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Mold in Ductwork: Signs, Causes & What to Do

Mold in ductwork is a health concern. This guide covers the signs, causes, and what to do if you suspect mold.

Signs

A musty odor from the vents and visible mold growth at registers are common signs.

Causes

Moisture in the ducts—often from a humid basement or a leaking AC coil—supports mold growth.

What to Do

Request duct cleaning if mold is confirmed. Address the moisture source to prevent recurrence.

Frequently Asked Questions

A musty odor or visible mold at registers are signs. Request duct cleaning.

Request service

Submit a service request and a coordinator will contact you to confirm technician availability. We do not confirm an appointment until availability is verified.

What happens next: A coordinator reviews your request, confirms the service type and location, and contacts you to schedule.

For emergencies: Call (312) 555-HVAC or request emergency service. For a gas leak or carbon monoxide, leave the building and call your gas utility or 911 first.

Request HVAC Service

A coordinator contacts you to confirm availability. No appointment is confirmed until verified.

Prefer to call? (312) 555-HVAC

Request service

Submit a service request and a coordinator will contact you to confirm technician availability. We do not confirm an appointment until availability is verified.