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Condensation occurs when moisture-laden warm air strikes a cold, dry surface, such as a basement wall or window. A similar thing happens with cold water passing through copper pipes. Fortunately, minor condensation issues can be reduced substantially with a few inexpensive precautions. Difficulty: Easy.
Chances are yours are little chimneys just sucking that hot humid air back into your house. On a really warm day while the air is turned off, hold a lit piece of incense up under the can light and watch the smoke dance as the air pours into your house. Duct work is also a big culprit. Ducts usually leak like crazy. As soon as the AC turns off, all those little cracks in your ductwork start exchanging all the cool air left in the ducts for that warm moist air in your attic. And then that warm air travels to every room in your house that has a supply register.