Humidifier for Furnace

In unfortunate cases, low moisture levels don’t occur in a single room but rather throughout the entire house. Sure, in some areas it’s worse than it is in other areas, yet the idea is that you cannot rely on separate humidity raising devices for each room as this would be costly not only upfront, but when it comes to maintenance work as well, and it would be highly ineffective. What you should do if you are in this situation yourself is to wire a furnace humidifier straight into the HVAC system of your house, tap into the plumbing, and ensure a comfortable and healthy indoor environment throughout the entirety of your home.


Top 7 Humidifiers for Furnace Comparison

ImageProductsPrice
Emerson HSP2000 Image

Best Choice
1. Emerson HSP2000
  • Area coverage: 1400 square feet
  • Rated output: 13 gallons per day
  • Bypass damper: No
  • Dimensions: 7.6” x 12.5” x 12.6”
  • Weight: 18.1 lbs
  • Warranty: 2 years
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Aprilaire 500M Image

Our Choice
2. Aprilaire 500M
  • Area coverage: 3000 square feet
  • Rated output: 12 gallons per day
  • Bypass damper: Yes
  • Dimensions: 15.6” x 13” x 10.3”
  • Weight: 7.5 lbs
  • Warranty: 5 years
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GeneralAire 1000A Image
3. GeneralAire 1000A
  • Area coverage: 3000 square feet
  • Rated output: 18 gallons per day
  • Bypass damper: Yes
  • Dimensions: 16” x 16.5” x 10.5”
  • Weight: 15 lbs
  • Warranty: 10 years
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GeneralAire 1042-LH Image
4. GeneralAire 1042-LH
  • Area coverage: 2800 square feet
  • Rated output: 17 gallons per day
  • Bypass damper: Yes
  • Dimensions: 11.5” x 15” x 9”
  • Weight: 13 lbs
  • Warranty: 5 years
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Honeywell HE360A Image
5. Honeywell HE360A
  • Area coverage: 4200 square feet
  • Rated output: 18 gallons per day
  • Bypass damper: Yes
  • Dimensions: 15.3” x 14” x 10.3”
  • Weight: 14.8 lbs
  • Warranty: 1 year
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Honeywell HE300A10005 TrueEASE Image
6. Honeywell HE300A10005 TrueEASE
  • Area coverage: 3000 square feet
  • Rated output: 18 gallons per day
  • Dimensions: 15.5” x 16.8” x 10.3”
  • Weight: 16.2 lbs
  • Warranty: 3 years
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Honeywell HE100A1000 Image
7. Honeywell HE100A1000
  • Area coverage: 2300 square feet
  • Rated output: 12 gallons per day
  • Bypass damper: Yes
  • Dimensions: 14.5” x 14” x 10.1”
  • Weight: 11.6 lbs
  • Warranty: 5 years
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Furnace Humidifiers Reviews

Emerson HSP2000

Perpetually monitoring indoor humidity levels to ensure a proper upkeep of moisture so that you may live in a healthy environment, the HSP2000 is the most desirable option to go for as it not only performs remarkably well, but it is built to last. It is recommended for use in spaces of at least 1400 square feet, so you can confidently use it if you have a medium or large-sized home. It measures 7.6 inches by 12.5 inches by 12.6 inches, and it weighs only 18.1 pounds, so maneuvering it during the installation process won’t be all that complicated. However, since we are on this note, it is recommended that you call in a professional instead of doing the installation procedure yourself if you haven’t done one before or you aren’t sure you can handle it as you might void the 2-year warranty provided for it by damaging the product during installation.

Humidifier for Furnace Picture

Performance

This steam-powered system outputs approximately 13 gallons of moisture per day, ensuring a rapid raising of humidity levels indoors regardless of how severe your specific issues are. It features a humidistat that ensures a perpetual monitoring of air humidity levels, automatically outputting moisture when the levels drop below your preferred level so that a healthy habitat is ensured. To set the desired moisture level to be maintained by it, all you have to do is to rotate the knob it features until you reach that specific quota.

