using a hygrometer from radio shack, i'm getting a reading of 44%RH in the house. i placed the hygrometer on a supply vent while the a/c was running and it went to 64%, then the minute the compressor stopped running and the airhandlier ran for a couple of minutes the RH went to 80%. thermostat set at 73deg. and the supply air at 52deg. is this normal?