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When people think about mold in buildings, they often think about visible water damage — a flooded basement, a leaking roof, or condensation on a window. What is less commonly understood is that the HVAC system in a home can be a contributing factor in mold development, even without an obvious water event.

How HVAC Systems and Moisture Interact

The cooling function of an air conditioning system removes heat from the air — but it also removes moisture. The evaporator coil is intentionally designed to allow condensation to form on its surface and drain away. This process works as intended when the system is properly sized, maintained, and d...