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11 Best Rated Dehumidifiers for Crawl Space – In-Depth Reviews

I s your crawlspace lacking ventilation or the measures you have set in place are inefficient, which ultimately leads to condensation forming? Beware that this issue needs immediate tending as mold and mildew can appear in this space. There is the issue of the hot and humid air affecting the environment indoors too.

In warm climate areas, it is all the more imperious to handle this issue as chances are higher for moisture to form. Dehumidifiers remove excess moistness to normalize indoor humidity levels. However, for this specific area, you must use a crawlspace dehumidifier as its profile, and superior moisture draw abilities enable it to solve the problem.

Do you have a damp basement that you need dehumidification in? Then make sure that you don’t leave until you check out the best dehumidifiers that are suited for use in the basement and any other normal-sized area or room in your home.

Top 11 Crawl Space Dehumidifiers Compared

Photo Product Design Water Extraction Area Coverage Lowest Operating Temperature Energy Factor Warranty Price

Best Overall
1. Dri-Eaz F413 Revolution Size: 21.5” x 17.6” x 12.5”
Weight: 65 lbs.
135 PPD 7,000 sq. ft. 33°F 2.21 L/kWh Housing: Lifetime
Coil and compressor: 6 years
Parts and labor: 1 year
Check Price at Amazon

Best with Pump
2. Mounto MT 80 Size: 21” x 16” x 13”
Weight: 70 lbs.
80 PPD (125 PPD at maximum saturation) 7,000 sq. ft. 40°F N/A Parts and labor: 1 year Check Price at Amazon

Editor’s Choice
3. Aprilaire 1850F Size: 27.5” x 14.5” x 12.5”
Weight: 70 lbs.
95 PPD 3,000 sq. ft. 50°F 1.88 L/kWh Parts and labor: 5 years Check Price at Amazon
4. AlorAir Sentinel HDi90 Size: 23.2” x 15.2” x 17.7”
Weight: 78.3 lbs.
198 PPD 2,600 sq. ft. 33.8°F 2.88 L/kWh Parts and labor: 5 years Check Price at Amazon
5. BaseAire AirWerx90X Size: 23.2” x 15.2” x 17.7”
Weight: 81 lbs.
90 PPD (198 PPD at maximum saturation) 2,600 sq. ft. 33.8°F 2.88 L/kWh Compressor, evaporator, and condenser: 5 years
Parts and labor: 1 year
Check Price at Amazon

Best for the Money
6. AlorAir Storm LGR Extreme 85 PPD Size: 22.8” x 13.7” x 17.3”
Weight: 78 lbs.
85 PPD (190 PPD at maximum saturation) 2,300 sq. ft. 35.6°F 3 L/kWh Compressor: 5 years
Parts and labor: 1 year
Check Price at Amazon
7. Dri-Eaz F515 PHD 200 Size: 21.5” x 17.6” x 12.5″
Weight: 63.2 lbs.
75 PPD (135 PPD at maximum saturation) 1,000 sq. ft. 45°F N/A Housing: Lifetime
Coil and compressor: 6 years
Parts and labor: 1 year
Check Price at Amazon

Best with Humidistat
8. Santa Fe Compact70 Size: 21” x 12” x 12”
Weight: 55 lbs.
70 PPD 2,600 sq. ft. 49°F 2.4 L/kWh Parts and labor: 6 years Check Price at Amazon
9. Seaira Watchdog NXT85C Size: 21.7” x 12” x 12”
Weight: 60 lbs.
85 PPD (160 PPD at maximum saturation) 15,000 cu. ft. 33°F 2.71 L/kWh Parts and labor: 5 years Check Price at Amazon
10. XPower XD-75LH Size: 13.1” x 29.2” x 22.2”
Weight: 66.1 lbs.
74 PPD (135 PPD at maximum saturation) 1,500 sq. ft. 33°F N/A Parts and labor: 1 year Check Price at Amazon
11. Ebac CD30E Size: 22” x 14” x 12”
Weight: 55 lbs.
17 PPD 400 sq. ft. 33°F N/A Compressor, evaporator, and condenser: 3 years
Parts and labor: 1 year
Check Price at Amazon

If you don’t have dampness issues in your whole home but rather only the bathroom, then look into a dehumidifier for bathroom that has the appropriate area coverage and moisture removal capability necessary to deal with this specific area of the house.

1. Dri-Eaz F413 Revolution

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  • Coverage: 7,000 sq. ft.
  • Moisture extraction: 135 PPD
  • Air movement: 180 CFM
  • Lowest operating temperature: 33°F
  • Cord length: 25’
  • Drain hose length: 40’
  • Housing material: Polyethylene
  • Noise level: 60 dB
  • Energy factor: 2.21 L/kWh
  • Dimensions: 21.5” x 17.6” x 12.5”
  • Weight: 65 lbs.
  • Warranty: Housing – lifetime; Compressor and coils – 6 years; Parts and labor – 1 year

Gone are the days of bulky dehumidifiers as higher efficiency and more compact units like the Revolution keep popping out. It is rated to remove upward to 80 PPD when the environmental temperature is 80°F and dampness is 60%. In saturation circumstances, it can draw 139 pints from the air over 24 hours. Moreover, it processes up to 180 cubic feet of air per minute, so you can trustfully depend on it to solve indoor humidity problems.

It allows full adjustability of its operation so that you receive the expected results. One of its greatest highlights stands in the opportunity to set the moistness level you want to uphold in the crawlway with the help of the humidistat. If humidity levels are worryingly high, you can opt to run it continuously.

