Why it matters
The Blueair InvisibleMist Humidifier is an ultrasonic humidifier with a 3.5 liters tank, rated for 500 sq ft.
Run time per fill, per the maker: up to 48 hours.
Aim for 40 to 60 percent relative humidity indoors: drier air irritates airways and skin, wetter air feeds dust mites and mold. Use distilled or demineralized water to avoid the white mineral dust ultrasonic mist leaves behind.
A full tank holds about 3.5 liters, which adds roughly 8 pounds of water to carry or lift to the sink and back.
Spread over 48 hours, that tank works out to about 73 milliliters an hour, the rate on the setting the run time was measured at; higher settings empty it faster.
Its stated run time of 48 hours is above the middle of the range we cover: 43 of the 69 humidifiers with a stated figure come in lower, and the range runs from 10 hours to 130 hours.
Price-wise it sat in the dearest third of the 74 ultrasonic models we cover when we checked; the button shows today's price.
It qualifies for our list Best Humidifiers for Bedrooms, where it is ranked against every model that meets the same rule.
Compared with the Blueair 2-in-1 Purify + Humidify: tank 3.5 liters here vs 1 L.
The listing gives a weight of 7.8 lb.
Warranty, per the maker: 1 year.
Who it's for, and who should skip it
Good fit if
- Dry winter bedrooms
- Owners who will clean it weekly
Look elsewhere if
- Rooms far larger than its rating
Pros and cons
Pros
- 3.5 liters tank
- Runs up to 48 hours per fill
- Rated for 500 sq ft
Cons
- Needs regular cleaning to stay hygienic
- Ultrasonic mist leaves white dust with hard water
Limitations to weigh
- Not stated on the Blueair InvisibleMist Humidifier listing: tank size, noise level, power draw. Ask the seller or check the manual before relying on it.
Specifications
The bracket shows where each figure comes from.
| Price | $149.99 | Maker |
|---|---|---|
| Warranty | 1 years | Maker |
| Product weight | 7.8 lb | Maker |
| Run time per fill | up to 48 hours | Maker |
| Room coverage | 500 sq ft | Maker |
| Tank capacity | 3.5 liters | Retailer |
| Replacement interval | 6 months | Retailer |
Alternatives worth comparing
More room humidifiers we cover
- Vornado EVDC300 Humidifier
- Levoit Superior 6000S Smart Evaporative Humidifier $249.99
- KZF ZG-521 Humidifier
- Levoit Classic 160 2.5L Top Fill Ultrasonic Humidifiers $39.99
- Pure Enrichment HUME Humidifier
All room humidifiers, compared in one table · Every Blueair product we cover
Final verdict
A practical choice for dry winter bedrooms. Confirm the model it fits before ordering.
Where to buy
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