We are in the process of finishing our basement. Part of the work was to replace our old AC and Furnace with a new top end Lenox system. After installation, we have had a horrible time with condensation on the supply ducts in our basement. It has gone so far as to begin to ruin our new drywall. Our installer keeps saying that it will get better but there is no sign of improvement after 3 weeks. I have stopped the basement project until I determine if we can get the condensation under control. My old system never had this problem. Any ideas? Thanks.