In terms of coverage, it exceeds the industry standard as it can work in areas of up to 7,000 square feet. It can endure temperatures as low as 33°F without the coils freezing up. The recessed feet ensure easy and convenient transportation. It features an electronic control panel that shows relative humidity, temperature, and keeps track of operating hours.

Q: What humidity level can I set for it?
A: You can program this setting in 5% increments as low as 40% or as high as 90%.

  • Since it removes an estimated 17 gallons of moisture per day, it fares well in water saturated areas
  • Continues the drying process even after a power outage due to the automatic restart
  • Perfect for restoration tasks since it works well in dry low-temperature environments
  • The recessed feet indents let you stack up to 3 Revolution units on top of each other



With a space-saving design that disproves only bulky dehumidifiers can handle restoration jobs, this Dri-Eaz product professionally handles any task moisture removal job you throw its way since it is rated at 139 PPD in near saturated conditions. Hard to beat when it comes to reducing humidity, it was bound to be our top recommendation, especially if you consider the heavy-duty build that makes it withstand the harsh conditions in the crawlway just fine.

When moisture levels are abnormally high and the area that requires coverage is large too, a commercial dehumidifier is the right option to go for. These heavy-duty units are suited for harsher environments in terms of temperature as well, which is why they’re the go-to for commercial and industrial applications, as implied by the name.

2. Mounto MT 80

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  • Coverage: 7,000 sq. ft.
  • Moisture extraction: 125 PPD
  • Air movement: N/A
  • Lowest operating temperature: 40°F
  • Cord length: N/A
  • Internal pump:
  • Housing material: Polyethylene
  • Noise level: ≈70 dB
  • Energy factor: N/A
  • Dimensions: 21” x 16” x 13”
  • Weight: 70 lbs.
  • Warranty: 1 year

The MT 80 performs well in up to 7,000 square feet, and when used in saturation conditions, it can draw up to 125 PPD. Under normal circumstances, it removes 80 PPD, so irrespective of the environmental conditions it is confronted with, it is sure to excel in adapting humidity levels.

It is not a feature-rich model, which is a downside, but it is more affordable than dehumidifiers that boast similar specs and capabilities, which evens out this flaw. The numeric LCD shows moisture and temperature, while the button controls make it straightforward to set your favored settings. The stackable design is a plus seeing how it permits you to place up to 3 units on top of each other.

It features a cord holder where you can neatly place the long cord. Lastly, we cover the design aspect and mention that the housing is rotomolded, ensuring a durable, lasting build. The unit measures 21 inches D by 16 inches H by 13 inches W to fit in the crawlway just right, and it weighs only 70 pounds to make relocation easy.

Q: What dehumidification system does it use?
A: It utilizes compressor refrigeration.

  • Larger area coverage as opposed to most dehumidifiers in its class – up to 7,000 square feet
  • On the display, it shows the humidity level and inlet/outlet temperatures
  • The two carrying handles makes it easy to relocate the unit whenever needed
  • The built-in pump ensures that it can automatically drain the water so that you won’t have to empty any containers like you do with regular room dehumidifiers

  • You need to reset it after every power outage
  • Instructions manual is not included with the package


While not the most modern entry in our top, this isn’t to say that the lack of a few features takes from the product’s overall quality. If you consider that it dehumidifies areas up to 7,000 square feet in size and can wick up to 125 pints of moisture per day, it’s easy to understand why the fact that it doesn’t automatically restart after a power outage isn’t a flaw worth stopping you from acquiring and using it.

One operation that you must follow through with is crawlspace encapsulation to ensure that the air from this area won’t enter the living quarters, potentially affecting indoor air quality.

3. Aprilaire 1850F

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  • Coverage: 3,000 sq. ft.
  • Moisture extraction: 95 PPD
  • Air movement: 245 CFM
  • Lowest operating temperature: 50°F
  • Cord length: 6’
  • Drain hose length: 5’
  • Housing material: Metal
  • Noise level: 54 dB
  • Energy factor: 1.88 L/kWh
  • Dimensions: 27.5” x 14.5” x 12.5”
  • Weight: 70 lbs.
  • Warranty: 5 years

With numerous convenience features that add to the delight of using it under its belt, the Aprilaire 1850F is one of the most versatile entries in the niche. It comprises a MERV-8 filter that helps remove dust specks and allergens from the air, creating a safer habitat. When it comes to its purpose, as it can remove up to 95 PPD without flinching, and due to the 3,000 square feet area coverage, it is guaranteed to handle any environment you position it in.

It features a thawing function that automatically activates in dangerously cold conditions to keep the compressor safe from damage. As it can work in areas where the relative moisture spans from 0 to 100% and the temperature ranges from 50°F to 104°F, you can even utilize it in the basement.

For convenience in transportation and relocation, it comes with lifting handles and easy-roll locking wheels. The manual control dial it integrates permits you to toggle between humidity levels with ease so that you may create the ideal ambiance for you. Besides, it is one of the quietest units out there, the maximum sound level reached being only 54 decibels.

Q: How do I clean the filter?
A: Turn off the dehumidifier, remove the access door to the filter and take it out, after which you can proceed to clean it with warm water and a detergent solution. Before you place the filter back inside, make sure it is dry.

