Crawl spaces are typically 1-3 feet high, which makes them a dark breeding ground for bacteria and fungi.

Here is a list of dehumidifiers that we have tested. Our research includes running the unit in the Crawl Space for 120 Hours.

Based on our testing and research we think these are the best rated crawl space dehumidifiers available in the market.

Top Rated Under House Dehumidifier

Dehumidifier	Name	Highlights
CHECK PRICE	Best overall value AlorAir LGR Compact	Color: Blue & Gray Weight: 75 lbs Coverage: 2,300 sq.ft Capacity: 190 pints/day Price: $1099 Warranty: 5-year
CHECK PRICE	Runner Up Aprilaire 1830 Pro	Color: Gray Weight: 67 lbs Coverage: 3,800 sq.ft Capacity: 70 pints/day Price: $1027.94 Warranty: 5-year
CHECK PRICE	Best Performance Dri-Eaz	Color: Blue & Gray Weight: 65 lbs Coverage: 7,000 sq.ft Capacity: 136 pints/day Price: $1930 Warranty: Lifetime
CHECK PRICE	Also Good XPOWER XD-75LH	Color: Blue & Black Weight: 104.4 lbs Coverage: 4,000 sq.ft Capacity: 105 pints/day Price: $1278 Warranty: 1-year
CHECK PRICE	Best Budget MOUNTO Roto-Mold	Color: Red, Grey and Black Weight: 78 lbs Coverage: 2,300 sq.ft Capacity: 85 pints/day Price: $959 Warranty: 5-year

Pros

Cons

Construction and Design

The AlorAir LGR Compact Dehumidifier is a blue and gray device. Its reasonable size makes it sufficiently compact to fit in tight spaces while also being easy to store. Rubber strips seal around the circuit board, which serves the all-important purpose of keeping moisture at bay.
Since it’s waterproof, this device is a suitable choice for flooded areas. It also boasts an epoxy-coated coils mechanism that ensures its enhanced durability.

Power and Dehumidification Capacity

The AlorAir LGR Dehumidifier is very efficient when it comes to expedient dehumidification of extra humid areas measuring up to 2,300 sq. ft. Its powerful motor utilizes only 5.4 amps on a volt of 115v power supply for energy efficiency.
Its outlet airflow of 210 CFM/350 CMH also shows its energy proficiency. This dehumidifier removes 190 pints of moisture in a day. It also comes with a condensate pump and hosepipe that allows an easy disposal.

Setup and Usability

Before running this compact dehumidifier, ensure that it’s several inches away from the wall for optimum performance. This unit comes with an easy to use interface; desired humidity levels can be easily set through a digital humidistat control. It also features a timer with which duration can be set for the dehumidification process. For drainage, the supplied hose pipe can be connected to the dehumidifier for easy disposal of the condensate into a sink or floor drain. Its large 10.625-gallon water tank eliminates the need to drain the condensate frequently. Its innovative defrosting system makes its performance remarkably well in chilly areas.

Size and Portability

This unit easy to carry around. The fact that it’s stackable makes it easy for you to store, particularly if your storage space is limited. Transporting this dehumidifier to various destinations is a breeze; users can easily stack several dehumidifiers on top of each other to save space.

Cleaning and Maintenance

The unit comes with a 5-year warranty, however, users need to take proactive steps towards keeping the machine running appropriately. Always inspect the condenser coils for frost or ice build-up. This inspection is especially important when operating under extremely low temperatures. Also, change the air filters regularly to keep the air in the crawl areas fresh.

Pros

Cons

Construction and Design

The Aprilaire 1830 Dehumidifier features basement-style corrosion-resistant aluminum coils and waterproof material, which allows it to stand the test of time despite the extreme conditions. This gray, box-like unit is comprised of robust steel material and features a gray shade. This unit is convenient to use as it offers automatic dehumidification. With its compact dimensions, this dehumidifier is perfect for small areas like bathrooms and crawl spaces.

Power and Dehumidification Capacity

The Aprilaire 1830 Dehumidifier is capable of removing 70 pints of water from your indoor environment per day. You will love this dehumidifier if your basement is a wet mess; it’s capable of extracting gallons of moisture without breaking a sweat.
The dehumidifier will work well in temperatures ranging from 50 to 104 degrees.

Setup and Usability

The unit conveniently comes with an easy to use interactive display. You can mount the control panel on the top or the side of the dehumidifier for easy access. With this automatic dehumidifier, you don’t have to deal with messy trays. All you have to do is connect the unit to a hose or place it over a drain to empty the saturated water. Ensure to keep it at the required level, then plug it to your power source, and you are good to go.

Size and Portability

The Aprilaire 1830 Dehumidifier is as compact and stackable for storage as it comes. Its durable packaging material keeps it safe while in transit, making it secure to transport. This unit is perfect for small homes, condominiums, townhouses basements, or seal crawl spaces. With this device, users can extract large volumes of moisture per day using very little power.

Cleaning and Maintenance

This unit’s cost of maintenance is incredibly low as most of its operations are automated. However, regular cleaning of the air intake and exhaust grills is recommended to maintain fresh air consistently in your home.
Your crawl area can dampen, making the air in there stale and repelling, which is where cleaning of the unit’s air filter comes in handy. Replace the air filter annually. The manufacturer will take care of any repairs if the warranty is still intact.

Pros

Cons

Construction and Design

The Dri-Eaz Revolution LGR Dehumidifier is comprised of rotomolded polyethylene material that renders it reliable and long-lasting. Its excellent combination of gray and blue hues makes it attractive to the eye, enough to be placed in the living room. It’s effortless for users to move the dehumidifier to the crawl space when they require to extract moisture.

