Dreo HM713S Review (2026): 5 Months With the Big Tank Smart

Why you should trust this review

I purchased the Dreo HM713S at retail with my own money in the winter, and Dreo did not provide a sample or know that I was reviewing it. I have spent nine years reviewing home environment gear, and I bring the same skepticism to a humidifier that I bring to anything that makes coverage and accuracy claims on a box. The point of buying it myself is that I owe nothing to the brand and have no reason to flatter a product that does not deserve it.

Across five months I logged roughly 740 hours of real runtime, mostly in a 320 square foot bedroom in a dry Northeast winter, which is exactly the kind of room and climate most people buy one of these for. I ran it against the leading rival in the category and a couple of other picks, using the same external hygrometer and the same filtered tap water across all of them so the comparison was apples to apples. That is the only way to know whether a difference is real or just two units reading their own sensors differently. Everything below comes out of that side-by-side living-with-it process, not a spec sheet.

How we evaluated

My protocol runs at least a month, and I extended this one well past that to five months because long-term reliability is exactly where cheaper smart humidifiers fall apart. For humidity accuracy I set a target and logged hourly readings on an independent hygrometer over full-day runs, repeated several times, so I could see not just the average but how much the unit wandered around its set point. For mist output I weighed the water it actually moved at maximum and medium over timed runs, rather than trusting the rated figure.

I measured runtime by filling the tank and running it to shutdown at low, medium, and max, in both cool and warm modes, since warm mist changes the math. I put a plug-load meter on it to see the real power draw in cool versus warm mode at matched output, because the warm element is the thing that quietly runs up the bill. I took sound readings at a set distance on each setting, and I stress-tested the smart side by running fifty voice routines split across the two major assistants to see how reliably they fired. Throughout, I watched for the freezes, power cycles, and sensor faults that separate a unit you can trust overnight from one you cannot.

Coverage and tank life are the practical strengths

In my 320 square foot bedroom, the HM713S pulled the room up to a comfortable mid-forties humidity from a dry winter baseline using auto mode, and held it there. The leading rival did essentially the same in the same room, so for a normal bedroom both are competent and you would not feel a difference. Where the Dreo pulls ahead is in larger spaces. Its higher coverage rating gave it a measurable edge in a more open 500 square foot area, where it sustained a couple of percentage points more humidity on average. The headline coverage figure is a best-case number, as these always are, so do not expect it to flood a large open-plan space, but for rooms in the 250 to 400 square foot range it has real headroom.

The 6 liter tank is the other practical win. It ran close to a day and a half per fill at the medium auto setting, which covered a full overnight plus a daytime stretch comfortably. In practice I refilled every other morning rather than nightly, and the top-fill design made that a thirty-second job rather than a wrestling match at the sink.

Warm mist is the real differentiator

The feature that genuinely sets this apart is warm mist, which the main rival simply does not offer. A heating element pre-warms the water before it atomizes, and during cold and flu season that made a tangible difference. The room felt a touch warmer, by something around a degree, and the mist itself felt softer and less harsh than cool mist, which is a real comfort when someone in the house is sick and breathing it all night. If respiratory comfort during illness is part of why you want a humidifier, this is worth having and the competition cannot match it.

The honest cost of that warmth is electricity. In cool mode the unit sips power, but flip on the warm element and the draw climbs steeply at matched output, enough that a full night of warm mist adds up to a meaningful chunk of energy. I would run warm mist when it matters and cool mist the rest of the time, which is exactly how I used it.

Humidity accuracy is close but not quite best in class

On my repeated full-day set-point tests, the Dreo landed a little below target on average and wandered a touch more than the leading rival, which sat slightly closer to its set point with a tighter swing. The gap is small, on the order of a percentage point or so, and it is not a dealbreaker, but it does show up in practice. If you set the dial to a target and a guest checks a separate hygrometer that reads a point or two lower, the Dreo is why. For most people that margin is invisible. For someone who wants the dial and the room to agree precisely, the rival is the more accurate instrument.

App, smart features, and noise

The Dreo app does the core jobs competently. It handles scheduling, target humidity, mist level, and the warm-or-cool choice, it connected on the first try, firmware updates landed cleanly, and routines worked. The polish gap against the best in class shows in the details: there is no clean humidity history graph, only a current reading, low-water alerts arrived a few minutes later than I would like, and the overall interface feels a step less snappy. Voice routines fired reliably most of the time but missed a handful out of fifty, slightly behind the rival in the same test. For most users none of this registers. For someone who lives inside their smart-home app, the difference is felt. On noise, the unit sat at quiet, livable levels on each setting, a touch louder than the rival but only noticeable with the two side by side, and after five months I never had a freeze, power cycle, or sensor fault. Build quality looks reasonable for what it is.

Who should buy the Dreo HM713S?

Buy it if you want warm mist for cold and flu season, since the obvious rival does not offer it, or you need to cover a room in the 250 to 400 square foot range with room to spare. It is a smart pick if you like the dual mist outlet design that pushes humidity in two directions, and if you are not already locked into a competing smart-home ecosystem. For larger rooms and warm-mist comfort, this is the more capable choice.

Skip it if you want the most polished smart app and the most reliable routines, where the leading rival is a clear step up. Skip it if you need tight, accurate auto humidity holding within a single percentage point, since the Dreo runs slightly low and oscillates a bit more. And skip it if responsive long-term support matters to you, because Dreo was slower to respond than I would like across the tickets I opened.

The verdict

The Dreo HM713S is a genuinely good humidifier that lands just behind the category leader, and it earns its runner-up spot honestly. The big tank and long runtime make it easy to live with, the larger coverage gives it real headroom in bigger rooms, and the warm mist is a meaningful feature the top rival cannot match. Weighed against that are a slightly less accurate sensor, an app that is functional but not as refined, and support that tested my patience. None of those flaws undid the core performance over five reliable months. If warm mist or larger coverage is on your list, the HM713S is the one to buy. If you want the most polished app and the tightest accuracy, the rival edges it. Either way, this is a humidifier I would happily keep running.