Use a dehumidifier
Run air conditioning
Open windows when outdoor air is drier
Use exhaust fans in bathrooms and kitchens
Fix leaks and plumbing issues
Seal gaps around windows and doors
Dry clothes outdoors or in a dryer
Avoid boiling water or long hot showers indoors
Improve ventilation with fans
Use moisture absorbers like silica gel or calcium chloride
Keep indoor plants to a minimum
Check and clean HVAC filters
Insulate walls, windows, and pipes
Remove standing water immediately
Keep room temperature stable