During specific seasons, the moisture in the most common areas of your home like the bathroom and living room is substantial enough to inflict problems. Crawl spaces are another thing. In this type of area, moisture is commonly great which is why typical and small models of dehumidifiers are not enough. That said, you need a more specialized kind of dehumidifier fit for such a situation: crawl space dehumidifiers.

Why are Crawl Space Dehumidifiers Important?

A crawl space dehumidifier is a very practical appliance that can effectively control the level of moisture in crawl spaces. This is important as moisture in these tight areas that goes uncontrolled could spread around your living space and could create bigger damages than you could expect.

It helps in the maintenance and prevention of damages to your properties. It translates to your defense against musty odors, mildew outbreaks, electrical damages, and the rotting of wood. Furthermore, too much humidity can cause sagging floorboards and peeling paints which, apparently, affects your home’s overall aesthetic and structural integrity.

According to Compact Appliance Channel, humidity contributes to the growth of airborne allergens like mold spores. With this, uncontrolled and excessive humidity can worsen the overall air quality in your homes resulting to asthma and other health issues.

Humidity contributes to the growth of airborne allergens like mold spores. With this, uncontrolled and excessive humidity can worsen the overall air quality in your homes resulting to asthma and other health issues.

Compact Appliance Channel

Insect and other forms of pest infestation in crawl spaces can also be prevented with the right dehumidifier. Keep in mind that high moisture attracts insects and rodents. It helps them strive and survive. Hence, where there is excessive moisture, there is a possibility of pest habitation.

What Makes a Perfect Crawl Space Humidifier?

As said, humidity in crawl spaces is relatively higher than normal. This is due to the fact that these places are often subject to water infiltration. With this, it should at least have the capacity of at least 50 pints to survive a day’s work inside a 2000 square feet area. Having a greater capacity, of course, is better. However, you should consider the size and shape of the unit to allow it to fit the tight space. In this case, a horizontal-shaped dehumidifier is more ideal.

There are other attributes to look for in a crawl space dehumidifier. Convenience is one of the major items on the list. Since it will be placed in such an area that is hard to reach, it is better to have the features that will allow better control of the unit. This includes auto-defrost, humidistat setting, continuous drainage option, hygrometer, condensate pump, and automatic shut-off.

5 Best Crawl Space Dehumidifier

After securing the important features mentioned above, it is now time to find a reliable model and brand of dehumidifier. Some of them come from Dri-Eaz, AlorAir, and Aprilaire.

On the other hand, one model that greatly excels among other choices available is the Dri-Eaz F412 LGR 7000XLi. It boasts a handful of a great mixture of features that makes the unit truly superior compared to others. For instance, it comes with a 235-pint maximum saturation removal capacity each day. With this, the unit can cover at least 3,300 square feet of an area without struggles. The draw of the air is beyond the recommended amount and is very powerful at 325 CFM.

Nonetheless, if you want more options to explore, here are some of the models we’ve seen and tested for your assurance. Let us offer you the facts and essential insights you need by highlighting the best observations we have about each of them.

Best Crawl Space Dehumidifiers Comparison & Rating

Crawl Space Dehumidifiers

Features

Dri-Eaz-F412 LGR 7000XLi Commercial & Portable Dehumidifier with Pump - Up to 111 L water removal per day,Blue
  • HygroTrac Remote Monitoring System
  • can cover at least 3,300 square feet
  • draws 8.3 amps on a 115 V power supply
ALORAIR Basement/Crawlspace Dehumidifiers 198 PPD (Saturation), 90 Pints (AHAM), 5 Years Warranty, Condensate Pump, Auto Defrosting, Rare Earth Alloy Tube Evaporator, Remote Control (optional)
  • 2.69 L/kWh
  • 2,600 square feet of space
  • 198-pint saturation and a 90-pint AHAM capacity
ALORAIR Commercial Water Damage Restoration Dehumidifier 85 Pint Flood Repair
  • 2.44 L/kWh, 5.62 amps, rated power 640 W
  • 2,300 square feet of space
  • 180 PPD capacity at saturation condition and 85 PPD capacity at AHAM
Dri-Eaz 1200 Commercial Dehumidifier with Pump, Industrial, Durable, Compact, Portable, Blue, F203-A, Up to 18 Gallon Water Removal per Day
  • 145 pints per day at saturation and 64 pints per day under AHAM
  • 227 CFM capacity that can handle up to 2,000 square feet of space and above
  • draws 6.4 amps on a 115 V power supply
Aprilaire - 1830Z 1830 Pro Dehumidifier, 70 Pint Commercial Dehumidifier for Crawl Spaces, Basements, Whole Homes up to 3,800 sq. ft.
  • 160 CFM and can cover 3800 square feet
  • 70 pints of moisture from the air per day
  • compatible with 110V AC to 120V AC single phase 60 Hz power sources

