Cost
Whole house cost, against the portables it replaces
The install is the number everyone quotes. The interesting arithmetic is what happens afterwards, when one machine with no reservoir replaces three with tanks that have to be emptied daily.
By Scooter M. · Published · Updated
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| # | Product | Best for | Gal/day | Price |
|---|---|---|---|---|
| 1 |  Aprilaire Model 700Top pickEighteen gallons a day against a stated 5,300 sq ft, cited to AHRI Guideline F. It is ducted, it needs installing, and it is the only sizing claim here with a standard behind it. | An actual whole house, sized against a standard | 18.0published · 5,328 sq ft | |
| 2 |  Levoit Superior 6000SSix gallons, evaporative, and a Dry Mode that dries the wicks between runs. The 3,000 sq ft claim needs five times the output its own run time implies. | Mist-free humidification with a drying cycle | 2.0implied · 592 sq ft | |
| 3 |  AIRCARE MA0800 Mini-ConsoleA 2.5-gallon evaporative console with three fan speeds, an adjustable humidistat and a MAF2 SuperWick. Its 2,600 sq ft claim is far beyond what its own tank and run time imply, so size it as a large room rather than a floor. | A plug-in console with its own humidistat | 1.7implied · 493 sq ft |
We are going to be straight about the limits of this page up front. We cannot tell you what a whole-house humidifier costs to install, because installed HVAC pricing is local, quoted, and varies with the state of your plenum and your plumbing. Anybody publishing a national figure for it is estimating. What we can do is the part nobody does: the ownership arithmetic after the install.
We earn a commission if you buy through the links on this page, at no extra cost to you. It does not change what we recommend or the order the picks appear in. Full disclosure. Prices checked October 16, 2026.
| # | Product | Best for | Gal/day | Price |
|---|---|---|---|---|
| 1 | Aprilaire Model 700Top pickEighteen gallons a day against a stated 5,300 sq ft, cited to AHRI Guideline F. It is ducted, it needs installing, and it is the only sizing claim here with a standard behind it. | An actual whole house, sized against a standard | 18.0published · 5,328 sq ft | |
| 2 | Levoit Superior 6000SSix gallons, evaporative, and a Dry Mode that dries the wicks between runs. The 3,000 sq ft claim needs five times the output its own run time implies. | Mist-free humidification with a drying cycle | 2.0implied · 592 sq ft | |
| 3 | AIRCARE MA0800 Mini-ConsoleA 2.5-gallon evaporative console with three fan speeds, an adjustable humidistat and a MAF2 SuperWick. Its 2,600 sq ft claim is far beyond what its own tank and run time imply, so size it as a large room rather than a floor. | A plug-in console with its own humidistat | 1.7implied · 493 sq ft |
What the ducted unit replaces
Start from capacity, because that is what makes this a real comparison rather than a preference. The Aprilaire 700 publishes 18 gallons a day against a stated 5,300 square feet, cited to AHRI Guideline F. The largest published portable output in our set is the Vornado Evap40 at 4 gallons a day. To find your own figure, use the whole house sizing chart.
The consumable comparison
| Approach | Consumable | Count per season |
|---|---|---|
| Aprilaire 700, ducted | Model 35 Water Panel | 1 to 2 (Aprilaire's own stated schedule) |
| 4 x Canopy at 45-day intervals | Antimicrobial filter | 16 |
| 4 x evaporative portables | Wicks | Unknown - none of those makers publishes an interval |
One or two consumables against sixteen, for the only pair where both makers actually publish an interval. That is an order of magnitude, and it is not marketing: it follows from the mechanism. A ducted unit is plumbed to the supply and drains to waste, so mineral-laden water leaves the building instead of accumulating in a wick. Its Water Panel is doing far less capture work per gallon evaporated. The mechanism is compared in detail on wick vs water panel, and which panel fits which model on furnace humidifier pad replacement.
The maintenance comparison
| Task | Ducted | Four portables |
|---|---|---|
| Daily refill | None - plumbed | 4 tanks, every day, for 182 days |
| Daily empty and dry | None - no reservoir | 4 units, every day (the EPA's instruction) |
| Every-third-day clean | None | 4 units, about 60 times a season |
| Descaling | None - it drains | 4 units, as your water demands |
| Consumable changes | 1 to 2 a season | 16 or more |
The electricity is a wash
The Aprilaire 700 runs on a 24 VAC transformer and its draw is negligible against household heating. Four cool-mist portables at 26 to 30 watts each, running continuously through a season, come to around a hundred dollars at the US average rate of 18.34 cents per kWh. Neither figure is going to decide this purchase, and we would rather say so than dress it up as a saving.
