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AprilAire 500M Whole-House Humidifier, Manual Compact Furnace Humidifier, Large Capacity Whole-House Humidifier for Homes up to 3,600 Sq. Ft., White

4.6 4.6 out of 5 stars 1,490 ratings

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Humidifier

Purchase options and add-ons

Brand Aprilaire
Special Feature Adjustable Humidity Control, Quiet, Auto Shut Off, Humidistat
Color Gray
Filter Type Evaporative
Floor Area 3600 Square Feet
Capacity
12 Gallons
Material
Plastic
Power Source
ac
Control Method
App

About this item

  • BUY WITH CONFIDENCE This humidifier was designed and manufactured in the USA by AprilAire – the inventor of the whole home evaporative humidifier, and the leader in indoor air quality solutions
  • FULL COVERAGE up to 3,600 square feet in tightly built homes with a capacity of 12 gallons per day
  • MANUAL HUMIDIFIER with a single sensor built into the standard control monitors indoor relative humidity for use in manually setting the percent humidity in your home
  • FEEL MORE COMFORTABLE while also preserving items in your home susceptible to damage from changing humidity or dry conditions
  • HUMIDITY FOR HEALTH AprilAire Humidifiers can help you maintain optimal humidity in your home of 40% – 60% which has been shown to reduce the incidence of respiratory infections and symptoms related to allergies and asthma by minimizing the formation of bacteria and viruses, fungi, and dust mites. In addition, you’ll feel more comfortable while also preserving items in your home susceptible to damage from changing humidity or dry conditions

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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 10.25 x 15.63 x 13 inches; 7.75 Pounds
  • Item model number ‏ : ‎ 500MZ
  • Date First Available ‏ : ‎ February 23, 2010
  • Manufacturer ‏ : ‎ Research Products Corporation
  • ASIN ‏ : ‎ B00R3GEJ6K
  • Country of Origin ‏ : ‎ China
  • Customer Reviews:
    4.6 4.6 out of 5 stars 1,490 ratings

Product Description

Product Description

AprilAire introduced the first evaporative humidifier for forced air furnace systems back in 1954. Since that time, AprilAire continues to lead the industry in whole home humidification systems. Our evaporative humidifiers work by piping water into the distribution tray located at the top of the humidifier. The water is uniformly distributed across the width of the tray and through a scientifically designed system of outlets. It flows by gravity over the Water Panel evaporator. Dry, hot air from the HVAC system is moved through the moisture-laden Water Panel evaporator. Natural evaporation takes place, the water is turned to vapor, and the humidified air is circulated throughout your home.

INCLUDED IN THE BOX: Installation instructions and template, humidifier with built-in bypass damper, 24 VAC transformer, manual humidifier control with sensor, saddle valve, solenoid valve, and Model # 10 Water Panel

From the Manufacturer

Aprilaire introduced the first evaporative humidifier for forced air furnace systems back in 1954. Since that time, Aprilaire continues to lead the industry in whole home humidification systems. Our evaporative humidifiers work by piping water into the distribution tray located at the top of the humidifier. The water is uniformly distributed across the width of the tray and through a scientifically designed system of outlets. It flows by gravity over the water panel evaporator. Dry, hot air from the HVAC system is moved through the moisture-laden water panel evaporator. Natural evaporation takes place, the water is turned to vapor, and the humidified air is circulated throughout your home.


From the manufacturer

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Balance your home's humidity

AprilAire Whole-House Humidifiers balance your home's humidity to help improve sleep and dry skin, enhance productivity, and keep you protected against airborne viruses. Additionally, AprilAire Humidifiers help preserve your home and any contents susceptible to cracking and warping due to low humidity levels.

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Maintain Wellness

Reduce airborne illnesses that can cause respiratory infections, asthma attacks, and allergic reactions by maintaining proper relative humidity in your home.*


*E.M. Sterling, “Criteria for Human Exposure to Humidity in Occupied Building,” ASHRAE Winter Meeting, 1985


Lower Energy Costs

Humidifiers can affect the "real feel" temperature in your home, which can prevent your furnace from working overtime.

Home Preservation

Air that’s too dry can cause wood to splinter. Protect the structural integrity of your home and wooden furnishings like floors and cabinets with solutions intuitively designed to create healthy environments.

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Compatible AprilAire Water Panel Humidifier Filter

Humidity for Comfort

Whether your home is in a dry region of the country, or in an area with seasonal dryness, maintaining proper humidity levels can make all the difference in how comfortable you feel in your home.

