APRILAIRE · WHOLE-HOME HUMIDIFIERSThe AprilAire space at AirGreenThe AprilAire humidifiers we sell, data checked in AprilAire’s spec sheets, installed by AirGreen in Montreal, Laval, Longueuil, the South Shore and the North Shore.

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AprilAire · whole-home humidifiers · updated October 20, 2026

AprilAire humidifiers: the right model depends on your house

AprilAire has made whole-home humidifiers since 1954. AirGreen sells seven: bypass (400, 500, 600), fan-powered (700), steam (800, 865) and self-contained (300). Three things decide the model: your ductwork, your drain and your electrical circuit.

Request a quote See AprilAire products

1954AprilAire’s first whole-home humidifier

34.6 gal/day800 and 865 at 240 V, 16 A

No drainfor the AprilAire 400

5 yearsAprilAire parts warranty

Find your AprilAire in 3 questions

1. Does the house have a forced-air furnace (ductwork)?

2. Is there a drain near where it would go?

3. Can the panel take a 240 V circuit?

The most output: the 800 steam unit

With a drain and a 240 V circuit, the 800 gives up to 34.6 gal/day (16 A), and its output does not depend on how warm the plenum air is. The water-panel models remain options: 600 (17 gal/day) or 700 (18).

AprilAire 800up to 34.6 gal/day at 240 V

AprilAire 70018 gal/day

AprilAire 60017 gal/day

A first pass, not a quote: our estimator confirms the model on site.

AirGreen × APRILAIRESold and installed by AirGreenBypass · fan-powered · steamUp to 34.6 gal/day (800 and 865 at 240 V)Whole-home humidifiers since 1954Montreal · Laval · Longueuil · South Shore · North Shore

01 The 500 → 865 ladder

What each step adds

Tap a model: its output, what it needs in your house and what it adds over the one before. The 400 is not “above” the 600: it does the same job without a drain. The 300 sits apart, for homes without forced air.

AprilAire 600

17 gal/day

120 °F plenum, blower running, cold water

Compared with the 500: 5 more gal/day (17) and up to 5,000 sq ft instead of 3,600 in a tight home. A 10 × 12¾ in. opening, the same 6 in. bypass duct. It still needs a drain, and AprilAire recommends a hot-water connection.

Type: Bypass, large
Area per AprilAire: Up to 5,000 sq ft in a tight home
Water and drain: Drain required (3 gal/h water feed); hot water recommended
Electrical: 24 V, 0.5 A
Control supplied: Model 60, automatic
Consumable: Water Panel 35, once per season

See the AprilAire 600 page

The areas are the ones AprilAire publishes for a tight home. AprilAire rates its water-panel models with a 120 °F plenum, the blower running and cold water; its 700 submittal notes that a cooler plenum can reduce evaporative capacity.

02 Steam: 800 and 865

With steam, the electrical circuit sets the output

The 800 and 865 boil water in an electrode canister. Pick the voltage and current: the output comes from AprilAire’s table (spec sheet 01.26).

Voltage

Current

34.6 gal/day

240 V and 16 A: 3.8 kW according to AprilAire.

800 / 865

34.6 gal/d

700

18 gal/d

600

17 gal/d

500

12 gal/d

The water-panel models (700, 600, 500) are rated with a 120 °F plenum: their real output can drop when the air is cooler. The 800 or 865 setting is chosen at the quote stage to suit your electrical panel.

AprilAire’s table

Voltage	11.5 A	16 A
120 V	11.5 gal/d · 1.4 kW	16 gal/d · 1.9 kW
208 V	20.5 gal/d · 2.4 kW	30 gal/d · 3.3 kW
240 V	23.3 gal/d · 2.8 kW	34.6 gal/d · 3.8 kW

Cold water only, conductivity 125 to 1,250 µS/cm, pressure 25 to 120 psi; the 800LC is made for softer water.

AirGreen × APRILAIRE

AprilAire’s humidifier, AirGreen’s installation.

AprilAire designs a humidifier for each kind of house and publishes its outputs. AirGreen looks at your ducts, your drain, your water and your panel, then installs it. Each does what it does best.

