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9 Best Rated Humidifiers for Furnace

46

Models Considered

67

Hours of Research

5

Experts Interviewed

318

Consumer Reviews Analyzed

M ost people who live in dry climate areas experience symptoms caused by low humidity, either in a milder or a more aggravated degree. The most common are itchy skin and dry throat, but breathing problems may develop over time if the issue isn’t solved. In this case, the best solution to maintain an optimal humidity level for the entire family is to install a humidifier.

As pointed out by the ASHRAE handbook of HVAC systems and equipment, there are several types of humidifiers for commercial and personal use. Picking the right product mostly depends on the types of issues you are dealing with. Furnace-mounted models like the humidifiers we will review in the following work best for people who are in need of moisture increase not only for a single room or area of their home but rather for the whole construction. Some of the advantages of opting for a furnace-mounted system include:

  • You won’t have to worry that air moisture might be within unhealthy parameters in any area of your home anymore.
  • Save money since you won’t need separate humidity increase units for different areas of the house.
  • Save on the heating bills since high humidity makes it feel warmer inside.
  • Protect hardwood floors and wood furniture from cracking.
  • Decrease chances of catching a cold or the flu, and improve your respiratory system health.

We took the time we needed to round up the best furnace humidifiers of the moment, consulting experts on the matter to make sure that the products we pick rise to expectations. We performed rigorous tests too so that we could establish with certainty how qualitative these humidifiers are and see exactly how they perform when it comes to humidity increase. If you want to make an informed decision, we encourage you to go through the following reviews and make up your mind regarding what system to acquire after analyzing each product closely.

Want to benefit from normal humidity levels throughout the house when the dry season comes? Then you should also look into these whole house humidifiers since one of these products might be better suited for your expectations.

Top 9 Furnace Humidifiers Compared

Photo Product Type Area Coverage Capacity Mounting Options Output Levels Auto Mode Construction Price

Best Overall
1. Aprilaire 800
Steam 6,200 sq. ft. 11.5 to 34.6 GPD Duct / Remote 6 Steel Check Price at Amazon

Best for Large Homes
2. Honeywell HM750A1000
Steam 5,000 sq. ft. 11 GPD on 120 VAC/ 22 GPD on 240 VAC Duct / Remote 1 Metal Check Price at Amazon

Editor’s Choice
3. Aprilaire 700
Fan-powered flow-through 4,200 sq. ft. 18 GPD Duct / Wall 6 Plastic Check Price at Amazon

Best for the Money
4. Aprilaire 600
Flow-through 4,000 sq. ft. 17 GPD HVAC / Duct 6 Plastic Check Price at Amazon
5. Honeywell HE360A1075
Flow-through 4,499 sq. ft. 18 GPD Warm air supply / Return air duct 1 Plastic Check Price at Amazon
6. GeneralAire 1000A
Flow-through 3,000 sq. ft. 18 GPD Warm Air / Return Air Plenum 1 UV-stable automotive grade plastic Check Price at Amazon

Best for Hard Water
7. Honeywell HE240A2001
Flow-through 3,000 sq. ft. 16 GPD Warm air supply / Return air duct 1 Plastic Check Price at Amazon
8. GeneralAire 1042-LH
Flow-through 2,800 sq. ft. 17 GPD Warm Air / Return Air Plenum / Right or Left Side 1 UV-Stable Automotive Grade Plastic Check Price at Amazon
9. Emerson HFT2100
Flow-through 2,100 sq. ft. 14 GPD Warm air supply / Return air duct 3 Thermoplastic

Explore more options when it comes to humidification products by checking out some ultrasonic humidifiers too. Cheaper to run and portable, models that rely on this technology are quite sought-after for their efficiency.

1. Aprilaire 800

Check Price at Amazon


Specifications:
  • Type: Steam
  • Area Coverage: 6,200 sq. ft.
  • Capacity: 11.5 to 34.6 GPD
  • Mounting Options: Duct/Remote
  • Output Levels: 6
  • Auto Mode:
  • Construction: Steel
  • Special Feature: Dual Sensor Auto Mode
  • Outdoor Temperature Sensor:
  • Water Panel:
  • Installation Kit Included:
  • Control Type: Digital
  • Dimensions: 7.1” x 10.1” x 20.9”
  • Warranty: 5 years


The best of the best, this model from Aprilaire remains a very popular choice despite its high price. Customers are willing to pay for quality, and this is exactly what it offers: indestructible steel housing and high-quality electrical circuits. It is versatile and can work either with a furnace or independently of a HAVC system. Moreover, the installation is easy even for profane users, as it comes with excellent instructions.