Humidity Control at the Ready

All our humidifiers ship with either an Automatic or Manual Humidifier Control (also known as a Humidistat). With an AprilAire Whole-Home Humidifier, you will also avoid common problems associated with less moisture in the air such as dry throat and static shock.

AprilAire Genuine Water Panels

Designed to keep your AprilAire humidifier operating at peak performance, AprilAire Water Panels should be changed per the recommended schedule for your Model, typically once or twice per heating season. All AprilAire Whole-Home Humidifiers ship with the Water Panel(s) needed for one season. Additional/Replacement Water Panels sold separately.

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AprilAire 500M Whole-House Humidifier + Manual Control AprilAire 300 Self-Contained Whole-House Evaporative Humidifier AprilAire 400M Whole-House Humidifier + Manual Control AprilAire 600M Whole-House Humidifier + Manual Control AprilAire 700M Whole-House Humidifier + Manual Control AprilAire 800 Whole-House Steam Humidifier
Customer Reviews
4.6 out of 5 stars
1,490
3.7 out of 5 stars
5
4.4 out of 5 stars
212
4.6 out of 5 stars
878
4.5 out of 5 stars
779
Water Capacity (Gallons Per Day) 12 GPD 13 GPD 17 GPD 17 GPD 18 GPD 11.5 GPD
Home Size Coverage 3600 Sq. Ft. 3900 Sq. Ft. 5000 Sq. Ft. 5000 Sq. Ft. 5300 Sq. Ft. 10,300 Sq. Ft.
Water Panel Model & Replacement Frequency Per Season 10, Once 35, Once 45, Twice 35, Once 35, Once 80 Steam Canister, Once
Fan Included Yes
Floor Drain Required Yes Yes Yes Yes Yes
Dimensions & Weight 15.63" L x 10.25" W x 13.0" H, 7.75 lbs. 14.38" L x 22.07" W x 12.43" H, 29.2 lbs. 15.38" L x 10.25" W x 15.75" H, 10.0 lbs. 15.38" L x 10.25" W x 15.75" H, 10.0 lbs. 15.91" L x 11.35" W x 18.0" H, 17.0 lbs. 10.13" L x 7.13" W x 20.88" H, 23.0 lbs.
Electrical Specifications 24VAC, 1 phase, 60 Hz, 0.5 Amps 120VAC, 1 phase, 60 Hz, 0.7 Amps 24VAC, 1 phase, 60 Hz, 0.5 Amps 24VAC, 1 phase, 60 Hz, 0.5 Amps 120VAC, 1 phase, 60 Hz, 0.8 Amps 120VAC, 1 phase, 60 Hz, 11.5 Amps

What's in the box

  • 24VAC Transformer, Humidifier Control, Valves, Installation Instructions
  • Product guides and documents

    Looking for specific info?

    Customer reviews

    4.6 out of 5 stars
    4.6 out of 5
    1,490 global ratings

    Customers say

    Customers like the performance, value, fit and quality of the humidifier. For example, they mention it works well, is efficient and a good value for the cost. Some are satisfied with ease of installation, and comfort. That said, some complain about missing pieces and humidity.

    AI-generated from the text of customer reviews

    172 customers mention160 positive12 negative

    Customers are satisfied with the performance of the whole house humidifier. They mention that it works fantastic, it operates very efficiently, and it works great with their ecobee 4. Customers also say that it's a great product and that it instantly raises the humidity of their whole house.

    "...Works better than I expected, at a very good price. Easy to use and maintain. May want to hire a pro to install, but is possible to put in yourself." Read more

    "...is nice because it’s not as big and bulky and seems like it’s doing amazing job." Read more

    "...All things considered though, it is an excellent product,works well and designed to give many years of service." Read more

    "...It works great." Read more

    142 customers mention123 positive19 negative

    Customers find the installation process of the humidity sensor to be easy. They mention that it can be installed by a homeowner with elementary electrical knowledge. Some say that the wiring is simple.

    "...Works better than I expected, at a very good price. Easy to use and maintain. May want to hire a pro to install, but is possible to put in yourself." Read more

    "...designed to handle most installation configurations, coming with easy to install instructions and when ordering the installation kit includes..." Read more

    "...ie the 500M. Installation to the warm/cold air supplies is pretty much straight forward...." Read more

    "Was pretty easy to install. If you have a Nest Smart thermostat, it is very easy to wire but you will need a extra wire to wire the humidifier...." Read more

    54 customers mention47 positive7 negative

    Customers like the value of the tools. For example, they mention it's a good deal, works great, and is livable. Some mention that the electric bill has already gone down.