What AprilAire brings

Seven units, four familiesBypass (400, 500, 600), fan-powered (700), steam (800, 865) and self-contained (300).
Published outputsIn gallons per day, model by model, and for steam, by voltage and current.
The control in the boxModel 60, 62 or 65 depending on the unit.
5-year parts warrantyFrom installation, no labour, as AprilAire writes it.

What AirGreen brings

Sold and installed by AirGreenIn Montreal, Laval, Longueuil, the South Shore and the North Shore.
Free in-home estimateWe look at your ducts, your drain, your water and your electrical panel on site.
Price on quotationFor the unit and its installation.
RBQ 5645-9605-01Subclasses 15.8, 15.10 and 16.

The result: the right AprilAire for your house, chosen with you and installed by AirGreen.

Find my model Book my free estimate

03 Installation

What each model needs in your house

Ducts, drain, water, power: the quote starts from these four points. Data from AprilAire’s 2022 to 2026 spec sheets and its 2012 application guide.

Model	Forced air	Bypass duct	Drain	Water	Electrical
AprilAire 500	Yes	Yes, 6 in.	Yes	Cold or hot (hot water exceeds the rated output)	24 V
AprilAire 600	Yes	Yes, 6 in.	Yes	Hot water recommended	24 V
AprilAire 400	Yes	Yes, 6 in.	No	Cold (hot water adds little)	24 V
AprilAire 700	Yes	No	Yes	Cold or hot, 140 °F maximum; hot required if mounted on the return (2012 guide)	120 V, 0.8 A + 24 V
AprilAire 800	Yes (steam into the duct)	No	Yes, 7/8 in.	Cold only	120, 208 or 240 V
AprilAire 865	No	No	Yes	Cold only	120, 208 or 240 V
AprilAire 300	No	No	Confirmed on site	Hot required, 120 to 140 °F	120 V, 0.7 A

No drain?

Among the forced-air models, only the 400 does without one: it uses all the water it takes in.

No ducts?

The 865 (steam, wall fan pack) or the 300 (self-contained evaporative, hot water) humidify a house with no forced-air furnace.

Tight space around the plenum?

The 700 has no bypass duct; the 500 needs the smallest opening (9½ × 9½ in.).

04 Controls

Four controls, each matched to its unit

The “M” versions of the 400 to 700 (not sold by AirGreen) come with the 4655 manual control, set from 15 to 45%.

Model 60

Automatic and digital. Supplied with the 400, 500, 600 and 700. Setting from 10 to 45% relative humidity.

See the page

Model 62

Automatic and digital: the control for the 800 steam unit, per AprilAire’s Model 60 and 62 instructions.

Supplied with the unit

Model 65

Digital manual, set from 10 to 50% relative humidity. Supplied with the 865 and the 300.

Supplied with the unit

Model 76

Digital wall control for AprilAire dehumidifiers (E070, E080, E100, E130).

See the page

05 Upkeep

A water panel or a canister: upkeep depends on the family

Water-panel models need a new panel; steam models need a new canister and, every three years, new electrode wires, which AprilAire says a licensed contractor should replace.

Model	Part to replace	Interval per AprilAire
AprilAire 400	2 Water Panel 45s	Twice per season
AprilAire 500	Water Panel 10	Per the AprilAire owner’s manual
AprilAire 600	Water Panel 35	Once per season
AprilAire 700	Water Panel 35	Per the AprilAire owner’s manual
AprilAire 300	Water Panel 35	Per the AprilAire owner’s manual
AprilAire 800	Model 80 canister (80LC for softer water); electrode wires	Canister once a year; wires every 3 years
AprilAire 865	Model 80 canister; electrode wires	Canister once a year; wires every 3 years

06 AprilAire warranty

Five years on parts, not on labour

AprilAire text

What the owner’s manual says

5 years from installation, for defects in materials or workmanship.
AprilAire supplies the replacement part; the defective part is returned no later than 30 days after the 5-year period.
No labour is covered by AprilAire.
The disposable water panel is excluded.
The warranty is void if the defect results from an installation not done by a qualified heating and air-conditioning contractor.

Source: AprilAire owner’s manual for models 350 to 700M (10008984, February 2016), the most recent full text we found. The 865 (10.22) and 300 spec sheets also state 5 years; for the 800, AprilAire’s 2012 application guide gives 5 years on parts.