  • The automatic defrost function makes it suited for use in cold areas
  • Produces a small amount of noise considering its heavy-duty performance – rated at 54 dB
  • Adjustable outlet options – pick whether the moisture should discharge from the top or side
  • Digital control panel with top and front mounting options lets you set the unit up as you find it most convenient

  • It’s a heavy unit, so you must set it up on sturdy studs
  • If you don’t have a professional install it, the warranty is cancelled


Among the most energy-efficient models available despite the fact that it’s a heavy-duty dehumidifier on which you can rely to perform optimally even in saturation conditions, the 1850F from Aprilaire is a customer-favorite for obvious reasons. Best of all, it’s quiet, easy to use, and doesn’t require much upkeep, so it’s one of the most convenient options yet.

4. AlorAir Sentinel HDi90

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  • Coverage: 2,600 sq. ft.
  • Moisture extraction: 198 pints per day
  • Air movement: 210 CFM
  • Lowest operating temperature: 33.8°F
  • Cord length: 18’
  • Drain hose length: 16.4’
  • Housing material: Metal
  • Noise level: 55 dB
  • Energy factor: 2.88 L/kWh
  • Dimensions: 23.2” x 15.2” x 17.7”
  • Weight: 78.3 lbs.
  • Warranty: 5 years

For alarmingly high dampness, the proper way to bring it down and ensure a mold-free living space is to utilize the AlorAir HDi90 as it brings an unparalleled 198 PPD moisture extraction at maximum saturation. On average, it can remove up to 90 PPD when the temperature sits at 80F and the relative humidity at 60%.

It can cover up to 2600 square feet, providing excellent performance as long as relative humidity varies from 35 to 95% and the temperature spans from 33.8°F to 104°F. The low-temperature operation makes it usable in crawl spaces and cellars as ice is impeded from building up on the coils or compressor.

It features epoxy-coated coils that have a long lifespan, ensuring durability even in corrosive environments. It is Energy Star qualified, boasting an energy factor of 2.88 liters per kWh. The “hot gas” defrosting system provides proficient ice clearing. When it comes to backing, it is covered against faults for 5 years since the date of purchase.

Q: Does it come with a remote control?
A: No, it does not include one. However, you can acquire the remote controller separately if you want to benefit from a more convenient operation.

  • The automatic defrosting system makes it suited for environments where the temperature is as low as 33.8°F
  • The MERV-8 filter it is fitted with helps reduce unpleasant odors while the unit tackles moisture reduction
  • Among the quieter entries on the market – produces an estimated 55 dB when it runs
  • Since it automatically drains the water it collects, you won’t have to waste time emptying the reservoir

  • The drain hose tends to kink easily
  • Among the costlier models to run


AlorAir is already a resounding name when it comes to the production of dehumidification systems, yet none compare to the HDi90 from the Sentinel series since it can cover spaces as large as 2,600 square feet and can draw up to 198 PPD. It even fares well in low-temperature environments, so you don’t have to worry that it might damage during the colder months of the year.

5. BaseAire AirWerx90X

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  • Coverage: 2,600 sq. ft.
  • Moisture extraction: 198 PPD
  • Air movement: 210 CFM
  • Lowest operating temperature: 33.8°F
  • Cord length: N/A
  • Drain hose length: 19.6’
  • Housing material: Metal
  • Noise level: Less than 58 dB
  • Energy factor: 2.88 L/kWh
  • Dimensions: 23.2” x 15.2” x 17.7”
  • Weight: 81 lbs.
  • Warranty: Compressor, evaporator, condenser – 5 years; Parts and labor – 1 year

At saturation conditions, the AirWerx90X can accumulate up to 198 PPD, while under normal conditions, it draws approximately 90 PPD. To enjoy a peak performance on its part, utilize it in spaces of up to 2,600 square feet. To make matters as simple as possible, it integrates a condensate pump that enables continuous drainage. It features a 150-millimeter diameter air outlet that provides the focused dehumidifying you seek to restore dampness levels.

Convenience is key due to the control remote connection, permitting you to regulate its settings from anywhere. To guarantee a long lifespan, it integrates built-in overheating protection, and the coils are coated with stainless steel plate. The filter provides air purification to impede polluting particles from the air from damaging the unit’s internal parts. Its defrosting system makes it possible to run even when temperatures range from 33.8°F to 105°F as ice does not build up on the internal parts.

The auto-restart spares you from having to reinsert the preferred settings after a power outage as it picks up from where it left off. The touch control panel makes it user-friendly, while the display indicates inlet/outlet moisture and temperature to help you monitor environmental conditions, as well as the drying process. Moreover, BaseAire covers repair costs for the first 5 years after the purchase.

Q: Does it feature protective measures against damage?
A: To ensure that overheating never occurs, the BaseAire does indeed integrate built-in protection for this specific scenario.

  • Doesn’t have any trouble operating in low temperature environments – can withstand temperatures down to 33.8°F
  • The automatic humidistat detects when humidity levels change, starting the operation only when needed to uphold your chosen setting
  • Can be set to work until it reduces moisture down to 35%
  • Energy Star certified due to the energy-efficient operation it flaunts

  • You have to separately acquire the remote controller if you want to remotely control and monitor the unit
  • Weighs 78 pounds, so handling it during the setup process is a bit difficult


This BaseAire model really handles demanding jobs fine considering that it can remove up to 198 pints per day at saturation conditions, and it provides this impressive performance in spaces up to 2,600 square feet. The humidistat is automatic so that it upholds your selected humidity level constantly, and it doesn’t require much maintenance, which further adds to convenience in use.