Powerful Electrode Technology

Flow-through systems use a vapor pad to transfer moisture into the air, a process that works excellent in small spaces, but a large home requires a strong technology, able to deliver excellent humidity levels. This unit works on simple but highly effective technology, namely it uses two electrodes, submerged in a canister with unpurified water. The impurities in the water act as a catalyst for the resistance created between electrical current and water and warm it until steam is released. The results are impressive:

  • Large home coverage – up to 6,200 square feet
  • Competitive moisture output – at least 11.5 gallons per day and up to 34.6 gallons per day
  • Low water consumption – as the water is evaporated, the waste is avoided

Another benefit of these types of humidifiers is that they offer a more user-friendly installation. The big flaw thou, that usually annoys the customers, is that the manufacturer requires for the installation to be performed by an expert, or, otherwise, the 5-year warranty becomes void. Although this is a common request on the whole-house humidifier market, it is the super simple and straightforward installation that doesn’t justify it in this case.

Automatic Mode

Although there’s nothing wrong with a manual system and this model allows you to make manual adjustments as well, nothing compares with the convenience an automatic can provide. If you are not convinced, just think about how ‘set it and forget it’ sounds. You will never have to check humidity levels, neither experience the effects of dry air, as it has it all covered. So, let’s take a look at the features that turn it into one of the most popular systems:

  • Dual sensor – monitors both the indoor relative humidity and outdoor temperature and adjusts the moisture output accordingly
  • Digital humidistat – provides accurate information about the humidity level, which is displayed on a LED monitor
  • Adjustable moisture output – it offers 6 output levels for manual speed selection

Although this technology seems complicated, the control panel is intuitive and easy to use, as it features only a power button and a few indicators that show if the canister is filling, releasing steam, or draining. The last icon will let you know when the canister needs to be replaced. Besides that, the thermostat is easy to figure out as well, as it only includes a knob for speed adjustment, 2 LEDs, one that shows that the unit is on, and one that lets you know when it is service time, and a LED monitor.

Low Maintenance

The canister needs to be replaced once a year to maintain the system performant, but it is easy to remove and generates low costs. As the system uses running water, you don’t need a filter, as bacteria and mold won’t have time to build up. Plus, this means that you won’t need to perform periodical cleaning, so what could be more convenient? The best news, though, is that you can use it with hard water. In fact, it is recommended for the water to be impure for the minerals to act as catalysts.

Are you rather interested in raising the humidity in a single space rather than the whole house? Then look into large room humidifiers since these are more fitting for the specific purpose you have in mind.

Aprilaire 800 Performance Ratings – Tester’s Feedback
  • Ease of installation: Having a professional come in to do the job will cost you money. We installed the humidifier ourselves to see how complicated the task is and establish whether or not it is possible for the regular DIYer to take it up on their own, saving money by doing so. Rating – 9.5/10
  • Area coverage: We used the humidifier to increase moisture in a building similar in size to the coverage claimed by the manufacturer to check the validity of the provided information. Rating – 10/10
  • Humidity increase: We ran the humidifier for 10 hours straight and checked moisture levels before and after using an indoor hygrometer. This way, we could see firsthand how big of a difference the system makes when it comes to solving the dry air issue. Rating – 10/10
We ran the tests in a newly constructed building where the humidity check we performed before commencing showed that air moisture levels were at approximately 31%. Installing the humidifier was a bit of a hassle time-wise since it took a while, but we followed directions closely and didn’t have much trouble with the procedure. After running the system for 10 hours, we checked moisture levels once more and the difference was quite impressive – a 10% jump in overall humidity. What we do recommend, however, is that you call in a professional to install it if you have even the slightest doubt regarding your capability to follow through with the task. It was a 3-person job for us and it did take a bit of time to finish it, and we have had previous experiences with HVAC systems, so we can’t say it’s necessarily a walk in the park.

Lillian Davies


PROS
  • Automatic mode uses a dual sensor to automatically adjust the steam output
  • Maintenance is easy and needs to be performed only once a year
  • Digital controls make it easy to operate
  • Suitable for hard water
  • Can cover large homes

CONS


VERDICT

A perfect choice for large homes, it uses electrode technology to produce a high amount of steam and is highly efficient in reducing the effects of dry air. The strong structure offers excellent protection for the system inside, ensuring a longer lifespan, while the special design encourages the use of unfiltered water.



