If the home is <45%RH inside after a couple hour run, increase your fan speed a little. This will warm the air in the ducts a little and reduce condenstion. If %RH in the 50% area, overinsulate the ducts/suction with more insulation. Make sure good vapor barrier on the outside of the insulation to prevent moisture infiltration.
Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
Use +Merv 10 air filter. -Don't forget the "Golden Rule"