11 Best Rated Dehumidifiers for Crawl Space – Protect the House Structure from the Effects of High Moisture

A reason for debate among homeowners has always been how to proceed with the crawl space. Should it be vented or not? Should it be encapsulated, or insulated? The end goal is the same, however, keping the crawlspace moist-free. According to the U.S. Department of Energy Building America program, unvented, conditioned crawlspaces are the solution. Venting might seem like a good idea at first since you are tempted to think that the moist air will be pushed outside. In reality, if you live in a humid climate, the outcome is that more moist air is pushed from the outside in the crawlspace.

Unvented crawlspaces that have been properly conditioned have other benefits too, namely:

• Energy consumption is reduced by approximately 18% in buildings with this sort of design (cooling and heating sources won’t consume as much);
• Humidity is reduced by an estimated 20% throughout the whole structure.

A moist crawlspace leads to a series of issues, not only for your health, especially if you suffer from respiratory issues since the appearance of mold will aggravate your condition, but to problems related to the building’s structural integrity. So risks are fairly abundant if you don’t handle the matter properly. Aside from properly sealing the crawlway, you must set in place measures to reduce humidity if it tends to be high and keep it in check regardless of how environmental conditions change with time.

Dehumidifiers are specially built to handle removing excess moisture from the spaces you set them up in. However, a classic-style dehumidifier won’t even fit in the crawl space, let alone handle the demanding task of reducing humidity in this generally extremely damp area. For this task, the only product you can count on is the crawl space dehumidifier. Its profile differs from that of a normal dehumidifier – it’s not as tall – and it can remove considerably higher amounts of moisture over 24 hours – some models even go as high as 190 pints per day.

To pick the right dehumidifier, you have to consider two aspects, namely area coverage and moisture extraction. Choose a model that can handle working in a space as large as your crawlway and that matches the performance you need when it comes to humidity reduction, and RH won’t go up in the crawl space ever again. As a result, the building’s structure won’t suffer, mold won’t form, and your health won’t suffer either.

To assist and guide you toward making the right decision, we have rounded up the best crawl space dehumidifiers, testing, reviewing, and rating them according to their capabilities. We will tackle the subject of crawl space encapsulation too, as well as dig a bit deeper into the issue of high moisture, what causes it, and how it affects both your health and the building’s structure. However, before we dive into the main topic, let’s first go over what makes a quality product so that you know what to look into when you make the acquisition.

Crawl Space Dehumidifier Buying Guide

Whether you are a seasoned user of dehumidifiers or a first-time buyer, you need some guidelines to help you decide what product to opt for. In the following, we will show you what aspects you must look into so that you get the right crawlspace dehumidifier for the size and conditions in your crawlway. So, follow our advice and you can say goodbye to any moisture-related issue in this specific area of the building.

• Moisture removal capacity: Your main interest with a crawlspace dehumidifier is for the unit to remove as much moisture as possible over 24 hours. This must be your main criteria when you go in for the acquisition. Crawl spaces are known to be extremely damp, so the higher the moisture removal capacity is, the better since it shows the dehumidifier won’t have trouble regulating RH levels.
• Area coverage: To figure out your best option from this point of view, you first have to measure and learn the size of your crawl space. Acquire a dehumidifier that matches it for optimal performance. Avoid going for a product that can cover a considerably larger area than that since it will only draw extra power uselessly.
• Automatic operation: For convenience in use and to make sure the dehumidifier won’t draw more power than necessary, go for a model that turns on and off automatically depending on moisture conditions. The unit should turn on when the humidity level exceeds your set threshold, and turn off when the RH level you picked is met.
• Automatic restart: Power outages happen from time to time. When they occur, the automatic restart function steps in to save the day and not have you manually reset 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 dehumidifiers that consume considerably less power than their counterparts receive this sought-after certification.
• Low-temperature operation: The crawl space is bound to face low temperatures, so the dehumidifier you choose must be able to run just as smoothly when the temperatures start to drop as it does under normal functioning conditions.

Now that you are well versed in the subject and you know how to make the right choice, we can continue with what interests us most: ranking, rating, and reviewing the best crawlway moisture removal units available. Let’s go!

