I attached a pdf of Orlando weather for may 10-20 2008. A/c should be able to maintain <50% during the day with +90^F days on 5/ 8-10. So on hot days the a/c should be setup to remove significant amounts of moisture. During days like the 5/19-20 with cool weather, the a/c will not operate enough to remove significant moisture. Expect the moisture level to rise high levels depending on the number of occupants, the outside moisture, and the amount of a/c operation. Your home has moisture from the occupants, infiltration and ventilation fresh air. Your home should have air change every 4-5 hours as minimum to purge indoor pollutants and renew oxygen. Many are using a whole house dehumidifier to provide ideal humidity and even fresh air in tight homes. Whole house dehumidifiers are capable of maintain <50%RH throughout the home during wet cool weather without any a/c operation by removing 50-150 lbs. of moisture per day. Raising the indoor t-stat temps without concern about maintaining <50%RH saves energy.
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"