How often should I use a humidifier to maintain optimal indoor air quality?

Using a humidifier to maintain optimal indoor air quality depends on the humidity level in your home. Generally, it is recommended to use a humidifier when the humidity level is below 30-50. Monitor the humidity level regularly and use the humidifier as needed to keep it within this range. Overusing a humidifier can lead to excess moisture in the air, which can promote mold growth and other issues.