The Pure Enrichment MistAire Ultrasonic Cool Mist Humidifier is one of the most popular compact humidifiers on the market, designed to add soothing moisture to bedrooms, nurseries, and small offices. It pairs well with a small bedroom cooling setup like the Frigidaire FFRE053WAE 5,000 BTU Window AC for year-round comfort. Whether you just unboxed yours or you're researching before buying, this guide walks you through everything you need to know — from setup and daily use to cleaning, troubleshooting, and getting the most out of its features.
TL;DR: The MistAire is a quiet, ultrasonic cool mist humidifier with a 1.5-liter tank, two mist settings, a 360° rotating nozzle, an optional night light, and automatic shut-off. It's ideal for rooms up to about 250 square feet and runs up to 16 hours on a single fill.
What's in the Box
When you unbox the MistAire, you'll find the main humidifier unit, a removable water tank, an AC power adapter, a cleaning brush, and the user manual. There are no extra filters to install — the ultrasonic technology vibrates water into a fine mist without needing a wick filter.
Key Specifications at a Glance
1.5 liters (about 0.4 gallons)
Up to 16 hours on low mist setting
Rooms up to ~250 sq ft
Two levels: high and low
Whisper-quiet ultrasonic operation
Auto shut-off when tank is empty
Initial Setup
Setting up the MistAire takes only a few minutes. Follow these steps before first use:
- Remove the water tank by lifting it straight up off the base.
- Flip the tank over and unscrew the cap at the bottom.
- Fill the tank with cool, clean tap water (or distilled water for best results).
- Securely tighten the cap and place the tank back onto the base.
- Plug in the power adapter and press the mist control knob to start.
Pro tip: Use distilled or demineralized water if possible. Tap water contains minerals that can leave a fine white dust on nearby surfaces and shorten the life of the unit.
Using the Controls
The MistAire is refreshingly simple to operate. The single rotary knob on the front controls everything:
- Off: Knob fully counterclockwise.
- Low Mist: Slight clockwise turn — best for overnight use and small rooms.
- High Mist: Full clockwise turn — recommended for dry climates or larger spaces.
The optional night light has its own small button on the front. It emits a soft blue glow that's perfect for nurseries but unobtrusive enough for adult bedrooms.
Best Placement Tips
Where you put the humidifier makes a big difference in performance and longevity:
- Place it on a flat, water-resistant surface elevated off the floor — a nightstand, dresser, or table works well.
- Keep it 2–3 feet away from walls, electronics, and wood furniture to prevent moisture damage.
- Aim the 360° nozzle away from beds, bedding, and curtains.
- Avoid placing it in direct sunlight or near heating vents.
Pros and Cons
Pros
- Extremely quiet operation
- Compact, lightweight design
- No filter to replace
- Long runtime for the tank size
- Affordable price point
- Built-in night light is a nice bonus
Cons
- Tank size is small for large rooms
- No humidistat or auto humidity control
- Tank opening is narrow — cleaning requires the included brush
- Can produce white mineral dust with hard tap water
Cleaning and Maintenance
Regular cleaning is essential to keep your humidifier running well and to prevent mold or bacteria buildup. Pure Enrichment recommends cleaning the unit every 1–2 weeks with normal use. If low-maintenance germ control is a top priority, you might also consider the Honeywell HCM350W Germ Free Cool Mist Humidifier, which uses UV technology to kill bacteria in the water.
Weekly Cleaning
- Unplug the unit and empty any remaining water from the tank and base.
- Pour 1–2 cups of undiluted white vinegar into the tank. Let it sit for 20–30 minutes to effectively dissolve mineral deposits.
- Use the included cleaning brush to gently scrub the tank interior and the ultrasonic disc on the base.
- Rinse all parts thoroughly with clean water until the vinegar smell is gone.
- Dry with a soft cloth and reassemble.
Important: Never submerge the base unit in water and never use bleach, soap, or harsh detergents on the ultrasonic disc. These can damage the sensor and void your warranty.
Monthly Deep Clean
Once a month, perform a longer vinegar soak (up to an hour) to dissolve any mineral deposits, and pay extra attention to the small nozzle and base channels where buildup tends to accumulate.
Troubleshooting Common Issues
No Mist Coming Out
Check that the tank is properly seated on the base — there's a small valve that must press down to release water. Also confirm the water level isn't too low and that the ultrasonic disc is clean and free of mineral scale.
Unit is Leaking
Most leaks come from an over-tightened or under-tightened tank cap, or from overfilling. Make sure the rubber gasket inside the cap is seated properly and not damaged.
White Dust on Furniture
This is caused by minerals in tap water. Switch to distilled water to eliminate the issue almost entirely.
Gurgling or Unusual Noise
A small amount of bubbling is normal as air enters the tank. Loud or persistent noise usually means the unit isn't on a level surface or the disc needs cleaning.
Who Should Buy the MistAire?
The MistAire is an excellent fit for:
- Parents looking for a quiet humidifier for a nursery
- Anyone with a small bedroom or home office (under 250 sq ft)
- Allergy or cold sufferers seeking dry-air relief (though if you specifically want warm mist for congestion, the Vicks V745A Warm Mist Humidifier is a better match)
- Travelers or renters who need a compact, portable unit
If you need to humidify a large living room or an entire floor, you'll want to step up to a larger-capacity model like the Levoit LV600HH Hybrid Ultrasonic Humidifier or a whole-room option like the Honeywell HEV685W Cool Moisture Humidifier. If a smart-app-controlled model is more your style, the Dreo Smart Humidifier HM311S is worth a look. Otherwise, you can check the latest price on the MistAire here.
Frequently Asked Questions
Can I add essential oils to the MistAire?
No. Adding essential oils directly to the water tank can damage the plastic and the ultrasonic components. Pure Enrichment makes separate diffusers if you want aromatherapy.
How long does the MistAire last on one tank?
Up to 16 hours on the low mist setting and roughly 6–8 hours on high. Actual runtime varies based on room temperature, humidity level, and how well the tank seal is maintained.
Is it safe to leave on overnight?
Yes. The automatic shut-off feature turns the unit off when the tank runs dry, making it safe for unattended overnight use.
Does it have a humidistat?
No, the MistAire does not measure humidity levels. If you want precise control, pair it with a separate hygrometer or consider a model with a built-in humidistat such as the Levoit Classic 300S Smart Ultrasonic Humidifier or the Levoit LV600HH.
What's the warranty?
Pure Enrichment offers a 5-year warranty on the MistAire when you register the product, which is unusually generous for a humidifier in this price range.
Final Thoughts
The Pure Enrichment MistAire delivers reliable, quiet humidification at a price that's hard to beat. It's not designed for large spaces or hands-off humidity automation, but for a bedroom, nursery, or small office, it's a smart, low-maintenance choice. Stick to distilled water, clean it regularly, and it should give you years of comfortable, mist-filled nights.
