Blueair InvisibleMist H35i vs Levoit Superior Studio Smart 450S
Levoit Superior Studio Smart 450S
The short answer
Blueair InvisibleMist H35i and Levoit Superior Studio Smart 450S finish almost level in our scoring (7.7 vs 7.6 out of 10), so the right pick depends on what you value most. Blueair InvisibleMist H35i is stronger on hygiene & ease of cleaning, health, safety & materials, ease of use and value. Levoit Superior Studio Smart 450S is stronger on humidifying performance and quiet & sleep-friendly. At current verified prices, the Levoit Superior Studio Smart 450S costs about $10.00 less.
- Choose the Blueair InvisibleMist H35i if: Bedrooms and medium rooms where the humidifier runs all winter and a low running cost matters more than reaching high humidity.
- Choose the Levoit Superior Studio Smart 450S if: Medium rooms where the owner will wash a wick weekly to avoid buying disposable ones. Evidence is still early.
Scores by criterion
| Criterion | Blueair InvisibleMist H35i | Levoit Superior Studio Smart 450S |
|---|---|---|
| Hygiene & Ease of Cleaning | 8.2Dishwasher-safe tank (Blueair), cleaning rated 5/5 (Bob Vila), and an auto-dry button. | 7.8Washable antimicrobial wick and top-fill (manufacturer claims). Dishwasher safety is unconfirmed. |
| Humidifying Performance | 7.0Plateaued near 51% RH and needed daily refills. | 7.5Fast 30%→60% RH in RTINGS's preliminary data, which is unconfirmed. |
| Quiet & Sleep-Friendly | 6.5TechGearLab measured 49.6 dB. Sleep mode is very quiet (Bob Vila). | 7.5Preliminary RTINGS range of about 31.7–45.3 dBA. The 19 dB figure is Levoit's. |
| Health, Safety & Materials | 8.0Evaporative with a BPA-free tank. UV and antimicrobial measures are manufacturer claims. | 7.6Antimicrobial claims come from the manufacturer only. Resin undisclosed. |
| Ease of Use | 8.0Top-fill, app control and auto mode. | 7.2Top-fill with app control, but RTINGS lists only a 14-hour runtime. |
| Value | 8.6$149.99 with the lowest measured running cost and $19.99 six-month wicks. | 7.8Low consumable cost if the 2-year wick claim holds. |
Specifications
| Spec | Blueair InvisibleMist H35i | Levoit Superior Studio Smart 450S |
|---|---|---|
| Humidifier type | Evaporative (pump-fed wick) | Evaporative (washable wick) |
| Water tank material | BPA-free plastic (Blueair) | Antimicrobial-treated water-contact surfaces (resin not disclosed) |
| Tank capacity | 3.5 L | 4.5 L |
| Max runtime per tank (manufacturer) | 48 hours | 40 hours |
| Rated room coverage | 500 sq ft | 600 sq ft |
| Noise (manufacturer-rated or lab-measured) | 49.6 dB | 45 dB |
| Top-fill tank | Yes | Yes |
| Requires replaceable filter/cartridge | Yes | Yes |
| Built-in humidistat / auto mode | Yes | Yes |
| Built-in night light | No | No |
| Built-in white-noise / sound machine | No | No |
| Dishwasher-safe water-contact parts | Yes | — |
| Mist temperature | Cool (invisible vapor) | Cool (invisible vapor) |
| Wi-Fi app / voice control | Yes | Yes |
| White dust / mineral dispersal risk (per EPA type guidance) | Low – evaporative (EPA: not expected to disperse substantial minerals) | Low – evaporative (EPA: not expected to disperse substantial minerals) |
| Wick replacement interval / cost | Every 6 months; $19.99 (Blueair) | Washable wick rated up to 2 years with weekly washing; replacement $24.99 (Levoit press release) |
| Antimicrobial / UV measures | UV-integrated pump; antimicrobial wick (manufacturer claims) | Manufacturer claim: EPA-registered antimicrobial wick and surfaces; ASTM G21 Grade 0 (Levoit) |
| Warranty | 1 years | 2 years |
Blueair InvisibleMist H35i
Pros
- Lowest measured operating cost in TechGearLab's test
- Dishwasher-safe, BPA-free tank
- Top-fill design with smart controls
- Inexpensive wicks every 6 months
- Warranty extends to 3 years with registration
Cons
- Plateaued near 51% RH in lab testing
- Bob Vila's testers refilled it daily to hold about 45% RH
- 49.6 dB constant fan noise
- Blueair also sells an H35i G2, so check the model before buying
A smart, low-cost choice for a bedroom or medium room where the humidifier runs all winter. Expect modest humidity gains and audible fan noise, in exchange for easy cleaning and cheap running costs.
Full Blueair InvisibleMist H35i review →Levoit Superior Studio Smart 450S
Pros
- Washable wick rated up to 2 years
- Fast humidity gain in RTINGS early data
- Mid-priced for a 4.5 L top-fill unit
- Smart controls and auto humidity
- 2-year warranty
Cons
- No full independent review yet
- 14-hour runtime in RTINGS data versus 40 hours claimed
- Wick life assumes weekly washing
- Tank material not disclosed
An interesting low-waste option with promising early numbers. Wait for full reviews if you can, or buy it knowing the claims come mostly from Levoit.
Full Levoit Superior Studio Smart 450S review →Both products are part of our guide The Best Evaporative Humidifiers (No White Dust) of 2026, where you can see every pick, how we score and current prices from each retailer.