Sadly most hvac guys only replace whatever is causing the problem and don't investigate as to what is causing the problem. Condensation results from low airflow, either dirty filters, dirty evaporator coil. Improper insulation also could do it. I've had instances with all of the above including the drain pan not draining like it should. Need more details, pics might be helpful too.
I have absolutely no idea how to post pics on here..
Can you get to the condensate drain pan, if so check the water level, there shouldn't be much in there if everything is working right. One of the units in one of my stores had the evaporator freezing up and when it started to melt resulted in water in the ducts. Not saying that's your issue but the drain pan was out of line causing water to run down, ended up putting a piece of sheet metal to deflect the water back in to the pan
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