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 LEVOIT Dual 200S is a smart ultrasonic humidifier designed for bedrooms and small spaces up to about 290 square feet. Its 3-liter water tank is a good size, allowing several hours of continuous operation without frequent refills, which helps with convenient use and energy efficiency. At 24 watts, it uses relatively low power, making it one of the more energy-friendly options available. The built-in humidistat is a key advantage, automatically maintaining your preferred humidity level so the device doesn’t waste energy running unnecessarily. Quiet operation means it won’t disturb sleep, which is important for bedroom use.

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.