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 pints per day	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 pints per day (125 pints per day at maximum saturation)	7,000 sq. ft.	40°F	N/A	Parts and labor: 1 year	Check Price at Amazon
Editor’s Choice	3. Ecor Pro EPD150-PRO	Size: 17.52” x 13.86” x 13.58” Weight: 38.58 lbs.	74 pints per day	2,000 sq. ft.	-4°F	L/kWh	Parts and labor: 1 year Desiccant wheel: 5 years
	4. BaseAire AirWerx90X	Size: 23.2” x 15.2” x 17.7” Weight: 81 lbs.	90 pints per day (198 pints per day 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 with Humidistat	5. Santa Fe Compact70	Size: 21” x 12” x 12” Weight: 55 lbs.	70 pints per day	2,600 sq. ft.	49°F	2.4 L/kWh	Parts and labor: 6 years	Check Price at Amazon
	6. Aprilaire 1850F	Size: 27.5” x 14.5” x 12.5” Weight: 70 lbs.	95 pints per day	3,000 sq. ft.	50°F	1.88 L/kWh	Parts and labor: 5 years	Check Price at Amazon
	7. AlorAir Sentinel HDi90	Size: 23.2” x 15.2” x 17.7” Weight: 78.3 lbs.	198 pints per day	2,600 sq. ft.	33.8°F	2.88 L/kWh	Parts and labor: 5 years	Check Price at Amazon
	8. XPower XD-75LH	Size: 13.1” x 29.2” x 22.2” Weight: 66.1 lbs.	74 pints per day (135 pints per day at maximum saturation)	1,500 sq. ft.	33°F	N/A	Parts and labor: 1 year	Check Price at Amazon
	9. Abestorm Guardian SN55	Size: 19.3” x 11.9” x 13.7” Weight: 57.3 lbs.	55 pints per day (120 pints per day at maximum saturation)	1,300 sq. ft.	33.8°F	1.9 L/kWh	Parts and labor: 5 years
	10. Seaira Watchdog NXT85C	Size: 21.7” x 12” x 12” Weight: 60 lbs.	85 pints per day (160 pints per day at maximum saturation)	15,000 cu. ft.	33°F	2.71 L/kWh	Parts and labor: 5 years	Check Price at Amazon
	11. Ebac CD30E	Size: 22” x 14” x 12” Weight: 55 lbs.	17 pints per day	400 sq. ft.	33°F	N/A	Compressor, evaporator, and condenser: 3 years Parts and labor: 1 year	Check Price at Amazon

1. Dri-Eaz F413 Revolution

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Summary: 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.

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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. If this area coverage vastly exceeds what you need, the company has you covered. The Dri-Eaz F515 PHD 200 is the dehumidifier that might be a better fit for you in this situation seeing how it is intended for spaces of up to 1,000 square feet.

The F413 Revolution 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 and temperature and keeps track of operating hours.

Troubleshooting

#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 the 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.

Performance Test Results

Dri-Eaz F413 Revolution Specifications Sheet
Area Coverage: 7,000 sq. ft.	Moisture Extraction Rate: 135 PPD
Air Movement: 180 CFM	Lowest Operating Temperature: 33°F
Cord Length: 25 feet	Drain Hose Length: 40 feet
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

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2. Mounto MT 80

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Summary: 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.

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Just like the top-rated Dri-Eaz F413 Revolution, our runner-up, the MT 80, performs well in up to 7,000 square feet. 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 to 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.

Mounto MT 80 Specifications Sheet
Area Coverage: 7,000 sq. ft.	Moisture Extraction Rate: 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

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3. Ecor Pro EPD150-PRO

Summary: The tough build and superior moisture removal of this desiccant dehumidifier give you a run for your money. At first glance, it might seem that it doesn’t draw as much moisture as some of our other picks do since it’s rated at 74 PPD, but it is actually equivalent to a 150-pint compressor dehumidifier if you were to use it under normal residential conditions. It might be a little up there in pricing, but considering the versatile installation, ease of use, and overall performance, it’s worth every cent.

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Compared to the rest of the crawlspace dehumidifiers we have reviewed and tested, including the top-of-the-line Dri-Eaz F413 Revolution, the Ecor Pro EPD150-PRO is superior in one aspect – the conditions it can handle. This is a desiccant dehumidifier, which makes it superior when running in cold temperatures as opposed to classic compressor dehumidifiers. In fact, you can confidently run it when temperatures range from -4 to 104 degrees Fahrenheit, an aspect that we tested and can affirm is real. This stainless steel build dehumidifier is IPX2 rated, so it doesn’t have an issue with a bit of water falling on it either.