Power and Dehumidification Capacity

Keeping vast or extra-humid tight spaces dry is easiest with Dri-Eaz Revolution LGR Dehumidifier. Its compact size, coupled with large 80-pint dehumidification capacity per day makes it perfect for crawl areas with high moisture content. This unit is capable of operating within temperatures max to 100 degrees;

• It also comes with a built-in humidistat that allows you to set your desired level of indoor moisture for customized dehumidification.
• The unit will automatically restart following a power outage, which facilitates continuous operation.

Setup and Usability

The Dri-Eaz Revolution LGR Dehumidifier has a Touch-pad control panel that indicates inlet and outlet temperatures in real-time. Users can set ideal temperatures for optimal moisture removal.

• It has an automatic pump-out system that gets rid of excess water via the hose attached to the dehumidifier, which can easily discharge condensate into an elevated level like a sink or toilet.
• It also comes with a built-in humidistat that automatically regulates your indoor moisture within your desired level.

Size and Portability

With a modest 7000 sq. ft. dehumidification capacity, it’s incredibly compact and easy to transport. It can be easily stacked for storage or when transporting it to a flooded area.

Cleaning and Maintenance

Ensure to give the unit at least 10 minutes before restarting it after the duration of the operation. This waiting time allows for sufficient cooling, preventing short-circuiting the compressor. Also, keep your water collection tank clean by emptying and scrubbing it regularly.
This unit boasts a durable, waterproof construction that makes it an excellent choice for combating moisture in flooded areas, which might otherwise suffer water damage.

Pros

Cons

Construction and Design

Despite its impressive capacity to extract massive amounts of moisture from indoor air, the BlueDri BD-BD-130-BL Industrial Commercial Dehumidifier Designed to withstand the rigors of the toughest spaces, the BD-130Pcan go into construction zones and buildings damaged by flooding and other water accidents.

Power and Dehumidification Capacity

The BlueDri BD-BD-130-BL Industrial Commercial Dehumidifier  comes with a powerful 7.5 Amp motor capable of operating comfortably in temperatures ranging from 33 to 100 Fahrenheit. It is also energy efficient and uses less power compared to other dehumidifiers in its class, making it ideal for dehumidifying large moisture-laden areas.

Setup and Usability

This dehumidifier comes with an easy to use control panel that allows you to customize the settings to your preference. A digital electronic display is tasked with monitoring your indoor humidity and recording the operating time.
It has a 38-foot drainage hose that purges when the water tank gets full, so it doesn’t require a watchful eye operation nor emptying the condensate manually. Although, make sure that the hose is connected correctly to prevent leakages.

Size and Portability

The BlueDri BD-BD-130-BL Industrial Commercial Dehumidifier  is a high performance industrial dehumidifier which makes it ideal for use in large areas other than crawl spaces. Users can quickly transfer it from one room to the other thanks to its lightweight design and wheels attachment. Also, users don’t have to use a lot of energy when moving it; its handle fits your hand like a glove, making it easy to pull across a room.

Cleaning and Maintenance

You need to inspect the unit regularly to ensure that it’s operating optimally. For instance, ensure to check the status of the humidistat to confirm that it doesn’t have excess moisture. If you are having a problem verifying the moisture level, a hygrometer will give you accurate readings. Clean the air filters and water tank regularly to maintain a consistent circulation of clean air in your crawl area.

Pros

Cons

Construction and Design

The ALORAIR LGR 85 Pint Commercial Dehumidifier features compact dimensions while weighing a meager 78 pounds, making it ideal for use in small spaces like kitchens or hallways as well. Its stackable design allows transport of its multiple units effortlessly to flooded areas requiring emergency dehumidification.
With an attractive combination of Red,Grey and Black colors, this unit is among the few commercial-grade dehumidifiers that aren’t an eyesore.

Power and Dehumidification Capacity

This unit is capable of expediently removing tons of moisture from areas like kitchen, basement, or crawl spaces as it has 190-pints dehumidification capacity. Unlike other high-performance units that are often bulky and heavy, this unit comes in a compact size that allows it to fit snugly in small spaces. Its powerful motor gives it the power to remove more moisture than dehumidifiers that are three times its size.

Setup and Usability

The ALORAIR LGR 85 Pint Commercial Dehumidifier essentially features an easy to use digital display setup. Since you can see the inlet and outlet temperature as well as relative humidity from the display, it’s easy to keep a tab on home or job site conditions and monitor the dehumidification progress.
When it comes to drainage, you can connect an external hose to drain the water outside or to a floor drain. The built-in condensate pump comes in handy when looking to discharge the condensate up a sink or toilet.

Size and Portability

Getting this powerful and easy to use dehumidifier will guarantee clean, fresh air in your house and crawl areas due to its compact size. This unit fits nicely in confined areas thanks to the horizontal orientation to its design. With a meager weight of 78 pounds, this dehumidifier is also easy to move from one room to another.

Cleaning and Maintenance

Replacing air filters is very crucial in the maintenance of ALORAIR LGR 85 Pint Commercial Dehumidifier. The filters are tasked with trapping dust and other harmful particles like fungi pores. Cleaning the sieves allows the dehumidifier to run efficiently and also ensures you have better indoor air quality in your home.

All these dehumidifiers are sufficiently compact to fit into constricted spaces while also being powerful enough to combat moisture issues in crawlspaces and basements.
Mold and bacteria in crawl spaces are ultimately dispersed throughout your home, causing health issues like allergies and respiratory problems.
It, therefore, helps to utilize an effective dehumidifier to keep humidity issues in check, which, fortunately, is possible using one of the compact and powerful units discussed above.