2. Honeywell HM750A1000

Check Price at Amazon


Specifications:
  • Type: Steam
  • Area Coverage: 5,000 sq. ft.
  • Capacity: 11 GPD on 120 VAC/ 22 GPD on 240 VAC
  • Mounting Options: Duct/Remote
  • Output Levels: 1
  • Auto Mode:
  • Construction: Metal
  • Special Feature: Auto-adaptive technology
  • Outdoor Temperature Sensor:
  • Water Panel:
  • Installation Kit Included:
  • Control Type: Automatic
  • Dimensions: 21” x 8” x 10”.
  • Warranty: 5 years


Large rooms call for strong humidification systems that can cover their space, so a flow-through unit may not be performant enough to comply with these standards. In this case, a reliable steam model like Honeywell HM750A1000 is the best solution, as it uses innovative electrode technology to put out 11 to 22 gallons of moisture per day, being able to cover a surface of up to 5,000 square feet. The only option that is better than this Honeywell is the top-rated Aprilaire 800 that covers areas a bit larger than 6,000 square feet and uses steam in the operational process as well. It can be connected directly to a furnace duct or mounted on the wall and requires a supply voltage of 120 to 240 volts. It is easy to install and comes with a self-diagnosis function that makes maintenance a breeze. Not to mention that if you decide to make the installation yourself, you won’t have to struggle with complicated wiring, as it comes with push-in terminals.

It features dual sensors and uses auto-adaptive technology to keep up with changing weather conditions. The digital humidistat is included, and it allows you to set the desired humidity level or activate the Auto mode that will enable the unit to run independently. It is compatible with any Prestige IAQ, VisionPRO 8000, or Lyric thermostat and can be controlled from distance through a special app. Furthermore, the maintenance is made easier by the filterless design. The only thing you will need to replace once a year is a cylinder, a task that isn’t difficult to perform.

The power consumption reaches a maximum value of 3,000 watts, so it isn’t truly energy-effective. Nevertheless, you can set it running only when the humidity is getting low and thus save some money. On the other hand, it is one of the most effective when it comes to saving water with a water efficiency level of 80 to 90%. Moreover, it surprised us with its small footprint of 8 x 10 inches. Although it measures 21 inches in height, it remains extremely compact and we guarantee that you will easily find a place to mount it. The metal housing makes it highly resistant to environmental factors, so you can easily set it up in a garage or a basement. Apart from that, the startup and checkout are faster due to the pre-mineralized cartridge, so it can always be at your service.

The manufacturer offers a generous 5-year warranty and friendly customer support for your peace of mind. Plus, the peace of your house will be maintained as well, as this is one of the quietest models on the market, designed to provide comfort for the entire family and reduce dry air symptoms while passing unnoticed.

Looking for a cheaper humidifier that serves the purpose of moisture level increase in a smaller space, like a room in your home? Then a cool mist humidifier or a warm mist humidifier might be more appropriate for you.


PROS
  • Metal construction ensures a longer lifespan
  • Auto-diagnosis function for easy maintenance
  • Excellent water-saving efficiency
  • Small footprint
  • Large area coverage
  • Dual sensors

CONS
  • High power consumption
  • Replacement parts are fairly expensive, so upkeep will cost a pretty penny when it’s due


VERDICT

If you own a large house, you can pick this humidifier with confidence. It has a strong moisture output, is easy to install, and offers multiple smart functions. The innovative technology allows you to control it from distance, so you will be able to turn it on and off and monitor RH levels from your phone. Besides that, it is easy to set up and suitable for DIY installation.



3. Aprilaire 700

Check Price at Amazon


Specifications:
  • Type: Fan-powered flow-through
  • Area Coverage: 4,200 sq. ft.
  • Capacity: 18 GPD
  • Mounting Options: Duct/Wall
  • Output Levels: 6
  • Auto Mode:
  • Construction: Plastic
  • Special Feature: Dual Sensors
  • Outdoor Temperature Sensor:
  • Water Panel:
  • Installation Kit Included:
  • Control Type: Digital
  • Dimensions: 10.3” x 15.9” x 18”
  • Warranty: 5 years


Perfect for medium homes, this model caught our eye through its simple but very tight design and outstanding humidification capacity. The housing is made of durable plastic and, although it isn’t the most compact on the market, featuring a height of 18 inches and a width of 15,9 inches, you can find a good place for it, as the profile is rather slim at 10.3 inches. The installation kit is included in the price, but, as in the case of most whole-house humidifiers, the setup isn’t for everyone. Even customers with electrical knowledge have encountered difficulties, so it is better to call for an expert who will provide professional installation and allow you to keep your 5-year warranty. It can be installed either on a wall or attached directly to a duct from which it will capture the warm air and load it with moisture.

The model selected by us is automatic and comes with user-friendly digital controls, but you can choose the manual option as well, and save around $25. Nevertheless, the extra charge does make a difference, especially if comfort and convenience are a big deal to you. The automatic option comes with dual sensors that monitor both the temperature outdoors and the relative humidity indoors, adjusting the fan to cope with the values. It offers 6 output levels, so it allows you to manually control it if this is what you desire. In contrast, the manual model offers only one sensor, for humidity, and you will have to set the desired RH level manually.