What you are actually buying, and what disqualifies you
The genuine advantages are capacity, distribution and the absence of a reservoir. The genuine costs are the install and the constraints, and the constraints are absolute rather than negotiable:
- You need ducted forced-air heating. Radiators, hot-water baseboard, mini-splits and electric panel heaters all disqualify you outright. There is no air stream to humidify.
- You need a water supply and a drain within reach of the plenum.
- You probably need an installer, unless you are comfortable cutting an opening in a furnace plenum and making a saddle-valve connection.
- You need to own the house.
- It only humidifies while air is moving. On a mild day when the furnace barely cycles, it barely runs. A portable does not care what the heating is doing.
- It wastes water. The drain that keeps it clean sends water down it.
The middle option people forget
A console. The AIRCARE MA0800 in our picks is a 2.5-gallon evaporative unit with three fan speeds and an adjustable humidistat, and the Levoit Superior 6000S is a 6-gallon collapsible one with a drying mode. Neither approaches 18 gallons a day on published figures, but both move more water than a typical bedroom unit, and neither needs a plumber, a duct or a landlord's permission.
If your requirement is in the six-to-twelve-gallons-a-day band, a console or two is very often the right answer, and it is the answer nobody sells you because there is no install margin in it. The capacity decision is laid out on whole house vs room.
The picks, in full
Top pick · An actual whole house, sized against a standard
Aprilaire Model 700
Eighteen gallons a day against a stated 5,300 sq ft, cited to AHRI Guideline F. It is ducted, it needs installing, and it is the only sizing claim here with a standard behind it.
This is the reference point for the whole site. Aprilaire is the only maker in our set that publishes a capacity in gallons per day and a coverage in square feet together, and cites the residential sizing standard as the basis for pairing them. Three of its models do it consistently: 12 gal/day to 3,600 sq ft, 17 to 5,000, and 18 to 5,300. Those three pairs are where our 296 square feet per gallon per day comes from.
Everything else follows from the fact that it drains. There is no reservoir, so there is no standing water, so the pink film and the mold that dominate portable-humidifier ownership simply do not arise. The Water Panel goes once or twice a heating season instead of a wick every 30 to 60 days, which changes the recurring cost by an order of magnitude.
The honest counterweight is that this is not a purchase, it is a project. It mounts in ductwork, it needs a water line and a drain, it needs a humidistat and an outdoor sensor, and unless you are comfortable cutting into a plenum it needs a contractor. Our whole-house cost page works through the break-even against running several portables.
What works
- The only sizing claim in this set with a published standard behind it
- No reservoir, so no standing water and none of the maintenance that follows from it
- Water Panel changed once or twice a season instead of a wick every month or two
What does not
- Requires ducted forced-air heating, a water supply, a drain and, realistically, an installer
- Installed cost is a different order of magnitude from any portable here
- Wastes water: the drain design that keeps it clean also sends water to waste
Skip this ifyou rent, or you heat with anything other than a ducted forced-air system. Neither is a fixable objection.
The arithmetic
- Published output (continuous)
- 18.0 gal/day
- Covers, at 296 sq ft per gal/day
- 5,328 sq ft
- Maker’s coverage claim
- 5,300 sq ft
- Output that claim would need
- 17.9 gal/day
Output as the manufacturer publishes it. Coverage rate derived from Aprilaire’s own published capacity-and-coverage pairs.
Published specification
- Tank
- not publishedThere is no tank. It is plumbed to the water supply and drains to waste.
- Output/day
- 18 gal/daySource
- Coverage
- Up to 5,300 sq ftAprilaire states this for tightly constructed homes and cites AHRI Guideline FSource
- Power
- 24 VAC via the supplied transformerSource
- Filter
- Model 35 Water PanelAprilaire's maintenance page puts this on an annual schedule, plus an annual distribution-tray inspection. Its product page says once or twice per heating season; the two documents differ and we take the more specific one. Either way it is by far the longest interval of any unit here.Source
- Cleaning
- Built-in drain flushes mineral build-upWater does not stand inside the unit, which removes the standing-water problem entirelySource
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Pick 2 · Mist-free humidification with a drying cycle
Levoit Superior 6000S
Six gallons, evaporative, and a Dry Mode that dries the wicks between runs. The 3,000 sq ft claim needs five times the output its own run time implies.
Six gallons over 72 hours is two gallons a day, which covers about 590 square feet. The box says 3,000. To actually hold humidity across 3,000 square feet this unit would need to move a little over ten gallons a day, and at that rate its six-gallon reservoir would run dry in about fourteen hours. Both numbers describe the machine; only one describes it at a time, and the maker publishes no figure that reconciles them.
