I have a 1 1/2 yr. old house in upstate S.C. The house is a two story with 1/2 finished basement. 3300 s.f. on 1st floor, 1300 sf. on second floor, and 1200 sf. in basement..There are 3 A/C units - (1) 5 ton for main floor and (2) 2 1/2 units for 2nd floor and basement. In the summer the 1st foor runs 55-65% humidity.
Based on a load study, I have too much capacity and can take the basement unit off line - tie into the 5 ton unit and install ultra -aire APD to service these 2 levels and maintain 45-48% humidity.
Based on monitoring the humidity levels in the house for the past year there has been a consistent 20% differential between the 1st flr and basement .During cold weather the humidity on 1st floor fell to 28%. To prevent trim cracking,etc. I turned on furn. humidifier to restore 45%. At the same time the basement was at 55-62% and I was running a portable de-humidifier.
Won't I have the same problem with the APD servicing both floors and the control in the basement????