It is intended for spaces of up to 2,000 square feet, and it’s rated to remove approximately 74 pints of moisture per day (it’s basically the equivalent of a 150 PPD compressor dehumidifier). It’s easy to set up since all you need to do is find the right spot for it and plug it in. What we like most, however, is that you can put it however you like. Either place it on its side, upside down, mount it to the wall or ceiling, or use it freestanding. If you want to duct it, you have the option of adding a 5-inch flex or hard ducting. It is fitted with triple safety sensors that keep it from ever overheating, so you can count on it being a long-lasting acquisition.

For added convenience, it automatically restarts after power outages with your pre-selected settings. So, you won’t find yourself going down to the crawlspace to reset it each time the power goes out and comes back. Another convenient aspect stands in the filter that is encased in a metal frame and that you simply shake to clean whenever it gets too filthy.

Since it doesn’t feature a compressor, it is as quiet as it gets when it runs, producing only 56 decibels. Of course, we cannot end without saying a word about the quality guarantee that accompanies it. The manufacturer backs the product against defects for 1 year on parts and labor, while the desiccant wheel is covered for a total of 5 years.

Ecor Pro EPD150-PRO Specifications Sheet
Area Coverage: 2,000 sq. ft.	Moisture Extraction Rate: 74 pints per day
Air Movement: 224 CFM	Lowest Operating Temperature: -4°F
Cord Length: 15 feet	Drain Hose Length:
Housing Material: Stainless steel	Noise Level: 56 dB
Energy Factor: N/A	Dimensions: 17.52” x 13.86” x 13.58”
Weight: 38.58 lbs.	Warranty: 1 year for parts and labor, 5 years for the desiccant wheel

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4. BaseAire AirWerx90X

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Summary: 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.

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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. It’s actually very similar to the AlorAir Sentinel HDi90, so if you want an alternative for it, this is your best option. 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.

BaseAire AirWerx90X Specifications Sheet
Area Coverage: 2,600 sq. ft.	Moisture Extraction Rate: 198 PPD
Air Movement: 210 CFM	Lowest Operating Temperature: 33.8°F
Cord Length: N/A	Drain Hose Length: 19.6 feet
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

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5. Santa Fe Compact70

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Summary: 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.

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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’s among the most energy-efficient dehumidifiers we reviewed, flaunting an energy factor of 2.4 L/kWh. The only two models that fare better than the Santa Fe Compact70 from this point of view are the Dri-Eaz F413 Revolution rated at 2.21 L/kWh, and the Aprilaire 1850F rated at 1.88 L/kWh.

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.

Santa Fe Compact70 Specifications Sheet
Area Coverage: 2,600 sq. ft.	Moisture Extraction Rate: 70 PPD
Air Movement: 150 CFM	Lowest Operating Temperature: 49°F
Cord Length: 9 feet	Drain Hose Length: 8 feet
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

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6. Aprilaire 1850F

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Summary: 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.

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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, 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, with the maximum sound level reached being only 54 decibels.

Aprilaire 1850F Specifications Sheet
Area Coverage: 3,000 sq. ft.	Moisture Extraction Rate: 95 PPD
Air Movement: 245 CFM	Lowest Operating Temperature: 50°F
Cord Length: 6 feet	Drain Hose Length: 5 feet
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

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7. AlorAir Sentinel HDi90

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Summary: 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.

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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%. A similar performance is granted by the AlorAir Storm LGR Extreme 85 PPD, the dehumidifier we previously ranked 9th in our top. We upgraded it for the HDi90 for its superior build and better moisture-wicking performance. However, both products are worth investing in.

Just like the Santa Fe Compact70 and the BaseAire AirWerx90X, 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.

AlorAir Sentinel HDi90 Specifications Sheet
Area Coverage: 2,600 sq. ft.	Moisture Extraction Rate: 198 pints per day
Air Movement: 210 CFM	Lowest Operating Temperature: 33.8°F
Cord Length: 18 feet	Drain Hose Length: 16.4 feet
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

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8. XPower XD-75LH

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Summary: 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.

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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. Where it doesn’t impress as much as some of its better-ranked counterparts, however, is area coverage. The XPower XD-75LH is suited for spaces of up to 1,500 square feet tops. Keep this in mind since it will underperform in larger areas. It does fare better than the Dri-Eaz F515 PHD 200 that only covers spaces of up to 1,000 square feet, or the Ebac CD30E that is suited for areas of up to 400 square feet. 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.

