Condensation on or near an A/C vent means moisture is present at that surface; it does not prove mold is growing inside the ducts. Possible contributors include indoor humidity, a cold surface, insulation gaps, air leakage, or equipment and drainage conditions. A musty smell alone cannot identify the cause.
Correct moisture before considering cleaning
Check for visible water, a clogged condensate drain, gaps in insulation, or air leaks, and ask an HVAC professional to assess persistent condensation. EPA says moisture control is central to mold control. If mold is suspected inside ductwork, ask for the condition to be documented; wet or moldy insulated duct material cannot be effectively cleaned and may need replacement.
Routine duct cleaning has not been shown to prevent health problems. It does not fix a leak, reduce indoor humidity by itself, or replace a needed equipment repair.
Local next steps
If you are in Little Creek or elsewhere in Virginia Beach, a photo inspection can document an accessible duct concern before you choose service. For a separate pest-entry problem, see Universal Pest in Virginia Beach. Compare the tier-specific benefits of the Total Home Health plans.