1. Dri-Eaz F412 LGR 7000XLi Dehumidifier

Dri-Eaz-F412 LGR 7000XLi Commercial & Portable Dehumidifier with Pump - Up to 111 L water removal per day,Blue
Specifications:
99% Overall

CFM

325 CFM

Dimensions

20” x 20” x 33.5”

Weight

107 pounds

Capacity

235 PPD (saturation); 130 PPD (AHAM)

99%
performance
99%
durability & quality
99%
features
98%
ease of use & convenience
Pros:
  • Supports 4 languages: Spanish, German, French, and English.
  • The build of the unit’s polyethylene housing is sturdy and solid.
  • Comes with a handle and wheels for easy transport.
  • Has a temperature operating range of 33° F to 100° F.
  • Offers an onboard humidistat and digital control panel.
  • Performs automatic pump-out and automatic restart after power outages.
  • Comes with a pump basin for holding condensate that sealed to help prevent spills.
  • Utilizes a 3M HAF filter.
  • Only produces 60 dB noise.
Cons:
  • The HygroTrac Remote Monitoring System is sold separately.
  • Too big for crawl spaces with limited vertical spaces.
Final Take:

Dri-Eaz brand is one of the widely recognized names when it comes to dehumidifiers. One of the things the brand boasts is its advanced crossflow technology which ensures the maximum performance of each unit’s air processing abilities. The F412 LGR 7000XLi is one of the models that sport it, allowing it to have a 235-pint maximum saturation removal capacity each day.

This low-grain refrigerant dehumidifier is armed with a self-monitoring system that uses built-in sensors. This plays an important role that as it will adjust the speed of the fan automatically, depending on the condition.

It also has the essential features you need so you can be sure that it will work efficiently without the need to monitor it. With this, regardless of how long you want the unit to run, you can be sure that there is almost no chance for a problem to arise. It boasts an auto-defrost and a pump feature (uses a 40-foot hose). The maximum lift water height of the unit is at least 20’ which is beyond the ideal 15’ ability of most models.

It also uses a 25-foot power cord which is enough to reach the power outlets. The ‘Command Hub,’ on the other hand, is pure genius. It allows great versatility, control, and monitoring such as inlet and outlet temperature status, relative humidity, job hours. It even allows the setup of the humidistat, maintenance prompts, and more! What’s even better is that you can access all of them wirelessly using the HygroTrac Remote Monitoring System. This means convenience for you.

Though we really love this model from Dri-Eaz, there is one gripe we can’t ignore: the shape. This might be a problem for some people as most crawl spaces have limited vertical spaces. This is the reason why most models come horizontally. Nonetheless, if you are one of those folks who don’t have such a kind of crawl space, it won’t be a problem. It measures 20” L x 20” W x 33.5” H so it should fit a space with a considerable height measurement.

If its height still suits your needs, this can be a powerful crawl space dehumidifier. It has 325 CFM and with that, it can cover at least 3,300 square feet easily. If you have such kind of crawl space at home. This is ideal for you. When we tested it, the result was satisfying. Its effect took longer than we expected but it is acceptable given that the area was more than its indicated capacity. Nevertheless, it didn’t take an entire day to stabilize the humidity of the area. Very ideal for wide crawl spaces. So, yes, it is still an absolute champ on the list!

