Mold in Air Ducts in Boston, MA: Real Remediation, Not Just Spray

Musty smell from your vents in Boston? Here's how real duct mold remediation works and what separates it from the "we sprayed something in there" scam.

Mold in your air ducts is not something a $150 "sanitization spray" fixes. In Boston, cold winters and humid summers create ideal conditions for mold growth on cold evaporator coils, wet drain pans, and the interior of insulated duct board — and once it's there, only real remediation gets it out.

Why Boston homes are prone

Cold coils + humid Massachusetts air = constant condensation
Long AC runtime in the Northeast means constant moisture
Basement HVAC closets trap moisture with poor ventilation
Fiberglass duct board and duct liner (very common in Boston) absorb and hold moisture

What real remediation looks like

Real duct mold remediation requires:

Air sample lab test to confirm species and spore count
Full containment of the work area with negative-air machines
Source removal — physical cleaning with agitation, not just spray
EPA-registered antimicrobial applied after cleaning, not instead of
Liner or duct board replacement if the material is unsalvageable
Post-remediation clearance test with a second air sample

If a company skips the pre- and post-test, they're guessing. Walk away.

Boston pricing (real numbers)

Confirmed light mold, single system: $700–$1,400
Moderate mold with liner replacement: $1,500–$3,500
Full whole-system remediation with clearance testing: $2,500–$6,000

What NOT to buy

"Fogging only" packages under $300 — useless without source removal
UV lights sold as "mold prevention" without addressing the moisture source
Anyone who won't do a written air sample test before quoting

Related work

Once mold is out, most Boston homes also benefit from full air duct cleaning and AC coil cleaning to remove the debris the mold fed on. See our Boston location page for dispatch.