Smell. 4 4. Musty or Moldy Smell. 5 5. Smell of Oil.
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