A PureGuardian humidifier is a great choice for those looking for an effective and reliable way to improve indoor air quality. These humidifiers use ultrasonic technology to generate a fine mist that can help to moisturize the air and prevent the growth of mold and mildew. PureGuardian humidifiers are available in a variety of sizes and styles to suit any need, and they offer many features that other brands do not, such as a built-in humidistat and an automatic shut-off function.