The output rate is 18 gallons of moisture per day, which is huge and makes it perfect for areas with a dry climate. It will reach its maximum capacity in a home that is smaller than 4,200 square feet. This model is a viable alternative to the Aprilaire 800 that works for larger spaces. Since both models come from the same manufacturer, you needn’t worry about their durability or reliability considering that the company is one of the best when it comes to producing humidity-increasing systems. Regarding noise, as most humidifiers in its class, it is loud, especially as it comes with a fan, but, as you can place it far from your living space, in the basement or attic, you won’t have to deal with the noise. Moreover, if you set it on the Auto mode, the only time you will need to check on it is once a year when you will need to replace the water panel. You will be able to check if it is running with the glimpse of an eye, as the thermostat comes with indicator lights that show the running status and alert you if you need to service the unit.

PROS
  • Six moisture output levels make it highly customizable
  • Can cover medium to large homes
  • Maintenance is simple and needs to be performed only once a year
  • Auto mode
  • Reliable construction

CONS
  • Installation should be made by a professional
  • The solenoid valve doesn’t automatically close


VERDICT

Aprilaire products are among the most popular on the market, and they didn’t get here by chance, so you can rest assured that if you invest in this model your financial effort will pay off. It comes with high-quality housing and dual sensors that make it both reliable and convenient. Besides that, it is highly performant and a great pick if you live in the Northern parts.



4. Aprilaire 600

Check Price at Amazon


Specifications:
  • Type: Flow-through
  • Area Coverage: 4,000 sq. ft.
  • Capacity: 17 GPD
  • Mounting Options: HVAC/Duct
  • Output Levels: 6
  • Auto Mode:
  • Construction: Plastic
  • Special Feature: Blower Activation Switch
  • Outdoor Temperature Sensor:
  • Water Panel:
  • Installation Kit Included:
  • Control Type: Digital
  • Dimensions: 10.2” x 15.4” x 15.8”
  • Warranty: 5 years


Aprilaire is known to produce high-quality humidifiers that come at good prices, and this unit is an excellent example. The coverage area of 4,000 square feet and the outstanding 17 GPD mist output make it suitable for medium homes or more loose small homes. It is indeed very similar to the Aprilaire 700, so you might have a bit of trouble deciding between the two. The flow-through design is budget-friendly and simple to understand. The humidistat measures the humidity in your house and, when it drops under the selected value, the solenoid valve opens, allowing the water to enter the humidifier through the top, flow down, and wet the pad. After this operation, it will drain out through a tube.

The second part of the operation is completed by the air from the furnace, which crosses the pad and absorbs moisture, which is further released into the air. This operation can be performed automatically every time more humidity is required if you select the Auto mode, which uses 2 sensors to monitor both the RH and temperature outdoors, and automatically adjusts the mist output. Nevertheless, you can manually select humidity levels and power the system on and off, as you wish.

The installation kit is included, and the installation is fairly easy if you have practical skills, but, once again, we recommend calling for an expert that can safely install your new humidification system without voiding the 5-year warranty. The plastic housing is sturdy and compact, with a height of only 15.8 inches, and a footprint measuring 10.2 x 15.4 inches, so it is easy to maneuver during the setup. Furthermore, once you get everything in place, maintenance is a breeze, with only the water pad requiring replacement once a year.

It comes with digital controls that allow you to easily set the desired relative humidity value or the moisture output by selecting one of the 6 levels available. A LED screen will display your selections and temperature and humidity measurements. Furthermore, the panel includes a set of indicator lights that will let you know when the unit is on, when it’s time to replace the water panel, or when you need to call for a technician to fix an eventual malfunction.

PROS
  • Dual smart sensors monitor both outdoor temperature and indoor humidity
  • Digital controls
  • Large humidification capacity
  • Great 5-year warranty
  • Easy maintenance

CONS
  • Most units come with loose connections, but they can be easily fixed
  • Some users complained that the installation process was more difficult than they initially expected


VERDICT

Aprilaire is the inventor of the whole-house humidifier, and they have maintained or improved their standards over years, so you can rest assured that this model is reliable and the warranty will be honored, as long as you call for an expert to handle the installation. Furthermore, as it comes with a digital panel, it is easy to control and can be set to run automatically if you don’t wish to power it on and off yourself any time you need to add more moisture or reduce the humidity level.



