Mold in HVAC Systems
HVAC systems can become contaminated with mold when condensation collects in coils, drain pans, or ducts. Once present, the system can distribute spores throughout the building.
Common locations
Cooling coils, drain pans, plenums, insulated duct liners, and supply registers.
Warning signs
Musty odors when the system runs, dirty register grilles, water in drain pans, or visible growth on coils.
When to inspect
If odors increase when the system operates, after any condensate overflow, or as part of a broader IAQ assessment.
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