Moist, humid air will get inside the insulation, even pinhole leak, and cause the pipe to sweat.
In the case of central air conditioner or heat pump, the pipe does not carry water.
The water is coming from condensation from the cold pipe and the humid air.
That happens on the outside of the pipe..
To rectify this, you or your family handyman need to insulate the pipe creating barrier around the pipe.
That includes the suction lines on your central air conditioning system, which should be copper pipe.
then you will have to call professional to look into it.
Some companies specialize water damage, and sometimes that includes dealing with the mold and mildew inside closed spaces.
I know these companies use special spray that kills the mold and mildew and prevents it from coming back anytime soon..
In this case of the sweating pipe, the fix is easy.
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