Flushing Timer

The role of the flushing timer is to automatically flush the mineral deposits that accumulate in the humidifier. From the factory, the timer is set to perform the flushing procedure for 10 seconds once every 2 hours. There is the possibility for you to reprogram it and set a different duration for the process, as well as select a different time gap between flushing sessions. By doing so, you can customize the function according to your specific needs, as in some cases mineral deposits accumulate faster, while in other cases they accumulate less often.

Mention Worthy Details
  • For safety in use and product durability, it features a safety cutoff switch and an overflow protection.
  • Comes with the typical mounting components needed for the installation process.
  • As it features the thermal fan interlock control, it works to humidify the air without necessarily requiring furnace heat.
Air Filter

The air filter that it incorporates is another mention worthy feature as it enhances operational effectiveness. What it does is remove toxins like allergens and pollutants that linger in the air, thus further enhancing air quality as in addition to normalizing moisture levels, it purifies the air you breathe as well.

What We Like

  • As it uses steam power to generate moisture, it enhances humidity levels rapidly
  • Comes with safety features that aid prolong the device’s lifespan
  • Outputs up to 13 gallons of moisture per day

What We Dislike

  • Asking price is higher than industry standard

VERDICT
Although it is on the expensive side, due to the fact that it comes with safety features that enhance its lifespan and it provides moisture generating capabilities like no other products in its niche, this is certainly an acquisition worth making.

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Aprilaire 500M

This manual control system ensures comfort during the dry months of winter as it is designed to output up to 12 gallons of water per day. Designed for use in spaces of up to 3000 square feet, you can confidently rely on it to ensure a safe habitat to live in. it is a bypass model that you mount on the duct of the cooling or heating system of your home, distributing moisture throughout the entire space in an effective manner. The installation process is further eased by the design of the product as it weighs only 7.5 pounds, and measures a mere 15.6 inches by 13 inches by 10.3 inches. It features a drain that you can use to flush out mineral deposits that gather inside it, a feature that ensures a prolonged lifespan. It requires a plenum opening of 9.5 inches in width by 9.5 inches in height for the installation process, and it operates on 24V at 60Hz. Furthermore, the manufacturing company backs it with a quite lengthy 5-year warranty against defects, so you will be covered when it comes to reparation costs while this agreement is active.
What We Like

  • Recommended for use in spaces of up to 3000 square feet
  • Provides a hefty moisture output of 12 gallons per day
  • Backed with a lengthy 5-year warranty

What We Dislike

  • Not the quietest system you will stumble upon

VERDICT
As it covers quite a generous area and it is capable of rapidly raising indoor moisture levels to ensure a healthy habitat for you and your loved ones, the Aprilaire is a dependable choice to go for. Additionally, it comes at a reasonable price that makes it a more accessible option.

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GeneralAire 1000A

The 1000A is specially designed for residential and light commercial applications. As it can cover an area of up to 3000 square feet, you can rely on it for a medium or large-sized space. In terms of efficiency, there’s nothing to worry about due to the fact that it outputs up to 18 gallons of moisture per day, thus ensuring a quick fixing of your problems. The plenum opening it requires is of 14 inches in width by 12 inches in height, and you can mount it on the supply or return duct system. The humidistat that it comes with allows you to set the appropriate moisture level you want to be achieved indoors. It is a fan powered flow-through system that measures 16.5 inches in height, 16 inches in width, and 10 inches in depth, which recommends it for situations where free space is an issue. Maintenance is required only once per year with it, and seeing how the manufacturing company backs it with a 10-year warranty, a lot of time will pass before you will invest a cent in it.
What We Like

  • Capable of outputting up to 18 gallons of moisture per day
  • Delivers its best performance when used in spaces of up to 3000 square feet
  • Accompanied by a lengthy 10-year warranty

What We Dislike

  • Installation process should be handled by a professional

VERDICT
As it requires little in the way of maintenance work, comes at a fair price, and is backed by a long warranty, this system makes for a smart acquisition. Add to the aforementioned details the fact that it outputs an impressive 18 gallons of moisture per day, and you get one of the most effective products in this niche.

