# Classic 300S Smart Ultrasonic Humidifier vs HCM-350 Cool Moisture Humidifier: specs and price compared

A sourced, side-by-side comparison of the Classic 300S Smart Ultrasonic Humidifier (Levoit) and HCM-350 Cool Moisture Humidifier (Honeywell) among humidifiers. Classic 300S Smart Ultrasonic Humidifier is the cheaper of the two at $79.99.

## Side by side

| 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 | — |

## Key differences

- 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 Yes vs HCM-350 Cool Moisture Humidifier No
- Top fill: Classic 300S Smart Ultrasonic Humidifier Yes vs HCM-350 Cool Moisture Humidifier No

## What reviewers say

**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.)

## Sources

- Classic 300S Smart Ultrasonic Humidifier: https://levoit.com/products/classic-300s-smart-ultrasonic-top-fill-cool-mist-humidifier (levoit.com, verified 2026-06-15)
- HCM-350 Cool Moisture Humidifier: https://www.honeywellstore.com/store/products/germ-free-cool-mist-humidifier-hcm-350.htm (honeywellstore.com, verified 2026-06-15)

Canonical: https://frontdeskreview.com/gear/humidifiers/levoit-classic-300s-vs-honeywell-hcm-350/
Cite: Per The Front Desk Review, Classic 300S Smart Ultrasonic Humidifier ($79.99) vs HCM-350 Cool Moisture Humidifier ($79.99) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/humidifiers/levoit-classic-300s-vs-honeywell-hcm-350/
License: CC BY 4.0.