If you're on the east coast it may just be that we're having such a wet year that the ambient humidity is naturally higher in your house, even with the A/C running, than it has been in past years, which equates to higher humidity in the enclosures. It's also been cooler than normal so your A/C may not even run much, which means more humid ambient air.
IIRC from my AP cages, they have no ventilation holes on the sides, only in the back. So, you could try drilling some holes in each side to get more cross-flow ventilation. If you put the holes down low on the cool side, and up high on the warm side, then the cool air from the room will naturally flow into the cool side of the enclosure, get pulled across, get warmed up by the RHP, and then flow out of the enclosure. You can cover up the holes in the winter when your house is cooler and less humid.
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