Dry Mode is the genuinely good idea here and it deserves credit. A wet wick sitting in a warm room is the substrate for everything the EPA warns about, and a fan cycle that dries the wicks between runs attacks that problem directly rather than adding an antimicrobial coating and hoping. It also extends wick life, which is the recurring cost.
Thirty watts to move two gallons a day is efficient, and mist-free operation means the minerals stay in the wicks rather than settling on your furniture. If you can live with a coverage claim you should mentally divide by five, this is a well-made machine.
What works
- Dry Mode addresses the real failure mode of evaporative units instead of masking it
- Mist-free, so no white dust whatever your water is like
- 30 W for six gallons of capacity, with noise published at both ends of the range
What does not
- The 3,000 sq ft claim is about five times what the published tank and run time imply
- Four wicks to replace, on an interval Levoit does not publish
- 45 dB at the top of the fan range is audible in a quiet bedroom
Skip this ifyou bought it for the 3,000 sq ft number. Size it at around 600 square feet on the setting whose run time Levoit actually publishes.
The arithmetic
- Implied output (low fan speed)
- 2.0 gal/day
- Covers, at 296 sq ft per gal/day
- 592 sq ft
- Maker’s coverage claim
- 3,000 sq ft
- Output that claim would need
- 10.1 gal/day
Output derived as tank capacity divided by published run time, times 24. Coverage rate derived from Aprilaire’s own published capacity-and-coverage pairs.
Published specification
- Tank
- 6 gal / 22.7 LSource
- Output/day
- not published
- Coverage
- 3,000 sq ft / 279 m23,000 sq ft needs about 10.1 gal/day at our derived rate. Its published tank and run time imply 2.0.Source
- Run time
- Up to 72 hOn the low fan speedSource
- Power
- 30 WSource
- Noise
- 28-45 dBSource
- Filter
- Four wick filters, pre-installedReplacements are sold by Levoit as a four-pack. No replacement interval is published.Source
- Cleaning
- Dry ModeLevoit's own wording: low and high fan speeds dry out the elevated wick filters, extending filter lifeSource
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Pick 3 · A plug-in console with its own humidistat
AIRCARE MA0800 Mini-Console
A 2.5-gallon evaporative console with three fan speeds, an adjustable humidistat and a MAF2 SuperWick. Its 2,600 sq ft claim is far beyond what its own tank and run time imply, so size it as a large room rather than a floor.
Two published figures that describe opposite ends of the machine, and none of the numbers that would join them up. A 2.5-gallon tank lasting 36 hours is about 1.67 gallons a day, or roughly 493 square feet at our derived rate. Covering the claimed 2,600 square feet would take about 8.8 gallons a day, at which rate the same tank empties in under seven hours.
Both can be true at once: 36 hours is AIRCARE's maximum run time, which will be the lowest of the three fan speeds, and 2,600 square feet will be the highest. It can certainly move more than 1.67 gallons a day on a higher speed. AIRCARE does not say how much more, so its own published data supports sizing it as a large room, not a whole floor.
What it has that most units in our set do not is an adjustable humidistat with digital controls, stated on AIRCARE's own page. On an evaporative machine, which already slows down as the air approaches saturation, that is a second brake against overshooting - and the MAF2 SuperWick keeps your tap water's minerals out of the air.
What works
- Adjustable humidistat and digital controls, per AIRCARE's own specification
- Evaporative SuperWick captures minerals, so no white dust
- Three fan speeds to trade output against noise
What does not
- No published output figure anywhere on the manufacturer page
- The 2,600 sq ft claim and the 36-hour run time cannot both describe the same setting
- No published noise figure, wattage or wick replacement interval
Skip this ifyou want to humidify a whole floor on the strength of the box. Its own tank and run time support a large room, not 2,600 square feet.
The arithmetic
- Implied output (maximum published run time)
- 1.7 gal/day
- Covers, at 296 sq ft per gal/day
- 493 sq ft
- Maker’s coverage claim
- 2,600 sq ft
- Output that claim would need
- 8.8 gal/day
Output derived as tank capacity divided by published run time, times 24. Coverage rate derived from Aprilaire’s own published capacity-and-coverage pairs.
Published specification
- Tank
- 2.5 galSource
- Output/day
- not publishedAIRCARE's page gives a tank capacity and a maximum run time, but no daily output.
