10 Best Most Energy Efficient Humidifiers 2025 in the United States

The LEVOIT Classic 160 is a compact ultrasonic cool mist humidifier designed for bedrooms and similar-sized rooms up to about 280 square feet. It features a 2.5-liter water tank that supports up to 25 hours of continuous operation on low mist, which provides a good balance between capacity and energy use, consuming around 17 watts. This long runtime means fewer refills and less frequent power use. Its ultrasonic technology generally uses less electricity compared to traditional warm mist models, making it energy-efficient.

The Dreo Humidifier is a strong choice if you're looking for an energy-efficient cool mist humidifier suitable for bedrooms, nurseries, or similar-sized rooms up to 300 square feet. It uses ultrasonic technology, which is generally low on power consumption—at 26 watts, it is quite energy-friendly compared to other types. The large 4-liter water tank is a standout feature, allowing up to 36 hours of continuous use without refilling, which adds convenience and reduces wasteful frequent refills. Noise level is impressively low at 28 dB, making it very quiet and ideal for light sleepers or babies. The humidifier’s design includes a top-fill feature that makes refilling and cleaning easier, a helpful plus for maintenance.

The LEVOIT Smart Humidifier is designed for larger rooms up to about 505 square feet and features a sizable 6-liter water tank that allows it to run up to 60 hours continuously. Its ultrasonic technology ensures quiet operation at or below 30 decibels, making it suitable for bedrooms, nurseries, or offices where low noise is important. With 26 watts power consumption, it is relatively energy-efficient, especially considering its strong humidification output that claims to work four times faster than some competitors.