Aprilaire 700 - Fan Powered Humidifier 18 GPD with Automatic Digital Humidistat

SKU 700

  • 4200

Aprilaire 700 Power Humidifier. This product is a brand new genuine Aprilaire humidifier.
  • Actual Square Footage: 4200
  • Actual Gallons Per Day: 18
  • Drain Required: Yes
  • Control: Automatic Digital
Technical Specs

  • Brand: Aprilaire
  • Genuine OEM Product: Yes
  • Type: Power Humidifier
  • Control Type: Automatic
  • Coverage: Up to 4,200 sq. ft.
  • Water Panel: Aprilaire #35
  • Evaporative Rate: .75 Gallons Per Hour
  • Electrical: 24V
  • Product Measurements: 15.9" W x 18" H x 10.34" D
  • Plenum Opening: 14.75" W x 14.31" H
  • Includes: 24V VAC Transformer, Automatic Digital Humidistat, Remote Temperature Sensor, Saddle Valve, 1 Aprilaire #35 Water Panel

Same Day Shipping On Orders Placed Before 5:00 PM EST


Aprilaire 700 Power Humidifier

This product is a brand new genuine Aprilaire 700 Power Humidifier perfect for adding comfort to your home!

This Aprilaire humidifier is designed to humidify up to 4,200 square feet and is installed in your central heating and cooling system.

If you have any questions regarding this product please feel free to email Sales@Humidifiers.com or call 1-800-707-8159 and one of our friendly Customer Experience Representatives will be more than happy to help.


  • Manual Mode Resistor
  • Easy to Read Automatic Digital Control
  • Delivers up to 50% more moisture in comparison to other competitive units
  • Outdoor Temperature Sensor Informing Your System of the Most Accurate Humidity Level
  • Automatic Alerts Reminding You to Change the Water Panel Making Maintenance Easy and Worry Free

Customer Reviews

Aprilaire 700

February 14, 2014


I am totally satisfied with this product. Works better than other brands it replaced. Get the digital system. Highly recommend it and buying it from Humidifiers.com. They were prompt in handling my order and getting it to me.

Great product! Fast Shipping! Easy Install!

January 6, 2013


I purchased the Aprilaire 700 from Humidifier.com over the holidays. There was a little delay in processing my order, but it was very understandable since it was the holidays. One processed I got got my order quickly. The price was great and the shipping was quick!

I installed the Aprilaire 700 myself to my Rudd 80% furnace. I hooked the Aprilaire to a hot water line and mounted it on the supply duct. I didn't use the supplied digital control, instead I hooked the humidifier up to my 2nd generation Nest thermostat. I have no experience with HVAC but was able to do everything myself in about 6 hours of work including trips to the store etc.

Be aware that if you don't have a humidifier installed you will be to buy some items as stated in the instructions. It cost me about $125 in parts to install, but I had to buy some extra things like a relay and new thermostat wire because of my Nest Setup.

After 12 hours of use my house went from 12% humidity to 35% humidity. It's working well with or without the furnace being on. I can already notice a change and it's a very nice luxury to have.

I highly recommend this item so far and humidifiers.com. I also recommend installing yourself if you are handy.

Aprilaire 700

December 12, 2012


I have my unit set to the #4 setting and within 2 days my house went from 18% to 35% rh. I have an older house with a lot of natural oak so I was relieved when the humidity came up so quickly. If you are planning to install it yourself you will need some extra supplies like tin shears, 1/2" drain hose, and thermostat wiring. There is quite a lot to wire up since this unit works in unison with your furnace blower. However, once the unit is installed it is completely automatic. One feature that I really liked was that because it has its own fan, the warm air from your furnace is simply circulated through the unit and back into the duct. This eliminates the intake port that most similar units have. The only negative thing I can say is that the unit is not completely powered by the 120v plugin. You must install a 24v transformer (included with the humidifier) and wire up a separate circuit to operate the solenoid valve that turns the water on to the unit.

Good Product @ Great Price

November 17, 2012


After dealing with 3 small in-room humidifiers I decided to take the plunge to a whole house. It wasn't an easy install because of my down-flow furnace duct work arrangement, but once I figured that out it was easy. It arrived quickly and took me 6 hours to install, plumb, and wire. Works great so far. Love the automatic features. Set it and forget it!

Fast shipping.

September 18, 2012


Well, after about two years of stalling on buying a whole home humidifier, I finally decided on the Aprilaire 700. After checking some online retailers, I was extremely glad to find the absolute best deal on the humidifier here and the best pricing on shipping. Also I ordered this on a weekend, and got the product the next Wednesday. Thank you Humidifiers.com for excellent pricing and service! B

Fast Shipping

September 14, 2012


We are very satisfied with our dealings with Humidifiers.com. Delivery was made in a good time span. Thank you.

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