AC and ductwork mold concerns in Vero Beach, FL

Musty smell when the AC runs in Vero Beach, FL? Get matched with a licensed mold professional to look at vents, air handlers and ducts for moisture and mold.

In Indian River County, the air conditioner runs most of the year, and it works by pulling water out of the air. That makes it one of the most common places for moisture trouble. A musty smell that shows up only when the AC kicks on is worth taking seriously.

Where the moisture comes from

• A clogged condensate drain line. The coil makes water, and the drain line carries it away. When the line clogs, water backs up into the drain pan or overflows into the ceiling or closet.
• Sweating ducts. Cold ducts in a hot attic can form droplets on the outside if the insulation is torn, wet or missing.
• A dirty or oversized system. A unit that is too big can cool the air quickly and shut off before it removes enough humidity, leaving the house cool and damp.
• Leaks around the air handler or return. Gaps can pull humid attic air into the system.

Signs to watch for

• A musty or earthy smell from the vents
• Visible dark spots around vents, on grilles or on the ceiling near a register
• Water around the air handler or a rusty drain pan
• Rooms that feel clammy even when the AC is on
• Allergy like symptoms that ease when you leave the house

What the EPA says about ducts

EPA guidance generally says that routine duct cleaning is not needed for most homes, but that visible mold growth inside hard surface ducts is a reason to act, along with fixing the moisture that caused it. Spraying chemicals into a duct without finding the cause usually does not solve the problem.

Who does what

An air conditioning contractor repairs and services the equipment, such as drain lines, coils, insulation and sizing. A licensed mold assessor looks at whether mold is present and where. A licensed mold remediator does the removal. Some jobs need more than one. Keep in mind Florida's conflict rule: the company that assesses the mold generally should not also be the one remediating it within the next 12 months.

Simple things that help

Change the filter on schedule, keep the drain line clear, and watch the humidity in the house. The EPA suggests keeping indoor humidity below 60 percent, and ideally between 30 and 50 percent. A cheap hygrometer from a hardware store will tell you where you stand. Setting the thermostat fan to on instead of auto can cause trouble in humid climates, because moisture on the coil can be blown back into the house when the compressor is off, so ask your AC contractor what is right for your system.

Licensed professionals

Florida licenses mold assessors and mold remediators separately through the Department of Business and Professional Regulation. As a general rule, the company that assesses a building should not remediate it within the next 12 months, which keeps the person who finds the problem apart from the person who sells the fix. Read how we handle that.

What it costs

An inspection of the system is often priced like a small mold inspection. Cleaning an air handler or ducts, or replacing damaged duct sections, can vary from a few hundred dollars to several thousand, depending on the amount of duct and what is found. Get a written scope.

If the air handler is in the attic, see attic and crawl space mold. To confirm what is going on, start with mold inspection and testing.

Common questions

Related services

• Mold Inspection & Testing
• Mold Remediation & Removal
• Attic & Crawl Space Mold
• Water Damage & Leak Follow Up

We refer homeowners in Vero Beach, Sebastian, Fellsmere, Indian River Shores, Vero Lake Estates, Fort Pierce, and nearby communities.

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