What is “Dirty Sock Syndrome”? Dirty Sock Syndrome is caused by bacteria growing on HVAC system coils, and refers to the unpleasant odor that comes from your residential or commercial heat pump coils. ACHR News (Air Conditioning | Heating | Refrigeration) links DSS to these three main causes: “Cooling coils and other AC components are not made in sterile environments, meaning that microbes cover
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