6. AlorAir Storm LGR Extreme 85 PPD

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  • Coverage: 2,300 sq. ft.
  • Moisture extraction: 190 PPD
  • Air movement: 210 CFM
  • Lowest operating temperature: 35.6°F
  • Cord length: 19.6’
  • Drain hose length: 25’
  • Housing material: Polyethylene
  • Noise level: 58 dB
  • Energy factor: 3 L/kWh
  • Dimensions: 22.8” x 13.7” x 17.3”
  • Weight: 78 lbs.
  • Warranty: Compressor – 5 years; Parts and labor – 1 year

To benefit from optimal performance, use it in spaces that do not exceed 2,300 square feet. As it functions in temperatures from 33°F to 104°F and moistness ranging from 35% to 95%, it is perfect for crawlways. The thawing system clears any ice that might build up on the coils to protect inner parts from damage.

It makes less than 58 decibels, which is impressively quiet. A user-friendly design is guaranteed by the touch button control panel that indicates temperature and humidity. The built-in pump pushes moisture up to 20 feet high.

The MERV 8 filter clears the air of impurities so that environmental conditions improve as of utilizing it. The extra-long cord measures 19.6 feet, and there is even a storage space for it. Moreover, it is rated at 640W and comes with a built-in timer, both aspects making it an energy-efficient selection that is inexpensive to run.

Q: What can I use it for?
A: Removal of excess dampness, mold prevention, water damage restoration, damp basements and cellars, garages, storage areas.

  • MERV-8 filter keeps dust and other polluting particles from entering the unit and potentially damaging it
  • Upon the power returning after an outage, the memory start it features helps it automatically pick up from where it left off
  • Designed to work in area with airflow issues and low temperatures
  • Suited for a wide range of applications – crawlway and basement dehumidification, carpet and furniture drying, storage areas, laundries, garages, industrial institutions, and more

  • The user manual is poorly written and doesn’t contain important information regarding operation and upkeep
  • Does not feature caster wheels, which is a bit problematic considering how heavy it is


Manufactured by a leading brand in the business, the Storm LGR Extreme can remove as much as 190 pints per day in saturation conditions, which is sufficient for any residential or industrial application you have in mind. Since it even works in low temperature conditions without a problem, reducing humidity issues in the crawlway year-round won’t pose any sort of issue for it.

7. Dri-Eaz F515 PHD 200

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  • Coverage: 1000 sq. ft.
  • Moisture extraction: 135 PPD
  • Air movement: 180 CFM
  • Lowest operating temperature: 45°F
  • Cord length: 6’
  • Drain hose length: 20’
  • Housing material: Polyethylene
  • Noise level: 60 dB
  • Energy factor: N/A
  • Dimensions: 21.5” x 17.6” x 12.5″
  • Weight: 63.2 lbs.
  • Warranty: Housing – lifetime; Compressor and coil – 6 years; Parts and labor – 1 year

The F515 measures 12.5 inches by 17.6 inches by 21.5 inches, this compact size making it simple to install, maneuver, and ensuring maximum space efficiency. It weighs only 63.2 pounds, so you won’t need a second person when handling it. Furthermore, impact-resistant rotomolded housing ensures durability over time.


Its maximum water extraction capability reaches 135 PPD, so irrespective of how high humidity gets, using it is a surefire method to fix the problem. However, this is the optimal performance we are talking about, on average, when the temperature sits at 80F and relative humidity at 60%, it collects up to 75 PPD. What also makes a positive difference is the 1,000 square foot coverage that suffices for most crawlways.

  • Automatic pump-out: Allows continuous operation as draining is not required on your part. Instead, draining occurs automatically as moisture is collected.
  • Digital touch-pad controls: Provide an intuitive utilization of the unit. Four different language options are at your disposal, and the unit indicates temperature and RH in real-time.
  • Auto-restart: After a power outage, it will retake its operation with the previously selected settings.
  • Automatic defrost: Usable in chilly spaces as frosting is prevented from forming on the coils.
#1 – It does not operate:
Cause Solution
It is not turned on Turn it on.
It does not receive power Plug it in and check the power cord connection at the outlet and the base of the unit.
#2 – Room is not dry:
Cause Solution
Insufficient drying time Allow the unit more time to operate.
Poor air circulation Use air movers to increase air circulation.
Excessive moisture infiltration Prevent infiltration by sealing off the area.
#3 – Collects a small amount of water:
Cause Solution
Clogged filter Check filter and clean or replace it as necessary.
Clogged coils Check coils and clean them as necessary.
Low temperature indoors Increase room temperature as levels have gone below what the unit can handle.
#4 – Water drips when moving it:
Cause Solution
It was unplugged before it finished purging Wait until the defrost cycle finishes before you unplug it.

A lifetime assurance is offered for the casing, 6 years guarantee for the coils and compressor, and a 1-year warranty for parts and labor. On top of that, as Dri-Eaz is one of the major manufacturers out there, folks working at client support are true professionals who treat their clients respectfully and promptly fix any issues involved with the products sold by the company.

Q: What type of applications is it appropriate for?
A: Due to the generous coverage, ability to tackle severe excess dampness, and high moisture draw, the F515 is suitable for residential, industrial, and commercial applications.

