About
About MistRanker
The square footage on a humidifier carton is the one number in the category that nobody has to prove — and of the 45 units here that publish enough to check, 26 are claiming a room bigger than their own output can hold.
One number, recomputed 50 times
AHAM certifies and publishes directories for room air cleaners, dehumidifiers and room air conditioners. It publishes no directory of certified humidifiers. There is a test method, HU-1, that a maker may measure against if it chooses, and not one unit in this catalog says it did. So the coverage figure is the maker’s own, unrefereed, and it is usually generous.
MistRanker replaces it with arithmetic anyone can redo. A house loses moisture at the rate it exchanges air with a cold outdoors, which works out to about 246 square feet held per gallon per day at 8-foot ceilings and 0.5 air changes an hour. Divide a unit’s published output by that and you get the room it can really keep at 40%. Across the catalog the median carton runs 1.21× past that figure; the widest gap belongs to the HoMedics TotalComfort Deluxe Warm & Cool at 5.4×. It runs the other way too, which is worth saying plainly: 14 units claim less room than their output supports, the Vicks Warm Mist Humidifier V745A by 49%. Both numbers appear on every unit page, one above the other, so the gap is the thing you read rather than a conclusion you are handed. The derivation and every assumption inside it are on the spec-sheet page, written so a reader can disagree with one line of it instead of the whole thing.
How a humidifier gets classified here
Mechanism first, because it settles three arguments at once: white dust, what you buy every year, and how the tank gets cleaned. The catalog splits into 6 types — ultrasonic, evaporative, warm mist / steam, hybrid, console evaporative and whole-house — and a unit sits in the one that describes how it actually makes moisture, not the one its packaging leads with. Only ultrasonic and hybrid units can atomise minerals into a room, which is why 35 of the 50 here are physically incapable of white dust whatever you fill them with, and the site treats that as a fact about the mechanism rather than a feature bullet.
Output, tank size, wattage, noise floor, dimensions and media come from each maker’s own product page, manual or spec sheet, and every unit records the documents it was built from. Where a maker publishes a runtime claim but no output rate, the rate is computed from the tank and that claim, and the unit is labelled derived rather than passed off as published — 21 of them carry that label today against 27 that state a rate outright.
What owners say, and how it is marked
34 of the 50 units carry an owner summary: public owner discussion and long-form owner write-ups, read and condensed, with the pattern of complaint kept intact rather than smoothed. Those pages say what fails after a season — the wick that smells, the tank that will not take a hand, the humidistat that reads six points high — because that is what a spec sheet structurally cannot tell you.
The other 16 show a note saying no owner summary has been collected, and 9 unit write-ups are marked as built from specifications alone. The label is the point: sentiment is only claimed where sentiment was actually read. Nobody here ran a humidifier on a scale, there is no lab, no panel and no hands-on trial, and no page on this site pretends otherwise.
What stays blank
A field nobody publishes is left empty. That is the whole policy, and it costs the site something on every page it appears. 2 units publish no output rate in any form, so their supported room size is blank rather than guessed from a comparable model. 50 of 50 units show no star rating, because a rating only appears with a named non-Amazon source beside it and retailer review pages refuse automated access — a rating with nothing to point at is worse than none. There are no engagement counts, no discussion totals, no aggregate scores invented to fill a column, and no maker’s germ-kill or sterilisation claim repeated as though it were a measurement: where one exists it is quoted and attributed to the maker.
Two people, and no humidity chamber
Two people, in a house that runs two humidifiers all winter. No office, no test chamber, no editorial staff and no roster of experts. Nothing on this site is a paid placement, no money changes hands with any manufacturer, and no brand has any influence over whether it appears or where it ranks — the ordering rule inside every hub and guide is printed at the top of that page, and it is always a real number rather than a score we invented.
The site carries no retailer links at all: no buy buttons, no affiliate tags, no advertising. Prices are approximate snapshots from the last catalog refresh, shown with a ~ so nobody mistakes them for a live quote, and no link here ends at a checkout. The full accounting is on how we compare and privacy.
Seasonal pricing, and quiet spec revisions
The catalog was last refreshed on September 24, 2026, and that date is the one the sitemap reports — it moves when the data moves and not before. Refreshes are periodic rather than continuous: models get discontinued, seasonal pricing swings hard between August and January, and makers quietly revise their own coverage numbers without announcing it. A specification that has changed since the last pass is a correction worth sending, and the contact page exists mostly for that.