    "...Works better than I expected, at a very good price. Easy to use and maintain. May want to hire a pro to install, but is possible to put in yourself." Read more

    "...Easier to control and hook up then the digital stat. The package was a great deal with the bypass hookup kit included." Read more

    "...All-in-all, this was pretty easy and was much more economical than buying a single room unit that you need to refill constantly...." Read more

    "...My electric bill has already gone down, my house actually feels warm when it's 10 degrees outside, we are static-free and I don't itch from dry skin..." Read more

    31 customers mention25 positive6 negative

    Customers like the quality of the humidifier. They say it's well-made, reliable, and easy to operate and maintain. Some mention that it extends the durability of their house.

    "...Working great, good product. Satisfied with product." Read more

    "...I think the unit is a quality product and it works properly, but we just haven't noticed a really big difference in comfort...." Read more

    "...before, this new one is so far I expected: Affordable, efficient, reliable and easy operate and maintain...." Read more

    "...Good product. Reasonable price. Speedy delivery. Overall good vendor experience." Read more

    20 customers mention20 positive0 negative

    Customers like the comfort of the air purifier. They say it helps them breathe comfortably in the dry winter, and their skin feels better. They also say it extends the durability of their house and improves air quality.

    "...1. Does exactly what it should. keeps your home at a comfortable and healthy RH% that you set, and does it in a relatively quick amount of time...." Read more

    "...Our skin feels better, our sheets don’t feel like ice when we get in bed...." Read more

    "...I have it set to 40% and my house feels so much more comfortable during those frigid winter months when the furnace is running often...." Read more

    "This product was easy to install and works great. House is more comfortable now!" Read more

    14 customers mention11 positive3 negative

    Customers like the fit of the tool. They mention it's very compact, works perfectly, and is space saving. Some say that the unit is not large enough to put enough moisture on the carpet.

    "...This one is nice because it’s not as big and bulky and seems like it’s doing amazing job." Read more

    "...Very compact which was great since I was limited on space. Brought our house up from 16% to 28% humidity in two days after running...." Read more

    "Nice small unit, but does not seem large enough to put enough moisture into the supply duct for my house on dry days...." Read more

    "The wire that comes from the kit is too short. Add $12 from Lowes The wire schematic has no color markings...." Read more

    12 customers mention0 positive12 negative

    Customers are dissatisfied with the humidity of the product. They say that it doesn't distribute the humidity as well as the 700a, and that the instructions on the humidistat were unclear. They also mention that the water is drained out of the humidifier, and no longer dries out in the house. Customers also mention the humidity is not 100% useful if the humidistat is not working.

    "...The instructions on the humidistat were a bit unclear and would be troublesome for the average DIYer...." Read more

    "...One day, I noticed a wet spot on my ceiling and found a leak caused by the issues I described above...." Read more

    "...The unit simply does not leave much humidity as most of the water drains through and right out...." Read more

    "water leaking by drain spud" Read more

    12 customers mention0 positive12 negative

    Customers are dissatisfied with the missing pieces in the installation kit. They mention that it doesn't come with all the hardware and information needed for installation. Some customers also mention that the cover was missing a Drain spud and a plug.

    "Would have given 5 stars but the cover was missing a Drain spud and a plug...." Read more

    "...would recommend just getting the stuff yourself because the kit doesn't have the ducting that I needed for the install." Read more

    "this unit doesn’t come with everything you need to install it...." Read more

    "...This unit does not include any ducting, feed line, drain line or enabling relay which other (more expensive) vendor's units provide...." Read more

    Close to a direct replacement for an old airflow.
    4 Stars
    Close to a direct replacement for an old airflow.
    Replaced an old Air Flo humidifier I couldn’t find parts for anymore. Had to cut a larger opening using tin snips (hardest part) I also replaced lower 90 elbow of the old set up because it was scaled up. I used existing wiring and water connection. I used the existing transformer and just replaced the thermostat. I did need to add a drain line which my old one did not require. Note: Make sure you snap in the filter. I didn’t and the force of the airflow blew it out and I had water all over the floor. I like accessibility to parts. I’ve since purchased most things likely to fail or scale up.
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    Top reviews from the United States

    Reviewed in the United States on November 11, 2023
    Style: HumidifierVerified Purchase
    Customer image
    5.0 out of 5 stars This thing works!
    Reviewed in the United States on November 11, 2023
    I installed a 500M on my furnace due to my house being very dry during harsh midwestern winters. It works perfectly keeping my home at a comfortable humidity 24/7.

