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If you are looking for a great crawl space or basement dehumidifier the Aprilaire 1820 dehumidifier is quickly becoming one of our best sellers online for many DIY projects. This product's sleek design mixed with its low weight, compared to other dehumidifiers, makes it easier to get in a tight crawl space or uses a smaller footprint in a basement humidity application. It is also a very powerful dehumidifier able to remove 70 pints of moisture per day just like its quieter and a bit larger counterpart the Aprilaire 1830 dehumidifier.

Aprilaire 1820 Frequently Asked Questions

  • How many Pints per day does the Aprilaire 1820 Dehumidifier remove?
    • Removes up to 70 Pints (8.8 gallons) of moisture per day!
  • How much does the Aprilaire 1820 Dehumidifier weigh?
    • Light Weight – At 56 pounds, the unit is easy to maneuver and position during installation and setup.
  • Will the Aprilaire 1820 Dehumidifier fit in a tight crawl space?
    • Perfect for tight spaces — Compact design (12.5” x 12.5” x 25”) allows you to install humidification solutions in cramped crawl spaces.
  • Does the Aprilaire 1820 Dehumidifier display the humidity or use a turn knob?
    • Digital RH control— Do away with the wide variances typically seen with a mechanical dial and know that the space is being maintained at the desired humidity level.
  • How much air does the Aprilaire 1820 Dehumidifier move?
    • Powerful 200 CFM Blower — Maximum airflow allows for faster and more consistent environmental control in the space.
  • Is the Aprilaire 1820 Dehumidifier Energy Star Rated?
    • Meets Energy Star requirements resulting in an energy efficient unit that minimizes the impact on your utility bill.
  • Can I hook up and control the Aprilaire 1820 Dehumidifier with my smartphone?
  • Doe the Aprilaire 1820 Dehumidifier have to be hardwired?
    • No, it plugs into a 115V outlet
  • Where is the Aprilaire 1820 Dehumidifier made?
    • MADE IN THE USA - Engineered and manufactured in Madison, WI, USA
  • Can I duct the dry air into my HVAC system?
    • Yes, Use Freestanding or Inlet and Outlet duct collars come standard - Ducted with 8" flex duct or hard pipe (not included)
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About Michael Church

Michael Church has been involved with indoor air quality since 2005 and feels the unhealthy crawl space is one of the major problems causing poor indoor air quality.


  1. D on July 29, 2019 at 12:14 pm

    Can you show explain/show how to connect the 8620W controller to the aprilaire 1820?

  2. John dickey on October 16, 2019 at 6:27 pm

    My question is my Aprilaire has two ten foot 8” flex ducts I also have a fan blowing out the foundation in one spot rest are sealed how far away Should the return or supply air be also which one is best to be on the same side as fan

    • Michael Church on October 17, 2019 at 9:53 am

      Hello John. I would have the return near the fan this way the dry air is less likely to go out the fan. If your crawl space is large you can put the ducts as far from each other as will reach but the Aprilaire is designed to be real efficient without them.

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