Signs
- Musty smell when the system turns on.
- Visible growth around supply registers or inside the air handler.
- Wet or rusty drain pan under the coil.
- Symptoms that seem worse when the system runs.
Common causes
- Clogged condensate drain or pan — see AC leaks
- Ducts that ran through a flooded basement or crawlspace
- Condensation on uninsulated ducts
- Humidifier or swamp cooler moisture
- Construction dust and debris left in ducts
What cleaning involves
- Find and fix the moisture source.
- Clean the air handler, coil area, and drain pan.
- Clean ducts and registers; replace damaged duct insulation or flex duct where needed.
- Replace filters.
See HVAC cleaning after water or fire damage. Call (385) 250-2825 for an inspection.
Musty air from vents?
Call (385) 250-2825 — answered live 24/7 by the Vault crew.
Mold remediation services · HVAC cleaning · Musty smell guide
Found mold in a Provo home? Start with a mold inspection, then see how we handle mold remediation in Provo. Call (385) 250-2825.