    Pro's:
    1. Does exactly what it should. keeps your home at a comfortable and healthy RH% that you set, and does it in a relatively quick amount of time.

    2. Easy to use and replace the filter. Adjusting the the settings are as easy as turning a knob to the desired humidity, and it even guides you to suggested levels in relation to the outside temperature. Replacing the filter is quick and easy. Just open the cover, disconnect the water line, removed old and install new.

    3. Cost. This unit does a lot for a little investment.

    Con's:
    1. I personally didn't have any issues installing this unit in my house, but it is not something that everyone would want to take on without any HVAC experience. Understand that you will need to cut into your furnace ducting in multiple locations, and have the proper tools to do so, like tin snips, gloves, pliers, etc. You'll also have to do some basic wiring to hook up the humidistat to the furnace and the humidifier, and you'll likely need to be able to read and understand your furnace wiring diagram to know where to wire the unit properly to only work when the furnace is in it's heating mode. This would require some of the proper wire, an enclosed junction box of some kind (not required, but recommended), wire strippers, and hand tools. lastly, you'll need to get the excess water from the unit to an acceptable drain. I tied mine into my condensation trap with some 1/2" PVC and mounting straps. The unit does come with it's own drain hose, but I preferred to drain mine in a rigid line. You'll also have to supply the unit with water. This means tapping into an existing water line, or running a new one.

    If you think you can do all the above to install it yourself, it can be done with the proper tools and knowledge. If any one of those tasks seems like it might be out of your league (looking at you, electrical lol), then I would recommend hiring a professional to put it in.

    Overall:
    Works better than I expected, at a very good price. Easy to use and maintain. May want to hire a pro to install, but is possible to put in yourself.
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    17 people found this helpful
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    Reviewed in the United States on January 28, 2024
    Style: Humidifier + Installation KitVerified Purchase
    One person found this helpful
    Report
    Reviewed in the United States on January 29, 2019
    Style: HumidifierVerified Purchase
    Customer image
    5.0 out of 5 stars Wonderful Machine. See Photos for tips on simple installation (DIY)
    Reviewed in the United States on January 29, 2019
    Very pleased with this Whole-Home Humidifier I installed myself without any prior professional experience. That being said, I did spend about 5 hours researching installation techniques as the included directions are both difficult to make sense of as a layperson and also fail to reflect newer construction homes with furnace boards containing dedicated humidifier (labeled HUM) circuits. If you have a newer home, see photos and follow instruction. If your furnace's HUM circuit is 24VAC, then you won't need to use EITHER the included transformer or the recommended relay (an additional $35). When you wire the humidifier (using 18/2 thermostat wire), the humidifier only runs when the furnace fan/blower unit is running. When the home thermostat triggers the furnace to run a cycle, it will automatically trigger the humidifier to run along with the furnace. This is ESSENTIAL in saving TONS of money on unnecessary water usage. If you bought the MANUAL version humidifier (like me), then without paying additionally for the relay accessory the humidifier will run around the clock even when the furnace motor is off, essentially just draining your hot water down your floor drain.

    WIRING (with newer home construction or recently upgraded furnace)
    You'll first install get the entire unit installed after cutting LEVELED spaces into HVAC using included templates. It is essential that the unit is installed perfectly leveled to ensure balanced water flow throughout the humidifier unit filter.
    (1) Then, you'll run an 18/2 Thermostat Wire from the furnace circuit board into the vent where your humidifier unit is hooked up (you'll 18/2 wire will come in either a brown or gray sheath containing two wires; one white, and one red). Use conduit to protect wire if running between two vents, as shown in the attached photos.

    (2) With the 18/2 from the furnace circuit board to the humidifier, you'll tie-in the WHITE wire directly to one of the 2 yellow wires attached to the humidifier unit. The other end of the white wire will hook up to your HUM circuit on the furnace board using a CLAM adapter specified to your 18ga wire.

