A little background: I live in Maryland, which has a very humid climate (last night humidity got up to 94%, a couple days ago it was 100%). My house was built in 1984. In August 2012 I had R-49 insulation put in the attic, and had it air sealed, and in November 2012 I got a Trane 16 SEER 2-stage variable speed HVAC system. The humidity in the house has been pretty high recently, reaching highs of around 70% with the thermostat set to 75 and the fan set to ON. Half the doors in the house don't want to close anymore, and some of the wood flooring is sticking up, like it's forming some kind of bubble.
On to my question. To reduce the humidity in my house, should I set the fan to ON or CIRC (circulate, I think it runs 30% of the time) or AUTO?
Thank you very much for any help!