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GeneralAire 1042-LH

This flow-through model has a minor downside to it, more precisely the fact that it lacks an air filter that would have enhanced its capabilities in terms of air quality improvement. However, seeing how this is its only flaw and that it provides a great humidity raising performance as a whole, it is worth taking into consideration, especially for those who are on a budget. It is made with UV-resistant automotive grade plastic that ensures a long-lasting durability. It can be installed on the right or left side of the return air plenum and it requires a bypass opening of 6 inches and a plenum opening of 10.25 inches in width and 13-5/8 inches in height. It features an evaporation pad that only requires to be changed 1-2 times per year. It provides an impressive moisture output of up to 17 gallons per day, which proved how effective it is. When it comes to area coverage, you can rely on it to raise moisture in spaces of up to 2800 square feet. Lastly, the manufacturing company backs it against defects during the first 5 years after you purchase it.
What We Like

  • Made with UV resistant automotive grade plastic
  • Can be installed on either side of the return air plenum
  • Backed by a 5-year warranty against defects

What We Dislike

  • Does not come with a filter

VERDICT
Even though it lacks the filter that other systems come with, this is a flaw worth overlooking considering the cheap price it comes at. Furthermore, it outputs a sufficient amount of moisture per day in order to ensure a rapid normalization of humidity levels indoors.

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Honeywell HE360A

As it boasts a flow-thru design, this system will keep the air in your home clean by ensuring an upkeep of moisture levels in the most convenient manner possible, not requiring much in the way of maintenance work. Due to the PerfectFLO distribution tray that it comes with, it ensures a proper optimization of water usage and performance efficiency. It comes with a humidistat that enables you to pick the exact moisture level you want to maintain indoors. The maximum area that it can cover is 4200 square feet, which makes it ideal for light commercial purposes and use in medium to large-size residences. Another aspect that enhances its desirability is the fact that it can output up to 18 gallons of moisture per day. Unfortunately, even though it is advertised as being easy to install, there were a few customers who complained they had issues with this procedure and that it took a lot of time. Thus, it is in your best interest to ask for a professional installation if you haven’t done this type of procedure beforehand. Additionally, the company that produces it warrants it against defects for 1 year.
What We Like

  • Low maintenance system that utilizes fan-powered flow-thru to provide immediate humidification
  • Recommended for use in spaces of up to 4200 square feet
  • One of the cheapest options you could go for

What We Dislike

  • Some customers had difficulties with the installation process

VERDICT
To sum up just how great this product is, seeing how its only realistic downside is that it might take a hefty amount of time and effort to install it, and that it provides one of the most effective moisture increasing performances at the moment, it’s safe to say that you won’t regret buying it.

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Honeywell HE300A10005 TrueEASE

A discrete whole-house humidification solution that you will adore using as it provides a great coverage of up to 3000 square feet and maintains utter quietness in its operation, it is one of the most sought-after products in its niche for all the right reasons. It directly mounts onto the heating and cooling system duct, the installation process being quite easy. As it weighs only 16.2 pounds, you won’t have trouble maneuvering it when you set it up either. Its automatic humidistat control ensures comfortable humidity levels throughout the house, all while helping conserve energy and water as well. Over a 24-hour time span, it can release up to 18 gallons of moisture into the air to elevate humidity levels. A 3-year warranty is offered by the manufacturing company. Overall, it is a product in which we put our trust and hope you do the same as it is indeed worth the investment.
What We Like

  • Features automatic humidistat control
  • Quiet operation
  • Easy to install

What We Dislike

  • Not as feature-rich as other entries

VERDICT
Even though it is clearly surpassed by other entries in its niche, this Honeywell product is still investment worthy as it can increase humidity throughout the house with ease due to its 3000 square feet coverage.