2. AlorAir Sentinel HDi90 Dehumidifier

ALORAIR Basement/Crawlspace Dehumidifiers 198 PPD (Saturation), 90 Pints (AHAM), 5 Years Warranty, Condensate Pump, Auto Defrosting, Rare Earth Alloy Tube Evaporator, Remote Control (optional)
Specifications:
98% Overall

CFM

210 CFM

Dimensions

23.2” x 15.2” x 17.7”

Weight

85.9 pounds

Capacity

198 PPD (saturation); 90 PPD (AHAM)

98%
performance
98%
durability & quality
99%
features
98%
ease of use & convenience
Pros:
  • Sports a rare earth alloy tube evaporator to extend the life of the coils.
  • Compliant with the electrical safety ETL.
  • Has a memory restart feature.
  • Comes at 58 dB.
  • Has a functioning temperature range of 33.8 to 104 ℉.
  • Uses a washable MERV-1 filter.
Cons:
  • The optional remote control is sold separately.
Final Take:

ALORAIR is another remarkable brand of a dehumidifier. Its model, the Sentinel HDi90, has a 198-pint saturation and a 90-pint AHAM capacity. It has dimensions of 23.2” x 15.2” x 17.7”. The right size to fit in narrow spaces. Nonetheless, despite its size, it is equipped with a great set of features that makes it work efficiently 24/7.

Just like the Dri-Eaz F412 LGR 7000XLi, it comes with an auto-defrosting feature and condensate pump (max lift of 5 meters). Some of the significant characteristics of heavy-duty dehumidifiers. That said, it can continuously manage and monitor and control the humidity of up to 2,600 square feet of space.

Moreover, at 210 CFM, despite being a compact unit, it can manage humidity levels within 12 hours of activation. The model also doesn’t have a problem with the frosting. The sensitivity of the auto-defrost is great. As soon as frost starts and is detected on the coils, the defrost cycle will start. 

To make things even more favorable for you, the model offers an optional remote. Though it is just optional, it is very pleasing to know that it is designed with such a sophisticated function as this. Having it would give you complete control over the unit anytime. No more frequent checking. No hassle.

3. AlorAir Storm LGR Extreme Dehumidifier

ALORAIR Commercial Water Damage Restoration Dehumidifier 85 Pint Flood Repair
Specifications:
97% Overall

CFM

210 CFM

Dimensions

22.8" x 13.7" x 17.3"

Weight

70.5 pounds

Capacity

180 PPD (saturation); 85 PPD (AHAM)

96%
performance
97%
durability & quality
96%
features
97%
ease of use & convenience
Pros:
  • Has an operating temperature range of 33 to 105 ℉.
  • Armed with an auto-defrosting capability.
  • Also features a memory restart ability.
  • The operation is very intuitive.
  • Displays temperature and humidity at both inlet and outlet.
  • The condensate pump is very efficient.
  • Compact but very powerful.
  • Can effectively work non-stop.
  • The build of the case is ergonomic to allow solid grip while being transported.
  • Uses a MERV-8 filter.
  • Has a 19.6-foot cord and 19.6-foot long hose.
Cons:
  • The drain hose can be a bit short for some users.
Final Take:

Storm LGR is another dehumidifier from ALORAIR that is designed for medium-sized crawl spaces. With a 180 PPD capacity at saturation condition and 85 PPD capacity at AHAM, it can handle 2,300 square feet of space.

Just like its sibling, the Sentinel HDi90, it has a compact build measuring 22.8 x 13.7 x 17.3 inches. Really perfect for incredibly tight crawl spaces and basements. Despite that fact, the commercial unit has great consistency at 210 CFM using its continuous operation mode. Its performance really satisfying that within 12 hours of activation, it can clean musty odors caused by excessive moisture. Even when used to an area with a partition, its draw is really powerful. Under the specified space range, it managed to lower humidity levels from 68 to 55 percent humidity when we tested it. At 36 hours, it had collected at least 8 gallons of water.

