Warm mist for cold nights, cool mist year-round, sensor-held

Dreo HM713S

The winter bedroom pick. It does year-round cool mist but adds warm mist that takes the chill off dry air, while a ±5% sensor holds your target and a 6L tank runs all night. Warm mode draws real power and it's tall, but for soothing mist with smart control, it's the one.

The HM713S is the pick when winter is the whole reason you're shopping: it does standard cool mist, but its warm-mist mode heats the water so the output doesn't chill an already-cold bedroom, and warm mist disperses faster in dry winter air. A humidity sensor with auto mode holds your target, the top-fill tank is large enough for overnight-plus runtimes, and app control handles scheduling. Owner reports rate it quiet on low and praise the build for the price. Two honest notes: warm-mist mode uses meaningfully more electricity, and like every ultrasonic unit it prefers distilled water in hard-water areas.

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Last reviewed Jun 11, 2026

What we like

• ✓Warm and cool mist in one unit
• ✓Humidity sensor with genuine auto mode
• ✓Large top-fill tank with overnight runtime
• ✓App scheduling and quiet low speed
• ✓Warm mist disperses well in cold rooms

Trade-offs

• −Ultrasonic - white dust with tap water (use distilled)
• −Warm-mist heating element needs periodic descaling
• −Tall and bulky (~14 in) - harder to tuck away; warm mist draws much more power
• −A few testers flagged build/durability