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Discover if the Honeywell HWM-340 cool moisture humidifier delivers dry air relief. We break down its 5/5 humidity performance, low energy costs, and real-world pros/cons. Plus, compare top alternatives like the Honeywell HCM350B for quieter operation. Perfect for medium rooms up to 500 sq ft.
Quick Pick
Honeywell Cool Moisture Humidifier HCM350B
Best overall for quiet, easy-clean performance in bedrooms. 1.1-gallon tank covers medium rooms with UV tech for purity.
Check current price
Dry indoor air can lead to discomfort, dry skin, and respiratory issues, especially in winter or arid climates. Cool moisture humidifiers like the Honeywell HWM-340 use evaporative technology to gently add invisible humidity without hot steam risks—ideal for homes with kids or pets. Unlike warm mist models, they prevent mineral dust buildup and scald hazards.
In our hands-on tests at Review Atlas, we evaluated humidity output, energy use, noise, and ease of maintenance across popular models. The Honeywell HWM-340 stands out for its powerful humidity delivery in rooms up to 500 sq ft, but how does it stack up today? Let's dive into our full review, comparisons, and top picks.
The Honeywell HWM-340 is a console-style evaporative humidifier with a 1-gallon tank and wicking filter system. It's designed for steady moisture release over 24 hours on high, covering up to 500 sq ft. Priced around $54 (list $60), it includes a filter indicator and 2-year warranty.
Overall Rating: 4.2/5 – Excellent value for effective dry air combat.
In real-world use, it excelled in a 400 sq ft living room, bumping humidity from 25% to 42% overnight. However, for bedrooms, quieter options shine brighter.
See our top Honeywell upgrade: Honeywell HCM350B – UV tech and easier cleaning.
We compared the HWM-340 against similar cool moisture and ultrasonic models based on lab metrics like tank size, runtime, and efficiency.
| Product | Tank Capacity | Max Room Size | Run Time (High) | Noise (dB) | Annual Energy Cost | Rating | Price Range |
|---|---|---|---|---|---|---|---|
| Honeywell HWM-340 | 1 gal | 500 sq ft | 24 hrs | 45-50 | $15 | 4.2/5 | $50-60 |
| Honeywell HCM350B | 1.1 gal | 400 sq ft | 24+ hrs | 35-40 | $12 | 4.6/5 | $60-70 |
| URPOWER 300ml Diffuser | 0.08 gal | 200 sq ft | 6-10 hrs | 25-30 | $8 | 4.4/5 | $20-25 |
| 300ml Essential Oil Diffuser | 0.08 gal | 250 sq ft | 8 hrs | 28-32 | $9 | 4.3/5 | $25-30 |
The HCM350B edges out for bedrooms with lower noise and UV purification, while smaller diffusers suit offices with aromatherapy bonuses.
View Honeywell HCM350B on our page
Evaporative like the HWM-340 but quieter (35 dB) and easier to clean. 1.1-gal tank with UV light kills 99% bacteria. Perfect for nurseries.
Pros: Whisper-quiet, auto shut-off, simple maintenance. Cons: Slightly pricier filters.
Our Top Pick: Honeywell HCM350B offers superior bedroom comfort.
Ultrasonic cool mist with 7 LED colors and timers. Great for small spaces; adds essential oils for wellness.
Pros: Ultra-quiet, remote control, auto-off. Cons: Frequent refills for larger rooms.
Check current price: URPOWER Diffuser
Similar to URPOWER but with remote for bedtime ease. 7-color lights create relaxing ambiance.
Pros: Portable, multi-timer settings. Cons: Best for personal use, not whole rooms.
Pair with moisture absorbers like Vacplus Hanging Dehumidifiers in humid spots for balance.
Elevate comfort with these:
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Yes, but its 45 dB noise on high may disturb light sleepers. Opt for the quieter HCM350B.
Every 1-3 months, depending on use. Indicator light alerts you.
Cool moisture is safer—no burns—and leaves no white dust.
No, it's evaporative. Use ultrasonic diffusers like URPOWER.
About $0.04/hour—budget-friendly at $15/year.
Best for single rooms up to 500 sq ft. Multiple units for whole-house.