5. Honeywell HE360A1075

Check Price at Amazon


Specifications:
  • Type: Flow-through
  • Area Coverage: 4,499 sq. ft.
  • Capacity: 18 GPD
  • Mounting Options: Warm air supply/Return air duct
  • Output Levels: 1
  • Auto Mode:
  • Construction: Plastic
  • Special Feature: Easy installation
  • Outdoor Temperature Sensor:
  • Water Panel:
  • Installation Kit Included:
  • Control Type: Manual
  • Dimensions: 10.25” x 14” x 15.25”
  • Warranty: 1 year


There are two reasons for which we have placed this model among our favorites. First of all, it flaunts the high-quality construction that is specific to all Honeywell products, including the Honeywell HM750A1000 that we chose as our runner-up because of the large area coverage and considerable moisture output capacity, so it is unlikely to experience often malfunctions caused by external factors, even if it is installed in a tougher environment like a basement or an attic. Secondly, we have appreciated its simple design that makes maintenance easy to perform and the setup more accessible to profane users. It can be installed on any warm air supply or return duct of a forced-air furnace and is an excellent choice for multi-stage HAVC systems, as it can pair with them and adjust its run according to their hours of functioning and speeds. It is a flow-through model and will run only when the heating/cooling system is on.

Regarding installation, we must specify that it doesn’t come with an installation kit, so you will need to spend extra to purchase it. While the instructions aren’t the clearest, you can try to set it up yourself, but you would have to have a practical mind to understand all the technical specifications. Moreover, if you take installation into your own hands, you should know that you will void the warranty, which is only one year, though, so the sacrifice won’t be too big. Nevertheless, if you can find an expert that can help you install it at a good price, we recommend choosing this option, as, this way, you will avoid the trouble of wiring it.

Regarding its capacity, we can only state that it is great, with a moisture output of up to 18 gallons per day that can performantly cover a home of up to 4,499 square feet. On the other hand, it is compact, measuring only 15.25 inches in height, 14 inches in width, and no more than 10.25 inches in depth, so it was specifically designed to fit in tight spaces. Regarding maintenance, the only operation you will need to perform concerns the replacement of the water panel and only needs to be done once a year. The extra water is evacuated to prevent mineral deposits and ensure a longer lifespan. Apart from that, it comes with a distribution tray that will help you save water and money.

PROS
  • Strongly built, is up for many years of performant run
  • High moisture output makes it suitable for medium to large homes
  • Reduced water consumption
  • Easy maintenance
  • Compact design makes it easy to fit in narrow spaces

CONS
  • The installation kit isn’t included
  • The instructions aren’t easy to understand


VERDICT

It is an automated model that can pair perfectly with multi-stage systems that offer variable speed. The construction is strong and makes it a great choice if you are going to set it up in a basement, an attic, or a garage, as it can successfully resist the harsh conditions in these spaces. Additionally, as it automatically evacuates the excess water, you will never need to perform any difficult cleaning operations, just to replace the water panel periodically.



6. GeneralAire 1000A

Check Price at Amazon


Specifications:
  • Type: Flow-through
  • Area Coverage: 3,000 sq. ft.
  • Capacity: 18 GPD
  • Mounting Options: Warm Air / Return Air Plenum
  • Output Levels: 1
  • Auto Mode:
  • Construction: UV-stable automotive grade plastic
  • Special Feature: Highly-evaporative vapor pad
  • Outdoor Temperature Sensor:
  • Water Panel:
  • Installation Kit Included:
  • Control Type: Digital
  • Dimensions: 21” x 19” x 18”
  • Warranty: 10 years


This is a highly qualitative whole-house humidifier and comes with one of the best warranties on the market. At 10 years being offered for repairs, you will probably want to call for an expert to install it, so the warranty doesn’t get voided. Plus, the instructions aren’t that easy to figure out, except if you have practical skills, so it’s truly worth paying for the installation. It can be placed either on the warm air or return air plenum and is fairly compact, with a height of only 21 inches and a footprint of 19 x 18 inches, so you won’t need to struggle to find it a good place. Furthermore, as it comes with a UV-stable automotive-grade plastic housing that is one of the most resistant in the industry, it will last for a long time, even if you place it in your garage or basement, where the environmental conditions are harsher.

The technology is simple. Some of the hot air released by the furnace enters the humidifier where it is filtered through a VaporPad. The VaporPad is soaked in water and transfers moisture to the air, which is then returned into the room. The VaporPad acts as a filter for the minerals as well, preventing them from invading your house and lungs. Moreover, as the system evacuates the excess water, it prevents it from getting stale and spreading an unpleasant smell around the house. This system limits mineral build-up as well.

The maximum moisture output is 18 gallons per day and will be reached in spaces as large as 3,000 square feet, so it is more suitable for cozy little homes than large mansions. It is fan-powered and, while this means that it will circulate the air faster, it means that the sound level will be increased as well. But, unlike classical evaporative humidifiers that need to be in the room to work, this can be installed in the basement, garage, or a special room, so you can keep the noise out of the bedroom.

