DREO HM717S Review: Smart Warm and Cool Mist with an 8L Tank
DREO's HM717S is an 8L smart humidifier with warm and cool mist, a 550 ml per hour output for up to 600 ft² and up to 80 hours of runtime.
By Daniel Brooks
Updated October 31, 2026
The DREO HM717S 8L Smart Humidifier is an 8L smart humidifier with warm and cool mist, a 550 ml per hour output for rooms up to 600 ft² and up to 80 hours of runtime. For more models, see our Humidifiers page.
Our Verdict
The HM717S brings warm mist to DREO’s smart lineup, so one unit handles dry winter nights and summer air conditioning. High output and a precise humidistat make it suitable for large rooms.
Warm mist uses more power, and the RGB lights may be too bright for some bedrooms, although they can be adjusted.
DREO HM717S 8L Smart Humidifier
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Key Specifications
| Feature | Specification |
|---|---|
| Brand | DREO |
| Model | HM717S |
| Tank | 8L |
| Coverage | Up to 600 ft² |
| Output | 550 ml per hour |
| Runtime | Up to 80 hours |
| Mist | Warm and cool |
| Noise | 28 dB |
| Controls | App, voice, Alexa |
Design
The 8L tank runs up to 80 hours, and a 40 inch tall, 4 inch wide mist column spreads moisture through large rooms.
DREO says warm mist reaches 133°F in 8 minutes and that the unit can raise relative humidity by 18 percent in 20 minutes.
Controls
A high-precision humidistat holds your level within 5 percent, and auto mode adjusts output on its own.
The app shows real-time humidity and schedules, and Alexa and other voice assistants are supported. DREO rates the noise at 28dB.
Placement Tips
Set the humidifier on a flat, water-safe surface at least a couple of feet off the floor if you can, and aim the mist into open air rather than at walls, wood furniture, curtains or electronics. Keep it a few feet from the bed or crib so moisture spreads through the room before it reaches you.
Check the room with a hygrometer for the first few days. Most homes feel best between 40 and 60 percent relative humidity, and if windows start to fog or the room smells musty, turn the output down or let the auto mode hold a lower target.
Running Costs and Care
Running costs are low: a humidifier uses far less electricity than a space heater or air conditioner, and the main extras are water, any filters or wicks, and cleaning supplies. Warm mist models use more power than cool mist or evaporative units because they heat the water.
Empty and dry the tank when you can, and clean it at least once a week so bacteria and mold do not build up. Distilled or filtered water reduces white dust from ultrasonic units and slows scale in every type. Before storing it for summer, clean and dry every part.
How It Compares
Against the Levoit LV600S, the DREO has a larger tank and higher listed output, while the Levoit has larger listed coverage.
Against the DREO 747S, the HM717S adds warm mist but has a smaller tank.
Pros and Cons
| Pros | Cons |
|---|---|
| Warm and cool mist | Warm mist uses more power |
| 550 ml per hour output | Large unit |
| 8L tank, up to 80 hours | Bright RGB lights |
| Precise humidistat | Needs Wi-Fi for app |
| App and voice control | Hot mist near children |
Who Should Buy It
| Who Should Buy It? | Who Should Look Elsewhere? |
|---|---|
| Large bedrooms | Small nightstands |
| Living rooms | Homes with toddlers near the unit |
| Cold climates | Tight budgets |
| Smart home users | Homes without Wi-Fi |
For more options, see our picks for the best smart humidifiers and the best warm and cool mist humidifiers.
To see how it ranks against similar models, read our best warm mist humidifiers for large rooms, best smart humidifiers and best dreo humidifiers.
Final Verdict
The DREO HM717S 8L Smart Humidifier is a high-output smart humidifier that switches between warm and cool mist for year-round use. You can check the current price and details for the DREO HM717S 8L Smart Humidifier.
Frequently Asked Questions
How much space does the DREO HM717S cover?
Up to 600 ft².
How hot is the warm mist?
DREO says it reaches 133°F in 8 minutes.
How long does it run?
Up to 80 hours on its 8L tank.
How loud is it?
DREO rates it at 28 dB.
Does it work with Alexa?
Yes, it supports app and voice control including Alexa.
About the author
Daniel Brooks is a home cooling editor at WikiCooling, covering window, portable, through-the-wall and mini-split air conditioners, fans, and dehumidifiers. He researches cooling capacity, energy efficiency, noise levels, installation requirements, and buyer feedback to help homeowners choose the right unit for their room size, climate, and budget.