I have two identical Carrier air conditioning units, one for the bottom two floors of my house, and one in the attic for the upper floor. The humidity on the lower two floors is 48%. The humidity on the upper floor is 68%. A service tech has looked at our A/C unit and pronounced it working. But the upstairs is sooooo humid, I can't believe there isn't something wrong. Has anyone else had this problem? Is it the A/C unit? Is there anything I can do to fix it? I shouldn't have to run a dehumidifier *and* and A/C unit at the same time. Any help would be appreciated. Thanks. --Ed.