- Coverage
- Up to 2,600 sq ft2,600 sq ft needs about 8.8 gal/day at our derived rate. AIRCARE publishes no output figure, so the claim cannot be checked against its own data.Source
- Run time
- Up to 36 hAIRCARE's maximum run time, which will describe the lowest of its three fan speedsSource
- Power
- not published
- Filter
- MAF2 SuperWickAIRCARE publishes no replacement intervalSource
- Cleaning
- Evaporative wick holds minerals back from the roomAdjustable humidistat and digital controls, per AIRCARESource
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Questions people actually ask
How much does a whole house humidifier cost?
We do not publish an installed price, because HVAC installation is quoted locally and varies with your plenum, your plumbing and your contractor. Anybody giving you a national figure is estimating. What we can tell you is the ownership cost: one to two Water Panels per heating season for the Aprilaire 700, against sixteen filters for four Canopy portables at their published 45-day interval.
Are whole house humidifiers cheaper than portable ones?
Far cheaper to run and maintain, once installed. The Aprilaire 700 uses one or two Water Panels a heating season and has no reservoir to empty, clean or refill. Four portables of equivalent capacity would need about 730 individual acts of maintenance across the same season.
How many portable humidifiers equal a whole house unit?
About four and a half, on published output. The Aprilaire 700 publishes 18 gallons a day; the largest published portable output in our set is 4 gallons a day from the Vornado Evap40. That means four or five tanks filled daily and four or five wicks on a schedule.
Can you install a whole house humidifier yourself?
It requires cutting an opening in a furnace plenum, making a water connection, running a drain and wiring a 24 VAC transformer and humidistat. Some people are comfortable with all of that; most are not, and getting the plenum opening wrong is expensive.
Do whole house humidifiers work with any heating system?
No. They need ducted forced-air heating to put moisture into. Hot-water baseboard, radiators, mini-splits and electric panel heating all rule it out, and none of those is a fixable objection.
Sources
Every figure on this page came from one of the documents below, read on the date shown. We do not cite other review sites, forum posts or video reviews as sources of fact.
- Aprilaire Model 700 - manufacturer spec page (retrieved September 1, 2026)
- Aprilaire Model 400 - manufacturer spec page (retrieved September 1, 2026)
- Aprilaire Model 500 - manufacturer spec page (retrieved September 1, 2026)
- Canopy Humidifier - manufacturer spec page (retrieved September 1, 2026)
- Vornado Evap40 - manufacturer spec page (retrieved September 1, 2026)
- AIRCARE MA0800 Mini-Console - manufacturer spec page (retrieved September 17, 2026)
- Levoit Superior 6000S - manufacturer spec page (retrieved September 1, 2026)
- US Energy Information Administration - Electric Power Monthly, Table 5.3: average residential price 18.34 cents per kilowatthour, United States, June 2026
Read next
The capacity decision
Whole house vs room humidifier
When a ducted whole-house unit is genuinely the right answer, when several portables win, and the arithmetic that decides it.
Top pick: Aprilaire Model 700 · 18.0 gal/day
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Whole house
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How ducted whole-house humidifiers work, the drainage advantage that changes their maintenance entirely, and the requirements that rule most people out.
Top pick: Aprilaire Model 700 · 18.0 gal/day
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Consumables
Wick vs Water Panel
Why a ducted Water Panel lasts a heating season and a portable wick lasts weeks, and what that mechanism means for cost of ownership.
Top pick: Aprilaire Model 700 · 18.0 gal/day
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Ducted comparison
Bypass vs fan-powered humidifiers
The whole-house decision most installers make for you, with both sides on their maker's own published figures - and the operating difference nobody mentions until winter.
Top pick: Aprilaire Model 500 · 12.0 gal/day
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2,000 sq ft
What size humidifier for 2,000 square feet?
The arithmetic for a 2,000 sq ft house, why no portable meets it, and the three real options: ducted, several machines, or humidifying only the rooms you use.
Top pick: Aprilaire Model 700 · 18.0 gal/day
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Best without ducts
Best humidifiers when you have no ductwork
The honest options for a house with no forced-air ductwork: what the largest portables actually deliver, why no machine is really a whole-house unit, and how to cover a house with two or three of them.
Top pick: Vornado Evap40 · 4.0 gal/day
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Reviewed
Aprilaire 700 review
A full review of the fan-powered Aprilaire 700: the 18 gal/day claim with AHRI Guideline F behind it, what its own fan buys over a bypass unit, why the drain removes the problem that defines portable humidifiers, and the cost nobody quotes.
Top pick: Aprilaire Model 700 · 18.0 gal/day
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Found a number that is wrong? Tell us and we will fix it and say so. How we pick shows every formula used on this page.