Another attractive feature is the digital panel. It comes with 2 sensors, one that measures the temperature outdoors and the second for humidity monitoring. Thus, if you select the Auto mode, it will automatically adjust the moisture output according to the weather outside and the dryness of the air inside. A LED display will inform you about the measurements, which, according to the customers’ reviews, are accurate.

PROS
  • Excellent 10-year warranty
  • High moisture output
  • Smart sensor monitors the temperature outdoors
  • Digital humidistat provides accurate data
  • Auto mode

CONS
  • It is difficult to install and requires the hand of an expert for the warranty to remain active
  • The fan is a bit noisy


VERDICT

The quality of this model is exceptional, and we must admit that everything has been carefully crafted and no corners were cut. It is strongly built and comes with dual sensors that make it very practical. Besides that, although you will need to pay for an expert to install it for you, you will get a 10-year warranty, which is one of the most generous on the market.



7. Honeywell HE240A2001

Check Price at Amazon


Specifications:
  • Type: Flow-through
  • Area Coverage: 3,000 sq. ft.
  • Capacity: 16 GPD
  • Mounting Options: Warm air supply/Return air duct
  • Output Levels: 1
  • Auto Mode:
  • Construction: Plastic
  • Special Feature: PerfectFLO water distribution
  • Outdoor Temperature Sensor:
  • Water Panel:
  • Installation Kit Included:
  • Control Type: Manual
  • Dimensions: 18.7” x 15.7” x 15.3”
  • Warranty: 1 year


If you are on a budget, a simple but high-quality unit can help you acquire the desired humidity level without leaving your pockets empty. We loved this model’s compact design that allows it to fit in any narrow space near the furnace. It measures 18.7 inches in height, 15.7 inches in width, and 15.3 inches in depth, so it is easy to maneuver during installation as well. You can mount it either on the warm air supply of the furnace or directly on the return air duct. Nevertheless, as in the case of most models, you will need the assistance of a professional, otherwise, you will void the 1-year warranty. The good news, though, is that the installation kit is included, so you won’t need to spend extra money on the hardware.

It was designed for small houses with a surface of up to 3,000 square feet, and it will work best if used in tight spaces. If you want an alternative for this model that can cover larger spaces, we recommend the Honeywell HE360A1075 since it’s rated at approximately 4,500 square feet coverage. The maximum moisture output reaches 16 gallons per day, which is highly competitive, especially if you consider the price. It uses one of the most performant technologies available to save water and, as it is a flow-through model without a fan, the power consumption is minimum. The water-saving technology is called PerfectFLO, and it ensures that only the required amount of water is going through. Nevertheless, you should regularly get the system checked by an expert to make sure everything is working properly.

You can choose to set the humidity level yourself or let it run on the continuous mode and forget about it. It does offer this option. As it comes with a water panel, all the mineral residues will be captured so the returned humid air won’t carry with it any white dust, even if you live in an area with hard water. You just need to replace the water panel once a year to keep it functioning in optimal conditions. Furthermore, if you worry that it will make a lot of noise, as it is bigger than an evaporative humidifier with a water recipient, you are right. But, as you won’t place it in the bedroom, it is highly improbable that you will even hear it during your sleep. And you always have the possibility of turning it off during your rest hours.

PROS
  • PerfectFLO technology reduces water consumption
  • Easy to install, as the manual is straightforward
  • Offers a continuous mode
  • Complete installation kit included
  • Easy to operate

CONS
  • Only 1-year warranty
  • Someone complained that the cut-out template is undersized, making the installation more difficult


VERDICT

If you are not willing to put up with expert installation and going to do it yourself, this model is probably the best choice, as it comes with a short 1-year warranty, so you will not have too much to lose. Plus, once installed, it is easy to control and can offer good moisture for the entire house with minimal water consumption.



8. GeneralAire 1042-LH

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Specifications:
  • Type: Flow-through
  • Area Coverage: 2,800 sq. ft.
  • Capacity: 17 GPD
  • Mounting Options: Warm Air / Return Air Plenum / Right or Left Side
  • Output Levels: 1
  • Auto Mode:
  • Construction:UV-Stable Automotive Grade Plastic
  • Special Feature: Sturdy construction
  • Outdoor Temperature Sensor:
  • Water Panel:
  • Installation Kit Included:
  • Control Type: Manual
  • Dimensions: 18” x 14” x 14”
  • Warranty: 5 years


It is one of GeneralAire’s most popular flow-through models, as it comes with strong construction and a complete installation kit. It is suitable for small houses with a maximum surface of 2,800 square feet where it can deliver an excellent moisture output of up to 17 gallons per day. It measures 18 inches in height, 14 inches in width, and 14 inches in depth, so it has a compact design that makes it easy to fit in any narrow space you might have available. The housing is made of UV-stable automotive-grade plastic that makes it highly durable against tough environmental conditions. Moreover, as it comes with a manual humidistat, it is less prone to malfunctions, so it won’t generate high repairing costs when the warranty time is over.