  • The on-board self-diagnostic system constantly checks for issues with the unit’s operation while the dehumidifier runs
  • The auto defrost function makes it work even in environments where the temperature is down to 45 degrees Fahrenheit
  • The electronic control panel shows RH, inlet/outlet temperatures, and job and life hours
  • Mesh particle filter dust and particles so that they won’t enter the inside of the unit and potentially damage it

  • Only dehumidifies down to 40%, which could be problematic for some users
  • Tends to be a bit noisy, so it’s best not to set it up directly under the bedroom or home office


Suited for spaces of up to 1,000 square feet and able to remove up to 135 pints per day in saturation conditions, this Dri-Eaz entry really gives you a run for your money. It might have a few limitations that could pose an issue, like the fact that it doesn’t reduce humidity below the 40% threshold, but if this isn’t an issue for you, it’s an option worth considering to resolve moisture problems in the crawlway or basement.

8. Santa Fe Compact70

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  • Coverage: 2,600 sq. ft.
  • Moisture extraction: 70 PPD
  • Air movement: 150 CFM
  • Lowest operating temperature: 49°F
  • Cord length: 9’
  • Drain hose length: 8’
  • Housing material: Metal
  • Noise level: 55 dB
  • Energy factor: 2.4 L/kWh
  • Dimensions: 21” x 12” x 12”
  • Weight: 55 lbs.
  • Warranty: 6 years

Even though it measures only 12 inches by 12 inches by 12 inches, it provides powerful dehumidification. Under normal conditions, it extracts up to 70 PPD from the air. To make sure it offers peak performance, utilize it in spaces of up to 2,600 square feet.

It comes with a gravity drain hose that allows continuous use as the collected moisture is automatically eliminated. The fans it features can run continuously or only when it dehumidifies, so you can improve air circulation if you utilize it for water damage restoration. It comes with a washable pre-filter and a MERV-13 filter that trap impurities from the air to help impede the air pollutants from damaging the unit and create an overall healthier habitat.

As it produces 55 decibels tops when it runs, it won’t present a nuisance. The automatic defrost function permits it to run in temperatures as low as 49°F without ice building up on the internal parts.

It automatically resumes with your pre-selected settings after a power outage. Its built-in humidistat regulates the output to uphold the humidity level you select. Moreover, Santa Fe backs it against defects for 6 years after you purchase the product.

Q: Does there exist the option to suspend it between floor joists?
A: If you want to get it out of the way through this type of mounting, it is possible, but only with the separate acquisition of the hanging kit for the system.

  • The automatic defrost function keeps the coils from having ice form on them when the environmental temperature starts to lower
  • Its size permits it to fit between floor joists, which allows you to opt for hanging installation
  • Features a MERV-13 filter that effectively traps impurities lingering in the air so that they won’t enter the unit and potentially damage it
  • You have the option to move the exhaust outlet and opt for either horizontal or vertical discharge

  • If dampness conditions are worryingly high, expect the unit to run almost unremittingly to reduce moistness to a safe level
  • Other models can work in temperatures significantly lower than the Santa Fe


Powerful yet space-saving, this Santa Fe model is ideal for crawl spaces with a low height above the ground and tight basements. It removes up to 70 PPD, ensuring that excess dampness won’t be an issue for long after you start running it, and you can count on it for areas measuring up to 2,600 square feet.

9. Seaira Watchdog NXT85C

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  • Coverage: 15,000 cu. ft.
  • Moisture extraction: 160 PPD
  • Air movement: 185 CFM
  • Lowest operating temperature: 33°F
  • Cord length: 10’
  • Drain hose length: 20’
  • Housing material: Metal
  • Noise level: 59 dB
  • Energy factor: 2.71 L/kWh
  • Dimensions: 21.7” x 12” x 12”
  • Weight: 60 lbs.
  • Warranty: 5 years

Able to operate in a wide range of temperatures due to the hot gas auto defrost (withstands temperatures as low as 33 degrees Fahrenheit without the internal coils having frost build up on them), this unit that is specially built for use is the crawl space is an option worth looking into considering its long-run reliability and the fair asking price.

It is intended for spaces up to 15,000 cubic feet in size, and you can depend on it to remove an estimated 85 pints of moisture per day under normal conditions and a peak 160 PPD at maximum saturation. It features an internal condensate pump with a 15-foot lift. The digital touch pad grants an intuitive means to set the desired humidity level for the unit to uphold. It features a washable pre-filter and you can choose between a MERV, HEPA, or carbon filter as an extra. The filters help by trapping polluting particles from the air entering the unit to ensure that these won’t produce any damage to the internal parts.

It produces less than 60 dB when it runs, so chances are that even if you have a bedroom above the precise area in the crawlway where you set it up, you won’t hear the dehumidifier running when you try to sleep. It measures only 21.7 inches by 12 inches by 12 inches, so no matter how obstructed the crawlway is, you won’t have trouble fitting it inside the tight space just fine. In terms of backing, expect the manufacturer to provide free support when repairs are needed for the first 5 years after you purchase the product.

Q: Can I duct the unit?
A: Yes, you can duct the Seaira if you want to. In fact, the duct collar kit is available as a separate purchase since this is an optional setting. To duct the unit, you need a 10” collar kit for the supply duct and the return duct.

  • The hot gas defrost keeps frost from building up on the unit’s internal parts and potentially damaging them
  • Automatically restarts with the pre-selected settings after a power outage is over
  • Integrates a heavy-duty condensate pump with 15’ lift
  • Backed by a 5-year warranty against manufacturing defects

  • Ducting kit is sold separately
  • Does not feature caster wheel, so relocating can get tiring


Specifically intended for the crawlspace, the NXT85C is an option you ought to consider if the space you will use it for doesn’t exceed 15,000 cubic feet. You can count on it to withdraw up to 160 PPD at maximum saturation and an estimated 85 PPD under normal conditions. Moreover, it uses filters to trap impurities from the air entering the unit to protect it from potential damage.

