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Quick tip
An ionizer or ion generator is an air-purifying filter that generates negatively charged ions, which act as magnets for dust and dirt.
Quick tip
A cool mist humidifier is the most energy efficient, since it constantly adjusts its return of moisture back into the air; you can't over-humidify.
Quick tip
A humidistat controls the level of humidity put out by a humidifier; essential on a "warm mist" humidifier to prevent over-moisturizing a room.