XPower XD-75LH Specifications Sheet
Area Coverage: 1,500 sq. ft.	Moisture Extraction Rate: 135 PPD
Air Movement: 170 CFM	Lowest Operating Temperature: 33°F
Cord Length: 25 feet	Drain Hose Length: 40 feet
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

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9. Abestorm Guardian SN55

Summary: Recommended for 1,300 square feet spaces thanks to its 55 pints per day moisture extraction, this Abestorm dehumidifier is a popular choice for the crawl space due to its performance, low operating noise, and compact design. Additionally, it doesn’t need much in the way of maintenance and comes at a reasonable price.

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If you’re looking for an accessible moisture management system for the crawl space when it comes to how much it costs, this Abestorm product might be the right option. Although it’s relatively cheap, at least when compared to some of its direct competition, it manages to preserve a substantial moisture-removing capacity of 55 PPD under normal operating conditions, and 120 PPD at saturation. This makes it suited for spaces of approximately 1,300 square feet, so if your crawlway isn’t larger than this, it’s an option worth considering.

It comes with basically all the standard features we have come to expect from crawl space moisture removal systems. It includes the Automatic Defrost that impedes ice from forming on the coils, which makes it suited for use in low-temperature environments. The lowest operating temperature that the Guardian SN55 can be subjected to is 33.8 degrees Fahrenheit. Thanks to the Memory Restart, it picks up where it left off after the power comes back after an outage. There’s no need for you to reinsert your chosen settings each time this happens as it retakes its normal operation without requiring any assistance.

The Guardian SN55 turns on and off automatically as needed to preserve optimal relative humidity levels since it’s an automatic operation model. It features a Rare Earth Alloy Tube Evaporator that, in combination with the internal corrosion protection, keeps Freon leakage from occurring while minimizing coil corrosion to expand the dehumidifier’s lifespan as much as possible. A 6.56-foot drain hose is provided with the package. Attach it to the unit so that the collected condensation passes through it and reaches the drain.

Since it produces less than 52 dB, you like won’t ever hear it run from the living room when you’re relaxing after a hard day of work. It features adjustable feet that allow you to level it to the surface it’s placed on to ensure optimal performance. If your budget allows it, we recommend that you also acquire the remote monitoring system so that you can keep an eye on the dehumidifier’s performance and change settings from a different area of the house. It features handles so that you may relocate it easily. When it comes to backing, the manufacturer covers it against defects for 5 years after you make the acquisition.

Abestorm Guardian SN55 Specifications Sheet
Area Coverage: 1,300 sq. ft.	Moisture Extraction Rate: 120 PPD
Air Movement: 130 CFM	Lowest Operating Temperature: 33.8°F
Cord Length: N/A	Drain Hose Length: 6.56 feet
Housing Material: Metal	Noise Level: 52 dB
Energy Factor: 1.9 L/kWh	Dimensions: 19.3” x 11.9” x 13.7”
Weight: 57.3 lbs.	Warranty: 5 years

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10. Seaira Watchdog NXT85C

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Summary: 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.

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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 on them), this unit that is specially built for use in 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 of 160 PPD at maximum saturation. It features an internal condensate pump with a 15-foot lift. The digital touchpad 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.

Seaira Watchdog NXT85C Specifications Sheet
Area Coverage: 15,000 cu. ft.	Moisture Extraction Rate: 160 PPD
Air Movement: 185 CFM	Lowest Operating Temperature: 33°F
Cord Length: 10 feet	Drain Hose Length: 20 feet
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

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11. Ebac CD30E

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Summary: 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 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.

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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 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.

Ebac CD30E Specifications Sheet
Area Coverage: 400 sq. ft.	Moisture Extraction Rate: 17 PPD
Air Movement: 170 CFM	Lowest Operating Temperature: 33°F
Cord Length: 27 feet	Drain Hose Length: 9.8 feet
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

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Alternative Crawlspace Dehumidifiers Worth Checking Out

As qualitative as our top picks are, you might not find exactly what you seek among them. But don’t fret, these aren’t our only recommendations. In this section, we want to briefly go over the alternative crawlway moisture-removing systems that you should look into before you decide. These systems are on par with our top picks in terms of performance but didn’t make it for brand repetitiveness considerations. Without further ado, here is what you need to know about the worthwhile alternatives to our main picks:

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High Moisture Causes and Effects

High moisture is a common issue for homeowners, and to understand how you can defeat it, you first have to acknowledge its causes and effects. Continue to read this section of our article and you will find all the information related to this topic to get better acquainted with the situation at hand and fully comprehend what’s at stake.