It can be installed either on the warm air duct, return air plenum, on the right or left side, and is dependent on the furnace. This means that it will turn on only when the furnace is on and will shut down when the furnace’s action is over. Therefore, it will save both energy and water, as the humidity tends to get low when the HAVC installation is in use, so it will act only when humidification is most required. The manual humidistat is included in the package, and it will allow you to set the desired humidity level.

The installation can be tricky if you don’t have some plumbing knowledge. It is best to leave it to the hand of a specialist, who will perform professional installation and save your 5-year warranty. In case you insist on doing it yourself, you should know that the manufacturer won’t honor the warranty. Nevertheless, once installed, you will soon discover that it is easy to control, and maintenance is a breeze. The principle is simple. A part of the heated air produced by the furnace is drawn through a VaporPad that is positioned inside the unit. As the VaporPad is soaked with water, the air collects moisture and then returns into the room, creating a comfortable environment. The pads are durable and need to be replaced only once a year. Plus, they act as filters for bacteria and mineral residue, so the unit can be used with hard water.

PROS
  • Compact design makes it suitable for narrow spaces
  • Strong plastic construction
  • The manual humidistat is easy to operate
  • Great 5-year warranty
  • High moisture output

CONS
  • Requires professional installation, otherwise, the warranty is voided
  • Doesn’t feature an Auto mode


VERDICT

A simple but highly efficient system, it is a perfect choice for small homes. The manual humidistat is straightforward and makes it user-friendly, while the VaporPads act like filters for minerals, preventing it from releasing white dust into the air. Moreover, as it functions only when the furnace is on, you won’t need a timer to save energy and water.



9. Emerson HFT2100



Specifications:
  • Type: Flow-through
  • Area Coverage: 2,100 sq. ft.
  • Capacity: 14 GPD
  • Mounting Options: Warm air supply / Return air duct
  • Output Levels: 3
  • Auto Mode:
  • Construction: Thermoplastic
  • Outdoor Temperature Sensor:
  • Water Panel:
  • Installation Kit Included:
  • Control Type: Manual
  • Dimensions: 13-1/2” x 9-5/8” x 12-1/2”
  • Warranty: 1 year


Needless to say, since the max coverage of this Emerson humidifier is 2,100 square feet , chances are that you can count on it to stabilize moisture levels in your whole house. The peak output per day is 14 gallons, so you can see where it gets its power to handle vast spaces.

This bypass flow-thru system measures 13-1/2 inches by 9-5/8 inches by 12-1/2 inches, the fact that it’s a low profile model making it perfect for installation when space is limited. It flaunts a thermoplastic built for the cabinet, so you won’t have to worry that it might corrode, warp, or rust with time. The plenum opening measures 9 inches in width by 10 inches in height. Thus, it is suited for narrow plenums, which is perfect since most modern plenums measure 10 inches max.

Another installation aspect that delights is that the side panels are reversible and feature snap-lock fittings. This allows you to change from left to right side bypass installation as needed. Speaking of installation, the mounting template, hardware, and instructions are included with the package. Thus, as soon as you receive your order, you can set it up and finally benefit from regulated indoor humidity levels. Last but not least, Emerson, a brand known for its commitment to quality, covers the product from defects for 1 year.

PROS
  • The reversible snap panels allow left or right side bypass installation
  • The exterior build withstands rust and corrosion
  • Allows non-level plenums due to its upgraded wicking and water distribution system
  • Comes at a very accessible price

CONS
  • Setting it up can be a tricky task for the uninitiated
  • Lower moisture release as opposed to its competitors


VERDICT

Perfect for the narrow plenums of today, this Emerson model is an option you ought to consider if the space you intend to use it for is an estimated 2,100 square feet. What makes it all the more appealing though is the cheap asking price that makes it a suitable option for a wider range of customers.



Furnace Humidifier Installation Tips


While it isn’t the most difficult of installation jobs you could do at home, setting up a furnace humidifier is indeed a task for which you need a little know-how and increased attention. If you have decided that you want to give it a go and save some money since you won’t have to call in a professional for the task, aside from closely following the steps and tips in the accompanying instructions manual, there are a few other aspects to take into consideration too.