Designed with a rare earth alloy tube evaporator like Sentinel HDi90, you can be sure that it can maintain the coil’s heat transferability. This gives the coil a tougher quality, allowing it to last years.

It also sports a digital humidistat control, timer, and condensate pump: things that make it very convenient. Just plug it and do the necessary settings you deem perfect and you let do its thing in the crawl space. Once the humidity above the target is sensed, it will automatically start dehumidification. Easy.

Now, here’s another great thing about it: durability. It has a waterproof design that allows it to tolerate the presence of water since the rubber strip makes the circuit board 100 percent sealed. With this, floods won’t be a problem at all. You can even use the unit right away on a damp basement, crawl space, and other surfaces!

4. Dri-Eaz F203-A 1200 Commercial Dehumidifier

Dri-Eaz 1200 Commercial Dehumidifier with Pump, Industrial, Durable, Compact, Portable, Blue, F203-A, Up to 18 Gallon Water Removal per Day
Specifications:
96% Overall

CFM

227 CFM

Dimensions

20" x 19.5" x 32"

Weight

80.0 pounds

Capacity

145 PPD (saturation); 64 PPD (AHAM)

95%
performance
98%
durability & quality
94%
features
96%
ease of use & convenience
Pros:
  • Comes in rugged rotomolded polyethylene housing.
  • Has electronic touch-pad controls.
  • Very easy to transport.
  • Comes with a 3M HAF filter.
  • Capable of great hose and cable management.
  • Features easy-to-read digital controls display.
  • Supports multiple languages: Spanish, German, French, and English.
  • Has an operating temperature range of 33 to 100 degrees F.
  • Comes with a 40’ hose and 25’ cord.
Cons:
  • Too big for crawl spaces with limited vertical spaces.
Final Take:

Dri-Eaz is known for its portability: trolley-like designs with a handle and a set of semi-pneumatic wheels for mobility. The 1200 model is another proof of it. 

Though it has a great resemblance to Dri-Eaz F412 LGR 7000XLi, it has half its capacity at 145 pints per day at saturation and 64 pints per day under AHAM. Nonetheless, this is powerful enough with the help of its 227 CFM capacity that can handle up to 2,000 square feet of space and above.

In spite of its size, it is very rich in essential details that enable it to perform its function the right away. One of them is the hot-gas bypass that makes the defrost system work faster compared to cheaper brands.

The condensate pump is also very effective. Never falters in expelling water. It can work 24/7 non-stop and can fill gallons after gallons each day. Under high humidity levels, we managed to collect 7 gallons of water just in one night. Imagine getting that outcome from a small dehumidifier model like this! The multiple operating modes are also very impressive given that is a lower variant or model of a dehumidifier. Very versatile for a lower price.

5. Aprilaire 1830 Pro Dehumidifier

Aprilaire - 1830Z 1830 Pro Dehumidifier, 70 Pint Commercial Dehumidifier for Crawl Spaces, Basements, Whole Homes up to 3,800 sq. ft.
Specifications:
94% Overall

CFM

160 CFM

Dimensions

14.5" x 33"

Weight

67 pounds

Capacity

70 PPD (AHAM)

93%
performance
97%
durability & quality
92%
features
95%
ease of use & convenience
Pros:
  • The control panel can be mounted on the top or front of the unit.
  • Features an interactive display.
  • Comes with duct collars.
  • Only comes at 54 dB.
  • Features a digital control with remote capability.
  • Comes with a 10' clear drain line.
  • Great sensitivity in sensing the humidity levels.
  • Has washable filter element.
Cons:
  • The external/remote control device is sold separately.
Final Take:

Aprilaire 1830 Pro is another dehumidifier that will fit the tightest crawl spaces. With a height of 14.5 inches and a length of 33 inches, setting it up to your desired area won’t cause any problem. Moreover, despite its compact size, it offers 160 CFM and can cover 3800 square feet of space. Even at a 10’ distance, you can feel the flow of the air it draws that is slightly warm. 

