We bought a house (new construction) and moved in mid July. The house was an inventory home finished in Nov '08 and served as an open house until we bought it. Within the first week, we noticed something was not right with the AC. The house felt stuffy/clammy and vent air flow was minimal. When the AC tech came to check it out he discovered all the dampers were installed in the wrong direction. The techs flipped the dampers to the correct direction and adjusted to get good vent air flow. I purchased a thermometer/humidistat (takes indoor and outdoor readings) because the house still feels humid and clammy. The thermostat is set to 75 deg F. The relative humidity inside the house averages 58% throughout the day, even when humidity outdoors drops to the 30%s. We live in a humid area, 30 mins from the Texas coast, and are told (by AC company and builder) that's the reason why inside humidity is such and that that level is normal. I took my thermometer/humidistat to the builder's office, which is a model home, and the relative humidity read 48% (and probably would have been lower had I stayed a longer time) - their thermostat is also set at 75 deg F. If I set the thermostat at 71 deg F, I have noticed a drop in humidity to about 52%, but rises back up when thermostat is set to 75degF. I don't want to run the AC that much (high energy bill!) to lower the humidity. The builder also loaned us a dehumidifier, which brought the humidity level down to 49-50% with the thermostat set at 74-75 deg F, but as soon as we turned if off, the humidity rose back up. Any ideas as to what can be causing this problem. I have done some research and have found that ideal humidity is between 40-50%. above that, mold can start forming. Any help is appreciated. By the way, we have a two story, with separate AC units, and humidity tends to be 2-3% higher upstairs.