What AprilAire does not publish

No up-to-date warranty document on aprilaire.com: the registration page points to the owner’s manual.
No registration deadline stated; the online form accepts Canadian addresses.
No published term for the controls (60, 62, 65, 76) or the steam canister.

07 2026 grants

No grant covers a whole-home humidifier in 2026

Checked on October 20, 2026 on each program’s own site. We say it plainly so that nobody counts on a grant that does not exist.

LogisVert (Hydro-Québec)Guide v1.10 of September 15, 2026: no humidifier among the eligible measures.No grant

RénoclimatMechanical systems: HRV and ERV, drain-water heat recovery. No humidifier.No grant

Chauffez vertProgram ended March 31, 2026.No grant

ÉnergirPE204 list (April 1, 2026): smart thermostats only.No grant

FederalGreener Homes Grant and Loan closed; the affordability program (June 29, 2026) does not mention humidifiers.No grant

ENERGY STAR · AHRINo certification category for whole-home humidifiers.No category

08 AprilAire

AprilAire, whole-home humidifiers since 1954

1938Research Products Corporation, AprilAire’s parent company, is founded in Madison, Wisconsin.

1954First AprilAire whole-home humidifier.

1989First AprilAire automatic humidifier control.

TodayAprilAire is still based in Madison; it also makes dehumidifiers.

AprilAire pages on our site

AprilAire humidifiers and controls also have their own pages, with the site’s filters.

AprilAire humidifiers AprilAire controls All our humidifiers

09 FAQ

Common questions about AprilAire

Which AprilAire goes with a central heat pump?

AprilAire rates its water-panel models with a 120 °F plenum, and its 700 submittal notes that a cooler plenum can reduce evaporative capacity. The 800 steam unit’s output depends on the electrical circuit, not on how warm the air is. Our estimator looks at your system before suggesting a model.

There is no drain near my furnace. What can I do?

The 400 is the drainless AprilAire: it uses all the water it takes in. The other forced-air models (500, 600, 700, 800) need a drain.

My house has no ductwork. Is an AprilAire possible?

Yes: the 865 blows steam into the house through a wall fan pack, and the 300 is a self-contained evaporative unit that needs hot water at 120 to 140 °F.

How many square feet does an AprilAire cover?

According to AprilAire, in a tight home: 3,600 sq ft for the 500, 5,000 for the 400 and 600, 5,300 for the 700, 3,900 for the 300 (2,000 with average construction). AprilAire publishes no area for the 800 and 865.

What is the difference between the 400 and the 600?

Same output (17 gal/day) and a cabinet of the same size. The 600 sends surplus water to the drain and uses one Water Panel 35; the 400 has no drain and uses two Water Panel 45s, replaced twice per season.

Which control comes with each model?

Model 60 with the 400, 500, 600 and 700; Model 62 with the 800; Model 65 with the 865 and the 300. The Model 76 controls AprilAire dehumidifiers.

How often do I replace the panel or the canister?

According to AprilAire: twice per season for the 400’s Water Panel 45s, once per season for the 600’s Panel 35, once a year for the 800 and 865 Model 80 canister, and new electrode wires every three years.

What is the AprilAire warranty?

Five years from installation on parts, no labour, water panel excluded, provided the unit is installed by a qualified heating and air-conditioning contractor (AprilAire owner’s manual, 2016).

Is there a grant for a humidifier in 2026?

No. LogisVert, Rénoclimat and Énergir do not cover whole-home humidifiers, the federal programs do not mention them, and Chauffez vert ended on March 31, 2026 (checked October 20, 2026).

Are AprilAire humidifiers ENERGY STAR?

ENERGY STAR has no category for whole-home humidifiers, and AHRI has no certification program for them.

Is my old AprilAire 800 part of a recall?

AprilAire shows a recall notice on its 800 page for steam humidifiers made from June 2010 to January 2015. Check your serial number with AprilAire.

How much does an installed AprilAire humidifier cost?

The price is on quotation: it depends on the model, the ductwork, the drain, the water and the electrical circuit. Our estimator’s visit is free.

No question matches. Call us at 514 316-2973.

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