We recently had a new furnace/ac system put in, and this is our first summer with it. With our old 18 yr old AC, the humidity in our house would average approx 47%. We now have a new American Standard 13-seer unit and a 95% efficiency furnace.
We are not able to get the humidity down. We can lower the thermostat, which helps moderately, but as soon as we put it back to 75, the humidity returns. Yesterday, it was about 83F, humidity was pretty high outside, and the humidity in the house was at 66%.
We had the contractor come out in late June to check on the unit, and he said it was running as it should be.
What do we need to do to get the humidity down in the house? We've also recently had a new roof installed, an attic fan with a temp/humidistat, and new windows in the last two years.