Best humidifiers for large rooms’ auto fill

There is nothing as convenient as using a humidifier suitable for large rooms yet auto refill, as a result, prevent dry skin, nose bleeds and other horrible effects of dry air.

Large rooms auto refill humidifiers are necessary to alleviate the stress and difficulty in refilling humidifier water tank from time to time especially for sick people, old people and people living with one form of disability also if you are not always around, hence,  it is imperative to get humidifiers for large room auto refill.

Also get it if you are expecting a baby for uninterrupted moisture in the home, you know babies skins are too fresh to withstand unsuitable weather so they need all the care they can get and obtaining a humidifier for large rooms auto refill is among the cares. Also large room humidifier will keep your plants as well as wooden structures healthy.

The best humidifier for large room auto refill must cover room size up to 800 sq ft, and of course, able to connect the water line effectively. Moreover, most auto refill humidifiers require professional installation, and if you are savvy in plumbing, wiring, or pro in humidifier installation then no need to hire a pro to help install the product.

And if you are a DIY kind of person you can follow the manufacturer’s guide to install the humidifier, some manufacturers installation guide is easy to follow. However, it is advisable to let a professional handle the installation, if one does not possess the required experience.

Anyway, what landed you on this page is “best humidifiers for large rooms’ auto fill” to moisturize your home with auto refill operation. Good news! You will get them here and choose as it suits you.

Summary of reviews

Product nameSize (sq ft)Output Capacity Dimension
Product link
Skuttle 190-SH1 Drum Humidifier1848 to 404817 gallons per day11.7 x 10.8 x 10.9
Aprilaire 400 Bypass Humidifier 40000.7 GPH16 x 11 x 16
Aprilaire 700 Automatic Humidifier42000.7 GPH16 x 11 x 18
Aprilaire 500 Humidifier, 24V Whole House Humidifier w/ Auto Digital Control Bypass Damper .5 Gallons/ hour 30000.5 GPH16 x 10 x 13
Honeywell HE360A Whole House Powered Humidifier 420017 gallons per day21.2 x 17.5 x 16.2

Skuttle 190-SH1 Drum Humidifier


Skuttle drum humidifier will humidify the rooms in your house regardless of the tightness or looseness of your house. It will humidify loose house up to 1848 sq ft, average house-2,576 sq ft and tight house up to 4,048 sq ft with great functionality yet at a reasonable price with the moisture output of 17 gallons per day at 120oF.

You can connect this unit directly to the water line and it offer easy installation with the reversible components and snap-lock fittings.

The unit is designed with durable thermoplastic cabinet to prevent corrosion, warping and rusting. And the interior is designed to enable easy cleaning or replacement, but ensure you use the skuttle automatic flushing timer especially in hard water areas.

You can install this unit on either side of the forced air intake also designed to mount on the duct. It comes with a humidistat to monitor and control the humidity of the air.  And you have some cash to save on your electricity and water bill with this humidifier for it is energy efficient and uses low water.

Features include:

  • Has output capacity of 17 gallons per day at 120oF
  • Coverage area (SQ FT): Loose area: 1848; average house, 2576; tight house, 4048
  • Water feed rate: 7 GPH
  • Voltage-24 VAC
  • Power -3 watt
  • It has 1 revolutions per minute ( RPM)
  • Dimension: 11.7 x 10.8 x 10.9 inches
  • Weighs 9.7 pounds
  • It has 6 inches start collar summer shut off


  • Provides easy installation
  • Energy efficient
  • It uses minimal water
  • Easy to clean
  • Prevent corrosion and rusting
  • Affordable

  • N/A

Aprilaire 400 Humidifier Bypass


Aprilaire humidifies a tightly constructed home up to 4000 sq  ft with 0.7 gallon evaporation rate also provides minimal water usage, which makes it suitable for drought prone areas.

This humidifier requires routine check just like every other machine, especially when subjected to heavy use- you need to check the plumbing and water line, for cracks or leaks and provide prompt replacement to damage parts.

This humidifier will take care of every person in the house including the furniture to prevent cracks and to protect plants also alleviate dry skin and nasal congestion.