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Honeywell HE100A1000

Suitable for homes up to 2300 square feet in size, the Honeywell is a reliable selection to opt for as it can enhance indoor humidity by up to 12 gallons per day. Thus, in a matter of days, you won’t feel the air indoors dry anymore. It can operate in temperatures ranging from 34 to 90 degrees Fahrenheit. You are sure to have an easy time installing it as it comes with a duct mounting place that you can use as guidance, as well as a manual where clear instructions are provided. It provides user-friendly pad access in order to easy your work when you perform upkeep or maintenance tasks. The HumidPRO digital humidity control it features enables a convenient adjusting of its output settings. As it features operational noise reduction, it won’t make bothersome sounds when it runs. When it is not in use, it automatically closes the bypass, thus helping save up to 50% of water to reduce operational costs as a whole. Furthermore, it is backed by a hearty 5-year warranty on parts and labor.
What We Like

  • Features a user-friendly pad access that allows easy upkeep and maintenance
  • Quick and easy installation process saves you time and money
  • Operating temperature range – 34 to 90 degrees Fahrenheit

What We Dislike

  • Smaller area coverage than our other entries

VERDICT
Even though it might not provide as generous of an area coverage as our other entries do, this Honeywell product still makes for a smart acquisition as it provides a hearty moisture increase of up to 12 gallons per day, and comes at a much more reasonable price than most of its competitors.

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Rating Process Explained

Rating CriteriaExplanationProduct to Receive the Best Score
Maximum covered square footageThis specification shows what is the amount of space that the moisture enhancing system can handle covering while maintaining an optimal performance. This is the first element to look into when you make a purchase as you could end up with a product that cannot handle the area size you need to cover, over or under performing considerably.Honeywell HE360A
Amount of daily moisture outputThe efficiency of the system is best described by the amount of moisture it can release into the air throughout the duration of an entire day. Models that delivers higher output capacities are more desirable when it comes to this aspect as they provide a rapid fix to your specific low indoor moisture level issues.GeneralAire 1000A, Honeywell HE360A
Easy installationIf the installation process for the system is complicated, you are obliged to call in a professional for this procedure. Otherwise, you risk damaging it and voiding the warranty agreement that it is accompanied by. Seeing how this would be a costly service, it is preferable to opt for a system that is easier to install.Aprilaire 500M
Safety featuresSafety features are set in place not only to ensure a proper functioning of the system that will ensure your health and integrity are not put in any danger, but to guarantee the fact that the investment you are making is a long-lasting one as well. The more safety features to accompany a system the better as it indicates you are making a quality purchase.Emerson HSP2000
Warranty agreement lengthThe warranty agreement stipulates the terms and conditions under which the system will be repaired or replaced by the manufacturing company without charging you for the procedure. It is important for the length of this agreement to be as big as possible so that you will be covered from any extra costs related to the product for a long time.GeneralAire 1000A

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Troubleshooting Tips

Problem
Solution
It doesn’t get waterCause #1 – The water inlet valve is defective or clogged. If it is clogged, you obviously have to unclog it. In case this doesn’t seem to be the issue at hand, use a multimeter to test the valve’s continuity. If it does not have continuity, it means that it is defective and requires replacement.Cause #2 – The saddle valve is clogged. Over time, calcium deposits and sediment cause it to clog, and we recommend that you replace it rather than clean it as this is one of the least expensive parts in a humidifier. Considering that the unclogging procedure for it can get quite difficult, the effort wouldn’t pay off.
Fan stopped workingIf the fan blade does not spin freely, you have to replace the blower motor. In case it does spin, test the continuity of the blower motor using a multimeter. In case it does not have continuity, the part requires replacement. If it does have continuity, check to see if it is provided with power or not.
OverflowingCause #1 – Water valve is stuck open. To check if this is the issue at hand, disconnect the power to the device, turn off the humidistat, and check if water still flows through the valve. If it does, it means that it is defective and requires replacement.Cause #2 – Improper shut-off of the float valve. To check if this is the problem, lift the float as this action is supposed to prevent the water from entering the reservoir. In case the water continues to flow, it means that the float valve needs to be replaced.
It doesn’t drainCause #1 – The evaporator pad is clogged. Check if the water slides over the pad and drips outside the collection tray. If this happens, it means that the evaporator pad has indeed clogged with calcium and other mineral deposits, and it requires replacement.Cause #2 – Water line is out of position or broken. Check the line from the inlet valve to the pad, and the one from the bottom of the device. In case it is clogged, clean it out. if leaking still occurs, it means that the water line in cause must be replaced.

