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Mold RemediationHVAC Mold Removal Cost Calculator
Mold in the HVAC system spreads spores to every room it serves, so it needs specialist cleaning of ducts, coils, and the air handler. Enter the affected area for an estimate.
HVAC mold removal typically costs $2,000–$6,000, often around $25–$35 per square foot of affected system because ductwork, coils, and the air handler each need cleaning or replacement. Whole-system contamination with duct replacement runs higher.
How this calculator works
We price the affected system area at a higher per-square-foot rate that reflects specialist duct and coil cleaning, then add duct cleaning and post-job testing. Badly contaminated ductwork is often replaced rather than cleaned, which pushes toward the high end.
What changes the number
- Ductwork can sometimes be cleaned, but heavily contaminated runs are usually replaced.
- The evaporator coil and air handler are common mold sites and need separate attention.
- Running the system spreads spores house-wide — shut it off until remediated.
- A humidity or condensation problem at the unit must be fixed to prevent recurrence.
Frequently asked questions
Can mold in HVAC be cleaned or must ducts be replaced?
Light contamination on hard surfaces can be cleaned; porous or heavily contaminated flex duct is usually replaced. A pro will assess which runs are salvageable.
Is HVAC mold dangerous?
It can be — the system distributes spores to every room, so symptoms are often house-wide. Turn the system off and have it assessed before running it again.