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HVAC & Air Duct Mold in Minneapolis, MN

That musty gust when the system first kicks on is the HVAC reporting its own moisture problem. Moving air is the system's whole job — which also makes it the one place in the house where mold gets handed a delivery route.

Where the water comes from — both seasons

In summer, cooling pulls humidity out of the air on purpose, and that water has to land somewhere: on the evaporator coil, in the condensate pan and its drain, and on duct metal that runs cool through warm space. A plugged condensate drain, a sagging duct holding a puddle, or a coil that never dries between cycles becomes a standing damp spot sitting in a dust-fed airstream. In winter the twist is the furnace humidifier — set too high or leaking, it feeds moisture straight into the supply plenum and the ducts downstream of it.

What the work involves

Diagnosis before cleaning: a competent crew finds the condensation point rather than selling a blanket duct cleaning, because scrubbing a duct while the coil pan still holds water is a subscription, not a repair. Depending on what turns up, the job runs from clearing and re-sloping the condensate drain, to cleaning or treating the coil and pan, to cleaning or replacing affected duct — flex duct with growth inside is usually replaced, not cleaned — to dialing back or fixing a humidifier that is over-feeding the system. The mechanical repairs belong to an HVAC contractor; a remediation crew coordinates with that trade rather than standing in for it.

Signals worth acting on

• A musty odor at start-up that fades once the system has run a while.
• Visible growth at a supply register or on the back of the grille.
• Water staining at the air handler or on a ceiling under a duct run.
• Allergy-type complaints that follow which rooms the system feeds.