10. XPower XD-75LH

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  • Coverage: 1,500 sq. ft.
  • Moisture extraction: 135 PPD
  • Air movement: 170 CFM
  • Lowest operating temperature: 33°F
  • Cord length: 25’
  • Drain hose length: 40’
  • Housing material: Polyethylene
  • Noise level: N/A
  • Energy factor: N/A
  • Dimensions: 13.1” x 29.2” x 22.2”
  • Weight: 66.1 lbs.
  • Warranty: 1 year

Energy Star licensed for its efficient performance and the Eco-friendly design it boasts, the XPower XD-75HL is a must-have when dealing with excessively damp crawlways or basements and even for water damage restoration projects. As it stacks up to 3 units high, irrespective of how much damage a flood did, you will get rid of the issue in no time.

It can remove up to 74 PPD and is appropriate for large spaces, not dropping in performance. It comes with an automatic purge pump with a 40-foot long drainage hose that allows automatic elimination of the water when the XD-75LH is full, thus excluding the need for your interference for manual purging.

The dual intake technology boosts its efficiency and performance, and it can even handle running in low temperatures – functioning temperature range spans from 33 to 105 degrees Fahrenheit. There are 2 speed settings to pick between, and it even provides automatic speed control so that your preferred humidity level is met and kept without you having to set it manually.

One of its neatest features is the electronic display that monitors moisture levels to keep you aware of environmental conditions. It also records the XPower’s operating time. As the casing is tough ABS, you can utilize it in the most unfavorable conditions without worrying about damage as the internal parts are protected.

It is easily transportable since it weighs only 66.1 pounds and features front and rear handle grip points. When it comes to warranty, XPower has it covered on parts and labor for 1 year after the purchase.

Q: What is the length of the power cord?
A: The power cord measures 25 feet, so chances are that you won’t need extension cords irrespective of how vast the space you use it in is.

  • In regular circumstances, it removes up to 74 PPD, while in saturation conditions it goes as high as 135 PPD
  • Energy Star certified for its significantly more energy-efficient operation as opposed to similar models in terms of performance
  • Peak airflow capacity of 180 cubic feet per minute
  • Comes with a 25-foot long power cord and a 40-foot long drain hose

  • Doesn’t flaunt the best area coverage – only 1,500 sq. ft., less than other models in its price range
  • Tends to be a bit noisy, so it’s best that you don’t set it up directly under the bedroom


It might not be the quietest model out there but it does a more than decent job when it comes to moisture reduction, and that’s all that counts. If the crawlway or general space where you want to use it doesn’t exceed 1,500 square feet in size and you consider that its capability of removing 135 PPD in saturation conditions suffices to solve your excess humidity issues, then you ought to consider this reliable product.

11. Ebac CD30E

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  • Coverage: 400 sq. ft.
  • Moisture extraction: 17 PPD
  • Air movement: 170 CFM
  • Lowest operating temperature: 33°F
  • Cord length: 27’
  • Drain hose length: 9.8’
  • Housing material: Steel with epoxy coating
  • Noise level: 47 dB
  • Energy factor: N/A
  • Dimensions: 22” x 14” x 12”
  • Weight: 55 lbs.
  • Warranty: Compressor, evaporators, condenser – 3 years; Parts and labor – 1 year

If the previously reviewed products deliver a higher moisture removal performance than you need, the Ebac CD30E is your optimal choice. It can remove up to 17 PPD, and it covers spaces of up to 400 square feet. It comes at a much more reasonable price than the models which outrank it, so it is a more budget-smart alternative. The drain hose it comes with measures 9.8 feet in length. It can work in temperatures spanning from 33°F to 95°F.

A feature that helps keep ice from forming on the internal parts is the “hot gas” defrost that automatically thaws away frost as it starts building. Just as convenient is the automatic restart that guarantees the operation will resume from where it left off after blackouts.

As it makes a peak operating noise of only 47 decibels, you won’t even notice that it is turned on. Additionally, it is backed with a 1-year guarantee on parts and labor, while the condenser, compressor, and evaporator are covered for 3 years.

Q: Can I set the humidity level that it should maintain?
A: Yes, with the help of the variable humidistat you can choose the dryness level that it should maintain.

  • Makes only 47 dB when it runs – quiet enough so that you can install underneath the bedroom without worrying it might pose a distraction during sleep hours
  • Enters the automatic defrost mode when frost starts to build up on the internal parts
  • Automatically turns off when your selected humidity level is reached to save on running costs
  • The heavy-duty steel chassis and epoxy coating finish protect the unit’s exterior from the elements

  • Since the gravity drain is placed at the bottom, you must elevate the unit to drain the water
  • It does not feature caster wheels, which makes carrying it a bit inconvenient


If the area you need the unit to draw moisture from doesn’t exceed 400 square feet in size, then you must consider the CD30E since it is efficient for a space of this size and doesn’t cost much either. It’s a value deal for people who aren’t dealing with extreme dampness in their crawl spaces or basements, one that is guaranteed to deliver the promised results.

High Moisture Causes and Effects

High Humidity Sources

Vented or not, there is one thing all crawlways have in common, which is surplus moisture problems. But why is this a common issue, and why are southern areas affected by it? To understand how humidity builds up underneath the house, you must acknowledge the sources that cause it.


