The answer to 'how often to replace humidifier' is that most whole-home humidifiers should be replaced every 1-2 years, depending on usage and water quality. Proper maintenance and regular replacement of the humidifier pad or filter is important to ensure the humidifier continues to function effectively and efficiently.
Over time, the humidifier pad or filter can become clogged with mineral deposits, reducing the unit's ability to add moisture to the air. Replacing the pad or filter as recommended by the manufacturer will help maintain optimal performance and indoor air quality.