This humidifier is a drainless option so the installation should be easy for it makes use of gravity instead of pulleys and wheels to pull water inside the unit, it also requires low maintenance

Everything about this humidifier is automatic, but, I don’t think you except less anything less than that since it has automatic digital control. For instance, the temperature sensor enables the humidifier to control the humidity function. It also has a humidity sensor that allows the unit adjusts to suitable humidity level, as a result, you don’t have to monitor or change the humidity levels for it will automatically adjust to the suitable level.

This unit can be installed in a gas furnace or heat pump, and it can be used with hot water. Moreover, using hot water will increase the rate of evaporation.

Features include:

  • Evaporating capacity of 0.7 gallon per hour
  • Area coverage: 4000 sq ft
  • Weighs 8.8 pounds
  • Minimal water wastage
  • Automatic digital humidity control
  • Dimension: 16 x 11 x 16 inches


  • Easy installation
  • Doesn’t waste water
  • Automatic control

  • N/A

Aprilaire 700 Automatic Humidifier


Aprilaire 700 automatic humidifier humidifies a tightly constructed home up to 4200 sq ft in size with automatic control.

The automatic digital humidifier control enable humidifier to control humidity to the most suitable and comfortable level. This means you don’t have to monitor humidity settings from time to time.

The temperature and relative humidity can also be control manually and it quietly moisturizes your environment to prevent and remove allergies, dry skin, chapped lips, cracked skin, and static electricity, also perfect for kids and pets.

And it has an evaporation rate of 0.75 gallon per hour- one of the best evaporation rates you can get from humidifiers. It requires low maintenance and it is easy to install even without employing a professional installer. Just follow instructions on user guide provided you are a good DIY.

Features include

  • Evaporation rate of 0.75 GPH
  • Area coverage: 4200 sq ft
  • Provide automatic digital humidifier control and manual settings
  • Dimensions: 16 x 11 x 18 inches
  • Weighs 15 pounds


  • Easy to install
  • Comprehensive user guide
  • Easy to use

  • N/A

Aprilaire 500 Humidifier, 24V Whole House Humidifier w/ Auto Digital Control Bypass Damper .5 Gallons/ hour


Aprilaire 500 is automatic digital control humidifier to raise the humidity of a house up to 3000 sq ft with water feed rate of 0.5GPH and evaporative rate of 0.5GPH, but it can also be installed in  manual mode.

You can connect it to either the cold water line or hot water line depending on your choice. And this is a relatively easy installation for a good DIYer to begin get optimum relief from itchiness, nose bleed, and static electricity.


Features include:

  • Dimension: 16x10x13 inches
  • Built-in by pass damper
  • Weighs 1.28 ounces
  • Water feed rate of 3.0GPH
  • Evaporative rate of 0.5GPH
  • Comes with outdoor sensor and water pad


  • Easy to install
  • Easy to use
  • Automatic control

  • N/A

Honeywell HE360A Whole House Powered Humidifier


Honeywell HE360A features flow through design to ensure clean humidifier with low maintenance and it utilizes minimal water with rooms humidification up to 4200 sq ft size to prevent dry skin, static electricity and cracking in wooden structures.

This humidifier works perfectly well with furnace to ensure comfortable humidity level.  This humidifier has a compact design to allow mounting on the warm air supply or return air duct and the fan in the unit will draw warm air for water absorption into the air also blows heated air through the damped filter to force humid air into the duct.

And it is easy to hook up to the water supply, however, the screen filter can get clog, especially when use with hard water so ensure you do routine check and maintenance on the product. However, it requires professional installation; installation also requires installation kit which is sold separately.

Features include:

  • Provides fan powered flow through
  • Can fill room size up to 4200 sq t
  • It has a flow through design
  • Weighs 18 pounds
  • Dimensions: 21.2 x 17.5 x 16.2 inches
  • Output capacity of 17 gallons per day


  • Easy to install
  • Minimal water usage
  • Offers diferent mounting options

  • Screen filter can get clog




Humidifiers for large rooms’ auto refills are great to provide convenience I.e., no need of manual refilling. However, these humidifiers need professional installation, and unless you are a good DIYer, you shouldn’t attempt the installation.


These humidifiers are effective to raise the humidity level of large rooms, as a result, prevent dry skin, sinuses and nose bleeds also keep the furniture healthy.