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Customer Feedback

A humidifier that can handle covering wide areas is always an expensive purchase, furnace models being all the more pretentious from this point of view and more, replacement parts for them generally costing more than they do with other types of moisture increasing devices. Thus, the need to make sure the product you are investing in is qualitative is imperious, and to aid you in your quest, we gathered a few positive and negative opinions about each entry in our top from customers who have already acquired them.

Emerson HSP2000
Positive reviews:Negative reviews:
”Installation was pretty straightforward, didn’t have issues with it.”

”Low maintenance, didn’t give me headaches from this point of view.”

”Quiet, efficient, self-cleaning – best humidifier I ever had.”

”Love the wonderful warm moist air it produces.”

”Flush control works well, I never have to worry about mold.”
”Needs to run a lot to keep humidity levels in check.”
Aprilaire 500M
Positive reviews:Negative reviews:
”Simple design and easy to install if you are remotely handy.”

”Manual control knob is very accurate.”

”Brought the humidity to where I need it fast.”

”Works great, better than any portable unit I had before.”

”No more dry lips and skin since I installed it.”
”The water pad doesn’t stay in place precisely.”

”Started dripping soon after I bought it.”
GeneralAire 1000A
Positive reviews:Negative reviews:
”I heartily recommend it, especially when hot water is used as it gives better evaporation.”

”Keeps the interior comfortable during dry winter days.”

”Humidity increased rapidly after I installed it.”

”I like the humidistat, it’s large and easy to read off.”

”The fan is hardly noticeable.”
”I found the installation process to be a bit more difficult than expected.”

”The solenoid outlet collar wasn’t tightened, it started leaking after a while.”
GeneralAire 1042-LH
Positive reviews:Negative reviews:
”Works as advertised, raises humidity indoors in no time.”

”Super easy to install, didn’t expect it to go so well.”

”Did wonders for our 1800 square foot home.”

”Everything needed for the installation is included, and it comes at a great price.”

”Customer service responded quickly to my requests.”
”Started leaking all over the floor after a few months.”
Honeywell HE360A
Positive reviews:Negative reviews:
”Works great, no issues installing or running it up to now.”

”Post installation it raised humidity to about 60%.”

”Adequate performance, never had issues with my allergies since I bought it.”

”Easy, simple maintenance, it takes only 5 minutes to change the pad.”

”I love how low maintenance it is, I only clean it once per year.”
”Water shut-off failed after a couple of years.”

”Replacement parts are ridiculously expensive.”
Honeywell HE100A1000
Positive reviews:Negative reviews:
”Easy job when it comes to maintenance, the pad access is a real life saver.”

”Love the lengthy warranty and how nice customer support is.”

”Was easy to install, directions in the manual were very straightforward.”

”Big difference in utility bills since we use it.”

”It comes with everything needed to mount and run it.”
”Direct valves are sensitive to hard water.”

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Choosing a furnace humidifier is a smart move not only budget-wise but when it comes to your health and comfort while indoors, and we congratulate you on taking this decision. However, making a pick can seem rather tricky as the variety of models out there likely have you confused on what your best option is. As you can see, we selected what we consider the top quality selections on this market and reviewed each of them to make your search easier. For those who have the needed budget and want to enjoy utter quality, the Emerson HSP2000 is definitely the go-to option as it outputs a staggering 13 gallons of moisture into the air per day, solving low humidity issues in a matter of days and preserving optimum levels from there on to ensure you dry air will never affect you again. For those in need of a humidifier that can cover wider areas, the Honeywell HE360A is the smarter pick as it is designed to cover areas of up to 4200 square feet without flinching. Furthermore, it outputs approximately 18 gallons of moisture per day, so it is bound to fix low moisture issues in no time. However, there is the matter of budget to cover as well, and for those looking for a cheap yet effective product, the GeneralAire 1042-LH is the recommended option as it not only comes at a more reasonable price, but it actually provides quite an impressive moisture output of up to 17 gallons per day.

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