The Dreo HM735S is a large humidifier that tries to do a lot, and it mostly succeeds. The headline feature is the 11-liter tank, which delivers a genuine 100-hour runtime on its lowest setting. That means you can fill it once and forget about it for nearly four days, even in a dry winter room. It covers up to 700 square feet, so it’s built for open-plan living spaces or large master bedrooms, not just a cramped office.

In daily use, the ultrasonic operation is genuinely quiet at 26dB—you won’t hear it over a fan or white noise machine. The top-fill design is a practical win: you lift the lid and pour water in from a pitcher, no need to wrestle a heavy tank to the sink. The self-cleaning function uses a built-in cartridge to reduce mineral buildup, which cuts down on the white dust that plagues many ultrasonic models. The auto mode adjusts output based on the room’s humidity, and the app control works reliably for scheduling and remote adjustments.

The downsides are minor but worth noting. The RGB night light and aroma box are nice extras, but the light is more novelty than functional—there’s no warm white option for bedtime. The digital display is bright and clear, but you’ll want to dim it if the unit sits in your bedroom. For the price, the build feels solid and the 517 customer ratings back up the reliability. If you need a set-and-forget solution for a dry, large room, this is one of the better options available.