Air Duct & HVAC Mold Removal Cost Calculator

Mold in your air ducts and HVAC system spreads spores to every room it serves, so it needs specialist cleaning of the ductwork, coils, and air handler. Enter the affected area for an estimate.

Quick answer

Air duct and 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

How much does air duct mold removal cost?

Air duct mold removal usually runs about $2,000–$6,000, depending on how much of the ductwork, coils, and air handler is affected and whether contaminated duct runs can be cleaned or must be replaced. Enter your affected area above for a tailored estimate.

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.