Aprilaire 1820 Dehumidifier Review

This is a review of the Aprilaire 1820 Dehumidifier. If you’re looking for a dehumidifier for your crawl space, then keep reading to decide if this is the right one for you.

The Aprilaire 1820 is one of the best mid-sized dehumidifiers for residential and commercial use. It is a top choice dehumidifier for the crawl space or for whole-home dehumidification. Aprilaire is a Wisconsin-based manufacturer of indoor air quality solutions including dehumidifiers, humidifiers, and air purifiers. The Aprilaire 1820 is the smallest unit the company offers from its 1800 series of whole-home dehumidifiers.

Like other Aprilaire products, the 1820 gets mostly positive reviews from multiple online retail stores I found. If you’re interested, below we’ll discuss the important features of the 1820 and what customers think of this dehumidifier.

Aprilaire 1820 Crawl Space Dehumidifier
Aprilaire 1820 Crawl Space Dehumidifier
Moisture Removal 70 pints (9 gallons) per day
Coverage2,800 sq. ft.
Airflow200 CFM
Current Draw5.8 Amps
Dimensions12.5 x 12.5 x 25 inches
Weight56 lbs.

Check the price here.

• Powerful moisture removal
• High energy efficiency
• Continuous drainage
• Made in the USA
• Built to last
• With five-year warranty
• High noise level
• No built-in condensate pump

Aprilaire 1820 Dehumidifier Review

Aprilaire Crawl Space Dehumidifier Performance

The Department of Energy determines dehumidifier performance ratings by testing these two measures: its moisture removal capacity and energy efficiency.

Moisture Removal Capacity

Although very rarely visited, the crawl space is just as important as any part of the house. Keeping your crawl space moisture-free ensures healthy humidity throughout your home. A dehumidifier helps prevent mold, termites, and structural wood rot. It is a necessary addition to your Heating, Ventilation, and Air Conditioning (HVAC). Aprilaire offers compact yet powerful dehumidifiers for the crawl space and whole house, ranging from 70 to 130 pints in capacity.

The Aprilaire 1820 is just the perfect size for the average home’s sealed crawl space or basement with moderate to high humidity in certain months. It removes 9 gallons or 70 pints of water per day at the average conditions of 80°F and 60% relative humidity, as dictated by the Association of Home Appliance Manufacturers (AHAM). It has an airflow rate of 200 cubic feet per minute (CFM) and covers an area of up to 2,800 square feet. The unit may also be ducted to your HVAC system for whole-home application or other large, enclosed spaces like warehouses.

Energy Efficiency

With a rated current draw of 5.8 Amps, the 1820 is an energy efficient whole-home dehumidifier. Although a lot of Aprilaire dehumidifiers are Energy Star certified, this particular model is not. Even so, it consumes a maximum of 700 Watts on operation, around the same as running some Energy Star rated portable dehumidifiers. Considering the capacity and coverage, you will definitely save a considerable sum on operating costs with the 1820.

Noise Level

The noise usually isn’t a cause for concern in crawl space dehumidifiers, but it can still be disturbing if the unit is installed right below a living or sleeping area. The Aprilaire 1820 is on the louder side even for a crawl space dehumidifier, so it might be a good idea to consult an expert for the proper way and best location for installation.

Key Features and Functionality

A single purchase of the 1820 dehumidifier also includes the following components: an Aprilaire 5695 filter, two duct collars for the inlet and outlet, nine #10 ½ screws, a Torx bit, a drain adapter, and a 10-feet long ¾” drain tube for the continuous draining feature.

Aprilaire 1820 Dehumidifier included in the box

Digital Controls

Aprilaire 1820 Dehumidifier digital control

This 70-pint dehumidifier has a built-in control panel that can be mounted on the front of the unit. It features four simple buttons and a digital display that shows the humidity and current working status. Set your desired humidity level from 40% to 80% RH using the up and down arrow buttons. The dehumidifier will sample the air every hour and if the current humidity is higher than the setting, it will start dehumidifying until the relative humidity is 3% below your target.


Like most other dehumidifiers of its capacity, the Aprilaire 1820 continuously drains the condensate through gravity. Simply attach the included drain adapter and hose to the outlet port on the side of the unit. Level the dehumidifier above the drain for a mess-free automatic drainage. 

Aprilaire’s crawl space and whole-home dehumidifiers do not come with a built-in condensate pump, which limits your drainage options. However, if you really need the drain pump functionality, I recommend looking for an external condensate pump. Attach it to the drain port and the collected condensate will be pumped out automatically up to a specified height or directed to your sump pump. 

Build Quality

The 1820 dehumidifier was designed and manufactured in the U.S. by the Aprilaire brand headquartered in Madison, Wisconsin. Specially designed for crawl spaces, this unit is both powerful and low maintenance.  Aprilaire dehumidifiers are built to last long with corrosion-resistant aluminum coils surrounded with the metal panel exterior. They are products of quality manufacturing processes and guaranteed with a five-year warranty for your peace of mind.

Consumer Feedback

The Aprilaire 1820 is fairly low maintenance. There are no messy trays that need to be emptied, it just needs a simple filter cleaning or replacement once per year. It’s important to use the right type of filter from Aprilaire to ensure proper functioning. For larger crawl spaces or whole-home applications up to 7,200 square feet, consider the Aprilaire 1850 or 1870 models. Watch this video for more information on Aprilaire whole-house dehumidifiers.

A lot of the reviews for the 1820 mention the dehumidifier’s powerful moisture removal. One user notes that humidity went from 70% to around 40% and the musty odors disappeared within days after installing. Some have reported that humidity went from 70–80% down to 40–50% in less than 24 hours. Of course, the actual performance will vary depending on the size of your space and the level of dampness.

One common complaint about this model is the high noise levels during operation. If you’re installing in the crawl space, one user suggests not to hang the unit from floor joists as the vibrating sounds will resonate throughout your home. A number of users note that they can feel the vibrations in the floor even from a room away. To avoid this, you can set up the dehumidifier on the ground with adjustable risers to keep the unit level.

In any case, your best option is to consult with an HVAC expert to install your unit properly. Your dehumidifier is only as effective as how well you maintain it. Like any appliance, it’s important to keep the unit clean and get it tuned up at least every year. Your dehumidifier should last at least five years.
Overall, the Aprilaire 1820 is a powerful and efficient dehumidifier for the crawl space. It may be priced a little higher than the closest competitors, but coming from a trusted brand, it’s guaranteed to perform excellently and last long. For reference, see more customer reviews here or read more about Aprilaire dehumidifiers here.

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