Use a dehumidifier
Run air conditioning
Improve ventilation with exhaust fans
Open windows when outdoor air is drier
Fix leaks in roofs, pipes, and walls
Seal gaps around doors and windows
Use bathroom and kitchen fans during and after use
Dry clothes outdoors or with a vented dryer
Reduce indoor plants
Cover pots while cooking
Keep gutters and drainage clear
Insulate cold surfaces to reduce condensation
Clean and maintain HVAC filters
Avoid overwatering houseplants
Use moisture absorbers in small spaces
Keep indoor humidity between 30% and 50%