It starts with avoiding damp spots in the home that grow mold and dust mites.
This means <50RH throughout.
The next is to have fresh filtered air passing through the home when occupied. Like a fresh air change in 4-5 hours.
In green grass climates, a well tuned a/c plus a small whole house dehumidifier will maintain 50%rH when the outdoor dew point is high and moisture from occupants is present.
This the start. Where is your home located?
Right now in SW Fl we have +70^F outdoor dew points and remove about 5 gallons of moisture per day to maintain <50%RH inside the home. This with two occupants and 80 cfm of fresh air.
Regards Teddy Bear
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"