Soil iconSoil:

One of the most common sources of excess moisture is uncovered soil. If there are no vapor barriers put down on the ground, the soil continuously vaporizes water into the crawlway, causing excessive dampness in the air.



Plumbing leak iconPlumbing leaks:

A lot of plumbing pipes, whether it is drain lines or supply lines, actually run through the crawlways, which means that when a leak occurs in the pipes, this space gets filled with water that inevitably evaporates and turns into humidity. Seeing how you rarely visit this area, chances are for leaks to go on for weeks, even months before they are discovered.



Wall iconFoundation walls:

As few people damp-proof the outside of the house, moisture migrates through the foundation of the walls. Thus, whenever it rains or if the ground is moist because of environmental conditions, the dampness will likely infiltrate through the walls, causing excess humidity.



Vent iconFoundation vents:

The idea behind vents might be to dry out the crawlway, but this causes the exact opposite, especially in summer as the outdoor air, which is high in moisture, gets through the vents and raises the relative humidity in the crawlway.


High Humidity Health Risks

How internal temperature regulation works:
Naturally, when the human body starts to heat up, sweat is released and often evaporated from the skin, helping us cool off in return. When environmental conditions do not meet expectations and moisture is high, the sweat does not evaporate, remaining in the body feeling sticky and hot. This causes the body to work even harder to cool off, which results in excessive sweating, heavy breathing, and an increased heart rate. As you sweat excessively, a considerable loss of water and chemicals occurs, which causes the body to cease functioning properly.

High Humidity Influence on the Structural Integrity of the House

Aside from threatening your health directly, unchecked moisture levels can affect the structural integrity of your home as well. Often overlooked and not on the top of the homeowner’s priority list, the crawlway accumulates dangerously high moisture quicker than you would expect. Those living in generally humid areas have to look out for this as mold infiltrations occur when humidity is left unmonitored. Otherwise, they risk investing a lot more cash in repairs than they would have paid on a simple specialty dehumidification device.



As humidity in the crawlway rises, it can build up in the walls, causing them to become soggy. Over time, this leads to a decrease in structural safety, existing the potential risk of aggressive cracking, and even complete wall destruction at a slight impulse. Besides expending a moisture removal device, we recommend you increase wall insulation to enhance the building’s resistance.



When mold and mildew get into wood flooring, they are extremely hard to get rid of and can cause permanent destruction that asks for a replacement. If mold has made its way into your flooring, we advise that you utilize a tri-sodium phosphate solution, thoroughly rinse it, and let the floor dry out on its own.


Mechanical systems:

High humidity goes hand in hand with condensation, and if you let moistness levels go haywire, condensation can build up on water pipes, which will ultimately cause them to rust and burst. This will imply huge repair costs and significant damage to the house structure, so you should try and avoid the occurrence altogether through any means necessary.



Just as flooring, wood furniture is highly vulnerable to condensation and mold/mildew infiltration. Woefully, furniture cannot always be saved if this issue emerges, so you must ponder the possibility of facing costly redecorations if you do not take proper safety measures and take care of your home as a whole.

Buying Guide

Whether you are a seasoned user of dehumidification units or a first-time buyer, you need some guidelines to help you decide what product to opt for. In the following, we will help you figure out what you ought to look into when you make the acquisition by showing you what aspects we mainly took into consideration when rating the products we picked for this article. This way, you won’t only be informed regarding what aspects matter when you buy a crawlspace dehumidifier, but you will better understand why we picked these specific models and ranked them the way we did.

Moisture removal capacity

Your main interest with a crawlspace dehumidifier is for the unit to eliminate as much moisture as possible in record time, so the removal capacity of these units was our main rating criteria, models that wicked higher amounts over 24 hours receiving more points.

Maximum area coverage

Crawlways vary in size, but these are usually large spaces that have special requirements when it comes to the abilities of dehumidification systems. We gave higher ratings to models that can cover large areas as these can perform optimally irrespective of the square footage they must handle.

Automatic operation

This refers to the dehumidifier’s competence to uphold the humidity level you set without requiring your interference at any point. Just select a moisture level, and the unit will automatically upkeep it, running until it is reached and stopping when it meets requirements.

Auto-restart function

Power outages happen from time to time. When this happens, the automatic restart steps in to save the day and not have you manually restart the dehumidifier. Instead, the unit picks up from where it left off with the pre-selected settings.

Energy Star certification

This is the best pointer of energy efficiency, only machines that consume considerably less than similar models receiving this sought-after label.

Low-temperature operation

The crawlway is space-bound to face low temperatures, so these machines must provide the same operation even when it gets cold, all without having internal parts affected by the environmental conditions.


Simplicity in use is guaranteed only by intuitive controls. We pondered this aspect, rating user-friendly units better since you won’t have trouble operating them.


While this agreement is active, the unit is supposed to be replaced or repaired free of charge by the producing company, thus sparing you upkeep costs for that specific period.


The machine is supposed to go in the crawlway, which is a tight space. Thus, design matters, more compact units receiving higher scores as it is more likely for them to fit easily in the space beneath your house.

Frequently Asked Questions

How much does it cost to install a dehumidifier in a crawl space?
The average cost for a crawlspace dehumidifier is from $900 to $1800. This price fluctuates according to the product’s dehumidification capacity, area coverage, and more. If you want to make sure that the installation is properly followed through with, we advise that you call in an HVAC technician. This service will likely cost you another $500 to $600.

