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Condensation occurs when moisture-laden warm air strikes a cold, dry surface, such as a basement wall or window. A similar thing happens with cold water passing through copper pipes. Fortunately, minor condensation issues can be reduced substantially with a few inexpensive precautions. Difficulty: Easy.
Causes of Mold in Your Heating and Air Conditioning System. The two major causes of mold in your air conditioning system are condensation and organic material. Condensation occurs when parts of your air conditioning system get cold, especially when the surrounding air in the room is warm and humid.