It will not disappoint you as well when it comes to durability. Featuring corrosion-resistant aluminum coils, the unit can work with efficiency and consistency all day long. When it is used to complement the recommended area capacity and right conditions, it can produce 2 pints per hour. Also, it deals with the presence of unfavorable odor perfectly. Clear results within the first 3 to 4 hours.

It also offers easy removal of moisture. With its set-it-and-forget-it nature, you can just set your target humidity and after that, it will automatically monitor the humidity levels and dehumidify the area. Nonetheless, do mind the level of the unit to assure the effective flow of the liquid to the drain.

Best Crawl Space Dehumidifiers - Buyer's Guide

capacity and area size

The capacity of the dehumidifier is the first thing that should be considered when buying one. Normally, small dehumidifiers with a 27-pint capacity per day can cover a maximum of 2,000 square feet. However, given the nature of crawl spaces as wide areas that commonly experience severe humid levels, it is advised to get a model with great capacity such as the Dri-Eaz F412 LGR 7000XLi which can produce 235-pint maximum saturation removal capacity each day. Nonetheless, it is better if you know the overall size of your crawl space area and finds the unit that exactly suits it. Thankfully, there are units that are equipped with automatic sensing that will just automatically maintain the humidity level once they have achieved it.

drain

Besides the length of the hose, it is also important to consider how the dehumidifier disposes of water. There are dehumidifiers that use buckets but given the demands in crawl spaces, such a kind of unit is not really ideal as it would mean frequent cleanup and manual removal of liquids. With this, it is better to choose the units that use either a leveling system or a condensate pump system. The latter, apparently, costs more. nonetheless, it can remove water regardless of its position and it would mean great convenience for you.

controls

Crawl space dehumidifiers are meant to be a set-and-forget appliance at home. Nonetheless, it would be better if it also offers remote capabilities that will allow you to control it without the need to crawl back again in the tight spaces where it is situated. There are models like the Dri-Eaz F412 LGR 7000XLi and the AlorAir Sentinel HDi90 that offer this feature.

temperature and operation

Always check the temperature operation of the machine to determine how far it can tolerate harsh conditions like winter. Also, it is better if the dehumidifier has its own auto-defrost system like the AlorAir Storm LGR Extreme, AlorAir Sentinel HDi90, and the Dri-Eaz F412 LGR 7000XLi. With this feature, you can be sure that the unit can perform effectively even in the most extreme conditions, and most of all it can serve as great protection for the dehumidifier translating to the longevity of the product itself.

Best Crawl Space Dehumidifiers - FAQs

Can I use a basement dehumidifier in a crawl space?

Yes, you can use a basement dehumidifier in a crawl space. However, make sure that it has the right capacity for the area and the body dimensions to fit tight spaces. This is why crawl space dehumidifier units have broader shapes instead of being tall forms. One good example is the AlorAir Sentinel HDi90 with the dimensions of 23.2” x 15.2” x 17.7”.

What is the ideal humidity level for a crawl space?

Around 30% to 60% is the magical humidity level you need for scrawl spaces. However, it is important to note that the ideal maintenance level is 55% in order to achieve healthy and quality air status.

How much noise does a crawl space dehumidifier make?

The noise levels crawl space dehumidifiers make are usually rated 55 to 60 dB. It can be compared to the natural volume of an individual talking. However, there are some instances that it can be louder. One factor contributing to this is the vibration caused by loose screws.

Is a crawl space dehumidifier necessary?

Yes, a crawl space dehumidifier necessary. It can prevent the occurrence of a musty odor and the growth of molds. Also, it can help in the health of your home’s structure by preventing too much humidity that can damage wood and other materials.

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Author

Jimmy Black started his career as a construction and carpenter foreman. After years of hard work, he decided to go on his own. Now, Jimmy is one of the trusted experts at SolidSmack who knows at first glance whether your hammer would do a great job or not. He still involves himself in various construction projects and works for individual clients. Behind formalities, he enjoys being a father to two lovely kids who keep on asking him why they can’t quit school and travel the world like Dora The Explorer.