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:

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 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.

 

 

Foundation 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.

 

 

Foundation 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.

 

Walls:

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 using a moisture removal device, we recommend you increase wall insulation to enhance the building’s resistance.

 

Flooring:

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.

 

Furniture:

Just like 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.

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Is Encapsulating Your Crawl Space Worth It?

The crawl space is the foundation portion that supports the whole structure of a building, so it’s easy to understand why it’s essential to keep it in good shape. If excess moisture collects in the crawlway, mold growth is imminent. For individuals who suffer from asthma and allergies, this is extremely bad news since the presence of mold spores in the air aggravates their illness and triggers unwanted symptoms. There’s another issue with dampness in the crawlway, namely the fact that rust will form and the wood in the structure will rot, which threatens the integrity of the structure. To keep moisture-related issues in this area in check, one measure that you can take is to encapsulate the crawl space.

Question: What is crawl space encapsulation?

The procedure refers to adding a heavy-duty moisture barrier to the floor of the crawlway, sealing the vents in the foundation, insulating the walls, and setting up a dehumidifier to tackle removing moisture in this area. It’s the single best means to seal the crawl space completely and keep moisture levels in check to prevent the aforementioned issues related to high RH levels.

Question: What are the benefits of crawl space encapsulation?

• Protection of structural integrity: As previously mentioned, high moisture levels in the crawl space lead to structural damage with time since the wooden frames and flooring will rot. By encapsulating this area, you keep away moisture, and thus the aforementioned issues won’t appear. The procedure brings another perk to the table, namely that pests like rodents and termites are kept out of your home.
• Protection from mold: One of the top issues associated with high humidity is mold growth. When mold makes an appearance and the spores start lingering in the air, you will be faced with health problems after inhaling them. Some of these issues include coughing, wheezing, itching, and so on. People who suffer from asthma or allergies will face tougher consequences since their symptoms will act up.
• Air quality improvement: Mold spores, mildew, and other contaminants live in humid environments, lowering air quality. Therefore, crawl space encapsulation keeps the space free of these contaminants, improving air quality as a result.
• Your home will be more energy efficient: Electricity bills are bound to become less expensive as soon as you finish with the encapsulation procedure. In fact, it is estimated that the encapsulation procedure can reduce energy bills by up to 30%. Moisture levels won’t be high anymore so your heaters and air conditioners won’t have to work as hard to meet the conditions you expect from them.

Question: How long does crawl space encapsulation last?

If you call in a professional to handle the encapsulation procedure and use the best quality moisture barriers available at the moment, it will function for at least 20 years without issues. Just don’t cheap out on materials, you have a lot to gain in the long run if you proceed correctly with crawl space encapsulation, especially from a financial stance.

Question: How much does it cost to encapsulate the crawl space?

There is no set price for the procedure since the cost varies depending on several factors. One of the most important influential factors is the size of the crawl space. It generally costs approximately $2,500 to encapsulate an area of 1,000 square feet, and about $5,000 to encapsulate a 2,000 square foot area. However, costs can go as high as $10,000 if the problems you are dealing with in your crawl space are more complex, implying that material repairs or replacements are needed.

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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 of 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 moisture 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 switch between use in the crawl space and the cellar with these devices.

What is the ideal crawl space humidity?

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, hot 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.

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Conclusion

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. The products we reviewed here are the best when it comes to crawlway dampness reduction, hands down. Before we end, we want to briefly go over a few of the standout models we talked about here to help you make up your mind if you haven’t already made a decision.

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: Ecor Pro EPD150-PRO

This Ecor Pro model differs greatly from the other crawl space dehumidifiers we reviewed due to its design – this is a desiccant model, not a compressor model like the rest of the products. This makes it more resilient when it comes to running in low-temperature conditions. In fact, it’s able to withstand temperatures down to -4 degrees Fahrenheit, operating just as smoothly as it does when the temperature is at 70 degrees Fahrenheit. It is intended for spaces of up to 2,000 square feet and removes 74 pints of moisture per day, but it’s equivalent to a 150 PPD model.

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.