    (3) The red wire from the 18/2 running from the furnace circuit board to the humidifier unit will then tie-in to the screw on the near-side of the included thermostat (hung a minimum of 6" above your humidifier unit. The other end of the red wire will tie-in to your COMMON circuit on your furnace circuit board, labeled with a C. This is your 24VAC. There will likely be 1-2 cables already tied into your (C)Common from your homes thermostat and/or AC, so if you need to butterfly the wires to avoid crowding up the input then do so. (See included picture)

    (4) You'll then run a new, single red wire (pulled out of the brown/gray sheath) from the other screw point on the thermostat directly to the 2nd yellow wire on the thermostat unit. Simple as that! Hooking it up this way will ensure that your humidifier only pulls hot water when the furnace cycle is actively running after being triggered by your homes thermostat as it calls for more heat.

    TIPS from the PRO FORUMS I researched:

    -Avoid using the semi-rigid, extendable and flexible duct pipe when connecting the vent from your humidifier unit to the opposite return/flow vent (see pictures). PROS stated they never use this pipe for humidifiers because moisture can build up in the many grooves which can pose many problems down the road. RIGID Vents also allow for smoother airflow.

    -It was advised to NEVER use the included adapter for cutting into your copper piping to pull water if you are installing in a home without newer PEX Pipe. They stated these always fail over time and will begin to leak. If you have copper piping, you may need to solder in a T-Joint to run the 1/4" hot water line (this skillset is likely beyond the DIY'er). Bite the bullet and hire a pro, even if it is just for this purpose.

    -Use COPPER 1/4", and NOT plastic tubing when running from your hot water line (it is further advised to always run hot water through the humidifier) to your humidifier unit.

    -If you have PEX Pipe, working with Shark Bite joints is a breeze--just make sure you measure the depth of how far the pex pipe needs to be inserted into the Shark Bite valve to ensure proper seal.

    All in all, this was a lengthy install (took me about 6.5 hours with zero prior experience with HVAC) but the unit is running exactly as I had hoped. After one evening's cycle, humidity in the home is up 4% and I hope to be at the recommended 35% within 3-5 days (it was also recommended to NEVER put your humidifier thermostat above 35%, as this can result in excessive moisture build up in the home and lead to mold issues as well as harm any wood work/cabinets). I paid an additional $100 for materials, and saved myself the $300 installation charge for a pro (this was the low-end of estimates I received). The other perk of the self-install is forcing yourself to learn/understand the unit's functioning, which will assist with ongoing maintenance and troubleshooting if problems arise. Give it a go!
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    123 people found this helpful
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    Reviewed in the United States on November 16, 2023
    Style: Humidifier + Installation KitVerified Purchase
    4 people found this helpful
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    Top reviews from other countries

    Amazon Customer
    5.0 out of 5 stars Furnace Flow thru Humidifier
    Reviewed in Canada on February 14, 2024
    Style: HumidifierVerified Purchase
    Customer image
    Amazon Customer
    5.0 out of 5 stars Furnace Flow thru Humidifier
    Reviewed in Canada on February 14, 2024
    Excellent product & great value for the money, This Apriliare Humidifier took me 4 hours to install (including removal of the old unit) any one who has basic mechanical/ electrical skills can do this. I reused the "saddle valve" (as it has been in use for 15 years with No leaks/problems) had to cover the old "cut out" with sheet metal/sealed with metal tape. My previous home I installed Apriliare Humidifier "flow thru" & never had any issues, missed it so replaced the old drum type Honeywell (motor failure). These will last & easy to maintain, would highly recommend Apriliare products. I do have Plumbing experience, with mechanical knowledge, so install was easy saved $$$. Shopped around & Amazon delivered it in 2 days Free Shipping. note: couldn't find any in Airdrie, as the hardware stores here don't carry any. Overall very pleased with the service & product.
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    Joe Smith
    5.0 out of 5 stars Easy to install compared to Honeywell
    Reviewed in Canada on January 7, 2024
    Style: HumidifierVerified Purchase
    Sawdustbypat
    5.0 out of 5 stars 500M Aprilaire Humidifier
    Reviewed in Canada on December 11, 2023
    Style: HumidifierVerified Purchase
    Manish
    4.0 out of 5 stars Lots of water waste if. You don't set it right.
    Reviewed in Canada on February 27, 2023
    Style: HumidifierVerified Purchase
    2 people found this helpful
    Report
    DAVID A.
    5.0 out of 5 stars Good unit
    Reviewed in Canada on November 27, 2023
    Style: HumidifierVerified Purchase