Air conditioner air handler rust condensate leaks wet insulation mold hazards leaks in the air handler can cause rust damage and may invite mold contamination in the ahu or in the hvac system ductwork.
Mold in air handler insulation.
The outside of ducts more often than inside.
You could also use an insulating hvac paint they use on ducts.
Wear rubber gloves since bleach.
Mold typically does not grow on metal glass and plastic.
Mold is common in environments that have dirt dampness and darkness.
Enough of that moisture was transported to the air handler to saturate the fiberglass insulation.
Unfortunately for homeowners black mold also loves air vents where spores are naturally circulated.
The insulation in air handler in my previous home became covered with mold.
How to remove mold from an air handler.
Mix 1 quart of liquid chlorine bleach with 3 quarts of warm water and add 1 3 cup of powdered detergent.
In some cases the air handlers simply are not insulated well enough in areas.
Leaks out of the air handler can also damage surrounding building components such as drywall or insulation.
Simply put add more insulation.
Mold spores naturally traveling in the air attach to damp areas then begin to grow.
Wear a respirator and goggles to prevent mold spores from interfering with your breathing or vision.
I often find mold on the exterior of air conditioning systems more often than the interior.