What you should consider before installing the humidifier:

  • Placement: To benefit from optimal performance on the humidifier’s part, you ought to pick the right spot to install it. With some models, this ideal place is on the ductwork supply side, while other models need to be installed on the return side. What all have in common though from this point of view is that they need to be close to an electrical outlet and to the water supply. Make sure that you keep the humidifier away from other HVAC systems too, like the AC, for example.
  • Ductwork openings: It relies on the air supply of your house to work, so you must cut into the ductwork. You might also have to make other cuts for its parts, like the humidistat. Make sure that you carefully cut these openings and secure them so that air won’t escape from the ducts.
  • Water supply connection: It needs to get the water that it uses to moisturize the air from somewhere, right? With furnace humidifiers, that place is the water supply of your home. When you connect the unit to the water supply, be careful to not cause water leaks in the pipes or the humidifier.
  • Wiring: If you don’t pay close attention when you wire and connect the unit to the power supply, there’s the risk of a fire hazard occurring.

Common mistakes you should avoid during installation:

  • Think ahead when it comes to maintenance: There won’t be much maintenance work to follow through with in the long run. However, there is occasional cleaning and servicing required. To keep the unit up and running perfectly, we recommend that you check to see that the supply and drainage plumbing are OK beforehand.
  • Size it right: This is the first thing you have to take into account, hands down. Proper sizing is quintessential since, without it, you risk acquiring a humidifier that isn’t able to deal with the vast surface it has to raise moisture levels in.
  • Take into account the unit’s particularities: Not all products are the same or function properly under the same conditions, and this is an aspect that you must look into before you pick your unit preferably. Some models, for example, have functioning issues if they must deal with hard water. If the water running through the pipes in your home is hard and you don’t want to spend money on a softening system that will solve this issue, you’d better look into a product rated to have no issues from this point of view.

Conclusion

Our analysis has reached the end, so now it’s time for conclusions. The ranking was made according to each product’s capacity, construction, and reliability, and there’s no doubt that the first places are more performant than the others. Nevertheless, you should take into account that they were designed for larger houses, so if your living place is smaller, a model placed on a median or lower position could be more suitable. It’s time now for you to make your own ranking according to your house’s size and budget, so don’t hesitate to take a second look at 5 of the most popular models in this top:

Best Furnace Humidifier for Sale: Aprilaire 800

It has an impressive capacity and is one of the best choices for large homes. The steel construction offers increased protection against mechanical factors, while the automatic mode makes it extremely convenient. The controls are straightforward and allow for easy speed adjustments and RH monitoring. Furthermore, it features two mounting options and can be used either with or without a HAVC system. Although is it more expensive than other models, it is regarded among customers as a reliable model that is worth the investment.

Editor’s Choice: Aprilaire 700

Just like the previous model, it offers automatic adjustment and uses a dual-sensor to monitor both the temperature outdoors and the humidity level indoors. The humidistat is accurate and provides real-time readings, which are shown on the LED monitor. There are some differences thou, as it is a flow-through model and uses a pad to fill the air with moisture. Nevertheless, it is super-performant, and we recommend it for medium homes.

Best Furnace Humidifier for the Money: Aprilaire 600

Aprilaire is once again high in the top and among our best recommendations, this time for the excellent quality-price report offered by this model. It comes with all the excellent features of its bigger brother, the 700, but is designed for smaller homes where it can create a comfortable atmosphere. The Auto mode and digital controls are still on the table, as well as the 5-year warranty.

Best Furnace Humidifier for Hard Water: Honeywell HE240A2001

What makes this product effective even if hard water circulates through it is the water panel that captures mineral residues. Due to this design detail, you are exempt from having to deal with white dust on the surfaces once you turn the humidifier on. The panel will require replacement every 12 months, but it’s not a hefty investment so you needn’t worry about upkeep costs. If you have a 3,000 square feet home that needs the services of a moisture-enhancement system, and you are aware of the fact that hard water is an issue with your water source, then this Honeywell model is the option you ought to use.

Best Furnace Humidifier for Large Homes: Honeywell HM750A1000

It features an excellent moisture output, which is an essential feature, but it doesn’t stop here. The most convenient in our top, it comes with a dual-sensor and auto mode to monitor temperature and humidity and automatically adjust the mist output. Furthermore, it can be controlled from distance by installing a compatible app on the phone.

Lillian Davies
Lillian Davies
Lillian is a fresh college graduate who has lived in Tucson for most of her life, battling the torrid heat ever since she was a child. She is quite versed in the topic of thermal comfort and what solutions work to make conditions more bearable when the temperatures go haywire, which makes her knowledgeable in the topics she writes about here. Since she is a perfectionist, Lilian always takes time to polish her articles before release, which makes her an irreplaceable part of the team.

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