I live in savannah, ga. Hot and humid. I have a Bryant 8 year old puron system with the above mentioned thermostat. I cant get the temp below 78 degrees. The baby just runs and runs. Have had service and they say it is ok. Our humidity in our home is high as well. Again has always ran perfectly, humid and hot or not. The heat function works great. How should I set my dehumidifier? I have a variable speed fan. PS the tstat works fine.