Honeywell
Honeywell HEV620 Top Fill Tower
Honeywell's answer to the two complaints levelled at the HCM-350: no digital humidistat, and a tank you have to carry upside down to the sink. The HEV620 is a tower with a top-fill opening, a digital humidistat that will actually hold a target, and a timer. Its 300 sq ft claim against 2 gallons a day of output is the most conservative ratio in the entire catalog - the output supports closer to 490 - which is worth knowing if you have been talked out of it by a spec-sheet comparison against an ultrasonic promising 750.
The room-size claim, reconciled
493 sq ft supported · box says 300 sq ft
The 300 sq ft on the box is what the winter load calculation supports for this output — one of 18 units here whose claim lands within 5% of its own published rate.
Holding 300 sq ft takes about 1.22 gal/day, which drains this 1.7-gallon tank in roughly 34 hr — against the 24 hours Honeywell advertises, which is measured at the lowest setting.
What a year costs
HFT600 wick filter is about $17 and Honeywell asks for a change every one to three months in season. Electricity assumes the rated 40 W for 12 hours a day across a 150-day heating season at 16¢ per kilowatt-hour.
Specifications
A claim the maker makes
Honeywell says the filter is treated to inhibit up to 99.99% of mould growth on the filter itself. We quote it rather than repeat it: this site has not tested it and neither has anyone independent.
Maintenance profile
- Top fill
- Yes
- Replaceable media
- Wick, replaced through the season
Facts, not a score. Which of these matter depends entirely on whether the unit ends up somewhere you will actually clean it.
Features
- Digital humidistat that holds a target humidity
- Top-fill 1.7-gallon tank
- 2 gal/day output
- Timer and filter-change reminder
- Evaporative - no white dust
- HFT600 wick filter
Pros
- The one number on the box that undersells the machine - the output supports roughly 60% more room than Honeywell claims
- A real digital humidistat, so it stops when the room is where you asked for it
- Top filling solves the HCM-350's most-cited annoyance
- Tower footprint takes very little floor area for a 1.7-gallon tank
Cons
- Wick filters at about $17 every one to three months add up faster than the sticker suggests
- The tall narrow tank is hard to get a hand into for cleaning
- Owners report the humidistat reading a few points off a separate hygrometer
- Fan noise at the top setting is noticeable in a quiet bedroom
What owners say
Summarised from owner discussions and long-form owner reviews. Nobody here has used this unit.
The unit people buy when they have decided to get rid of their ultrasonics and want a target humidity rather than a dial. The most useful owner report on it is quantitative: in a 400 sq ft room, run on high, it raised relative humidity by about ten points in a few hours, and it did so quietly enough that the owner remarked on it.
The complaint attached to that same report is the humidistat, which reads about ten points away from an independent meter. Because the error is consistent it is workable — you learn the offset and set accordingly — but it means the auto mode is doing arithmetic on a number that is wrong. Pair it with a separate hygrometer and the problem disappears.
Worth knowing that its 300 sq ft figure is the most conservative claim in this catalog: two gallons a day actually supports around 490, so the box is underselling it by a considerable margin.
What owners like
- An owner moving off ultrasonics reports it lifting a 400 sq ft room by about 10 percentage points of relative humidity in a few hours on high, which is a real measured result rather than a claim
- Surprisingly quiet even at the top speed — audible, but described as not obnoxious, which is unusual for an evaporative at full tilt
- Top filling solves the complaint most often levelled at Honeywell's older bottom-fill units
- Its coverage claim is the most conservative in this catalog relative to what the output supports
Common complaints
- The built-in humidistat reads roughly ten points off a separate meter — consistently, so it can be worked around, but it cannot be trusted as an absolute
- Wick filters at around $17 every one to three months add up faster than the sticker suggests
- The tall narrow tank is hard to get a hand into for cleaning despite the top fill
- No app, no scheduling, and a display limited to the humidity setting
Questions owners ask
How much will it actually raise the humidity?
Is the humidistat accurate?
How does it sound for an evaporative?
What do the filters cost?
Honeywell HEV620 Top Fill Tower, head to head
Looked at alongside it
More from Honeywell →
The long-running default recommendation in this category, and the arithmetic explains why. Honeywell publishes 2.3 gallons a day against a 500 sq ft claim - a room that actually needs about 2 gallons a day - making this one of the only portable humidifiers in the catalog whose coverage number the physics supports outright. It has been on sale since 2011 largely unchanged, the tank and several parts go in the dishwasher, and it evaporates rather than atomises, so there is no white dust. The costs are a wick habit, a fan you can hear, and no humidistat at all: three speeds, and you are the humidistat.
567 sq ft supported · box says 500 sq ft
Honeywell
Honeywell HCM-710 Easy to Care
Take the HCM-350's mechanism, move the fill to the top, and make more of it dishwasher safe - that is the HCM-710 in one sentence, and "Easy to Care" is a fair name for it. The trade is capacity: a 1-gallon tank against the 350's 1.1, no UV, and no humidistat here either. At the 36 hours Honeywell claims it is moving two thirds of a gallon a day, which is a bedroom's worth; the 360 sq ft on the box would take closer to 1.5 gallons a day and drain the tank in about 16 hours.
165 sq ft supported · box says 360 sq ft
Honeywell's filter-free line exists because plenty of people would rather buy no consumables than buy the right ones. There is no wick and nothing to replace, which is genuinely the cheapest ownership in the catalog - and it is an ultrasonic with no demineralisation media, so on hard water the minerals that a wick would have caught end up on the furniture instead. A gallon tank and 24 hours works out to about a gallon a day, near enough to what its 300 sq ft claim needs, making this one of the more honest small ultrasonics on that particular number.
246 sq ft supported · box says 300 sq ft