How long does it take to dehumidify this area of the house?
The first time you run the system, it can take an estimated 12 hours to run properly and reach the set humidity level. From that point on, the system will move more rapidly when it comes to lowering moisture levels.

Where should I place the dehumidifier?
As all crawlspace dehumidifiers require constant draining, either being equipped with a drain hose or featuring a built-in pump, you must make sure to position the unit so that it can drain with ease. Make sure the surface on which it stands is level and that there won’t be anything blocking the discharge airflow.

Should it run all the time?
No, it is not necessary to run the dehumidifier all the time. Doing so would cause the energy bill costs to rise, so you would spend considerably more money. You should set the system to run only when moistness levels surpass the comfort threshold – 50%. This way, you avoid overspending on the bills.

If moisture is high in the crawlspace, will it cause indoor humidity to rise as well?
On average, high humidity in this area causes indoor moistness levels to rise by an estimated 5-15%. However, with insulated crawlspaces, this matter is prevented from occurring.

Can I use it in another area of the house?
If you can properly set it up in the specific area you are referring to, yes, you can use it anywhere you want, a lot of folks switching between use in the crawl space and the cellar with these devices.

What is the optimal humidity level to uphold?
Just like in any other space, the ideal relative humidity to uphold in the crawlway should vary from 40 to 55 percent. Anything higher causes excess dampness and creates perfect growing grounds for mold and mildew.

Does it require cleaning/maintenance?
Models with replaceable or washable filters require that you occasionally tend to their filtration media. All models, however, require cleaning. Luckily, the procedure is simple as it solely requires you to vacuum the exhaust grills and air intake to get rid of dust and debris.

Is insulating the crawlspace worth it?
Yes, you should follow through with this procedure if you want to maintain energy efficiency in your home. Once you insulate the crawl space, heat and cool air won’t get lost through the floor as easily, so your HVAC systems won’t work as hard to preserve optimal temperature indoors. Moreover, air quality preservation is granted as pollutants won’t enter living quarters as much.


Naturally, you tend to be forgetful about the crawlway seeing how you don’t usually access it as you would the basement, for example. However, as you already understood by this point, upholding appropriate humidity levels in this area is just as important as it is in the rest of your home as it influences the habitable quarters of the house.

To put it in simpler words, if moisture is high in the area beneath your house, it will inevitably be high indoors as well. Furthermore, there is the matter of moisture rising and affecting the structural integrity of your home, which puts your safety in danger directly and could end up costing you a hearty sum of money on repairs.

Best Crawlspace Dehumidifier for Sale: Dri-Eaz F413 Revolution

There are no limitations to how you can use the F413 because it covers spaces as big as 7,000 square feet, tackling the issue of surplus moisture unlike any other dehumidifier as it can wick away from the air up to 80 PPD. Among the highlights that make it the best on the market are:

  • Real-time display of environmental conditions (temperature and dampness).
  • Capacity to run even in locations where the temperature is as low as 33 degrees Fahrenheit.
  • When the power comes back after a blackout, the unit retakes its operation from where it left off without requiring you to set the settings once again.

The heavy-duty F413 is built for the toughest of situations, its specialty being water damage restoration. A costly acquisition but one worth making to upkeep the structural integrity of a house, fit even for industrial or commercial applications, it was a no-brainer for the top spot.

Editor’s Choice: Aprilaire 1850F

What characterizes the 1850F, aside from the effective moisture removal it employs, is the convenience in use. Easy to move around, allowing the option to hang it if you have the gear for it, and self-protective to fend off damage in the sense that the thaw function activates to impede the compressor from freezing, it is the product that impressed us the most overall. Woefully, the lowest temperature threshold it can withstand is 50 degrees Fahrenheit, so it is not recommended for cold environments.

Best Crawlspace Dehumidifier for the Money: AlorAir Storm LGR Extreme 85 PPD

In saturation circumstances, it removes upwards to 190 PPD, which in combination with the affordable price it comes at as opposed to most products make it a value deal – a heavy-duty dehumidifier that comes at half the price other units do. It endures low operational conditions and stays relatively quiet when it runs. Moreover, it caters to large spaces of up to 2,300 square feet so that it works for residential and commercial use alike.

Best Crawlspace Dehumidifier with Pump: Mounto MT 80

The convenient operation guaranteed by the incorporated pump of the MT 80 isn’t the only highlight you benefit from as there are other perks to be had as well. High moisture removal is an obvious perk as the second spot entry rid the air of humidity quite effectively, as expected, being rated to wick up to 125 pints in saturation conditions. Moreover, it comes with intuitive touch controls and boasts a stackable design, it’s an option worth looking into.

Best Crawlspace Dehumidifier with Humidistat: Santa Fe Compact70

Feel free to set the humidity for the Santa Fe to maintain as you prefer as this unit features an intuitive humidistat. It works in unfriendly conditions as it automatically defrosts to prevent frost from affecting internal parts. It is a go-to for water damage restoration, permitting you to stack up to 3 of these dehumidifiers to amp performance. Likely the sole downside is that the power cord is only 9 feet long, which means that you are likely to need extension cords when setting it up.

Markus Mackay
Markus Mackay
Our resident expert in all things AC-related, Markus is a never-ending source of knowledge regarding how these systems work. What makes him so savvy in this field is his direct experience that he acquired while working in sales. The connections he made during that period also came in handy here as Markus knows a lot of experts in this field. With each article uploaded, he makes sure to gather the expertise of his more experienced ex-peers as well, making sure to provide readers with reliable reviews and articles.

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