Levoit
Classic 300S Smart Ultrasonic Humidifier
$79.99
Released 2022
Best Humidifiers · head-to-head
Classic 300S Smart Ultrasonic Humidifier vs HCM-350 Cool Moisture Humidifier
A sourced, side-by-side comparison. Classic 300S Smart Ultrasonic Humidifier is cheaper at $79.99. Every spec and price links to its source.
Honeywell
HCM-350 Cool Moisture Humidifier
$79.99
Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Classic 300S Smart Ultrasonic Humidifier | HCM-350 Cool Moisture Humidifier |
|---|---|---|
| US price | $79.99 | $79.99 |
| Brand | Levoit | Honeywell |
| Released | 2022 | — |
| Type | ultrasonic | evaporative |
| Tank capacity liters | 6 | 4.16 |
| Coverage (sq ft) | 505 | 500 |
| Runtime hours | 60 | 24 |
| Smart Wi-Fi | Yes | No |
| Top fill | Yes | No |
| Noise dba | 30 | — |
Sources — Classic 300S Smart Ultrasonic Humidifier: levoit.com (verified 2026-06-15). HCM-350 Cool Moisture Humidifier: honeywellstore.com (verified 2026-06-15).
What's the difference between the Classic 300S Smart Ultrasonic Humidifier and HCM-350 Cool Moisture Humidifier?
Where the two actually differ on the specs we track (6 of 7). Matching specs are omitted.
- Type: Classic 300S Smart Ultrasonic Humidifier ultrasonic vs HCM-350 Cool Moisture Humidifier evaporative
- Tank capacity liters: Classic 300S Smart Ultrasonic Humidifier 6 vs HCM-350 Cool Moisture Humidifier 4.16
- Coverage (sq ft): Classic 300S Smart Ultrasonic Humidifier 505 vs HCM-350 Cool Moisture Humidifier 500
- Runtime hours: Classic 300S Smart Ultrasonic Humidifier 60 vs HCM-350 Cool Moisture Humidifier 24
- Smart Wi-Fi: Classic 300S Smart Ultrasonic Humidifier true vs HCM-350 Cool Moisture Humidifier false
- Top fill: Classic 300S Smart Ultrasonic Humidifier true vs HCM-350 Cool Moisture Humidifier false
What reviewers say
Sourced tester consensus for each — the "what people who used it think" layer, not just specs.
Classic 300S Smart Ultrasonic Humidifier
Only one whitelisted tester yielded a readable, hands-on review: Wirecutter names the Classic 300S its humidifier runner-up, calling it nearly as powerful and reliable as its Levoit LV600S top pick with a handy night-light, but flags an unintuitive icon-only interface, tricky cleaning, and reports of tank leaks. RTINGS (paywalled) and TechGearLab (site maintenance) were unreadable and discarded. (1 sourced review, 1 lab-tested.)
Praised: Nearly as powerful and reliable as Wirecutter's top-pick LV600S, and similarly avoids over-humidifying the room; Pleasant built-in night-light that is easy to turn off without stopping humidification; Same smart-home features and same two-year warranty as the top pick.
Flagged: Icon-only onboard buttons are less intuitive and harder to navigate than the top pick's labeled buttons; Reports of the tank leaking after a few months of use (Amazon reviewers and Wirecutter staffers); Harder to clean than the top pick due to the awkward water-vapor chimney and complex basin water channel.
HCM-350 Cool Moisture Humidifier
No sourced tester review yet.