Indoor humidity control refers to the management of moisture levels within a building to create a comfortable and healthy environment. Maintaining optimal humidity, typically between 30% and 50%, helps prevent issues like mold growth, dust mites, and respiratory problems. Methods for controlling indoor humidity include using dehumidifiers to remove excess moisture, humidifiers to add moisture when air is too dry, and proper ventilation to allow fresh air circulation. Monitoring humidity levels with a hygrometer can help ensure that indoor air quality remains balanced and comfortable.