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Dehumidifier for Crawl Space

Picture of a professional installing a dehumidifier for crawlspace
23

Models Considered

94

Hours of Research

5

Experts Interviewed

639

Consumer Reviews Analyzed

I nsulation or encapsulation does not suffice to prevent issues that include the likes of compromising structural stability, mold growth, and odors as dampness can still accumulate and affect the whole building. Small enough to fit the tightest crawlspaces, specialty dehumidifiers designed for this purpose generally provide higher capabilities when it comes down to dampness and space coverage. So, to keep moistness in check in the crawlspace, you need to get your hands on a reliable dehumidifying system in addition to insulating/encapsulating the space.

See also dehumidifiers for basement as the systems have a similarly high capability in terms of moistness reduction. These provide a more cost-effective solution, just make sure that the dehumidifier complies with the maximum height admitted by your crawlspace.

8. BaseAire AirWerx 55 – Best with Gravity Draining

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Specifications & Features:


  • Coverage: 1,300 square feet
  • Moisture draw: 55 PPD
  • Air movement: 130 CFM
  • Condensate pump:
  • Continuous drain:
  • Drain hose: 6.5’
  • Humidistat:
  • Humidity range: 30% – 95%
  • Filter: MERV-8
  • Ductable:
  • Refrigerant: R-410a
  • Automatic defrost:

  • Automatic restart:
  • Noise rating: 52 dB
  • Cord length: 8’
  • Lowest operational temperature: 33.8°F
  • Controls: Touch controls
  • Power factor: 2.47 L/kWh
  • Maximum amperage: 3.6 amps
  • Voltage: 115V
  • Casing: Metal
  • Size: 13.3″ H x 12.2″ W x 19.2″ D
  • Weight: 59 pounds
  • Manufacturer assurance: 5 years





Designed to prevent overheating and featuring a defrost system, it can run continuously without performance loss for years to come even when dampness conditions become dire. It tailors to spaces of up to 1,300 sq. ft., which suffices for small and normal-sized homes. Temperature drops don’t even present an issue for its operation seeing how it runs in spaces where levels are down to 33.8°F.

Optional remote controller makes it suitable for situations where remote control and sensing are a necessity.

Quick rundown:

  • Under AHAM terms, it relieves the air of 55 PPD tops, while at saturation, it goes upward to 125 PPD, reaching the ranks of commercial, as well as industrial systems granted by the powerful dehumidification it employs under the right circumstances.
  • It is fitted with a duct, which aids as you can opt for focused dehumidification to enhance moisture diminishing results.
  • Humidistat detects changes in moistness and acts upon them, making the system run as needed automatically to preserve your desired dampness level.
  • Relies on gravity draining to make your life easier as there is no need to manually throw out the water it gathers.
  • Hot gas valve enhances lifespan as freezing won’t occur when it comes to internal parts, even in near freezing conditions.

A remote control is available with the system, but you must acquire it independently if you want to change settings remotely in case access to the installation area is difficult or inconvenient. The memory starting function is another aspect we must underline as it preserves the settings even after a system restart, irrespective of the motive behind the occurrence, so no time is lost from your part to reinsert your preferred stats.

Expert consultant tip: ”Before you move or store the AirWerx 55 don’t forget to manually vacate the water in the system by leaning it towards the drain in a gentle manner.”Dave G.


Pros:
  • Dust and impurities are impeded from lingering in the air or producing damage as it uses multilayer aluminum filters
  • Frost formations are eliminated as they appear to prolong the system’s lifespan
  • Maintains operational prowess even in environments with poor air circulation
  • Optional remote controller available for time-saving and more convenient monitoring and use
  • Measures are set in place to prevent overheating

Cons:

✖ There were isolated reports concerning loss of performance after a couple of years



Verdict

Equipped to resist corrosion as time passes, convenient to use, and quite a force to be reckoned with in terms of excess moisture depletion, the AirWerx 55 is quite favored among specialists for smaller-sized crawlways and other tight spaces where dehumidification is needed.



7. Dri-Eaz F515 – Best with Pump

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Specifications & Features:


  • Coverage: 1,300 square feet
  • Moisture draw: 75 PPD
  • Air movement: 180 CFM
  • Condensate pump:
  • Continuous drain:
  • Drain hose: 20’
  • Humidistat:
  • Humidity range: 33% – 100%
  • Filter: Mesh
  • Ductable:
  • Refrigerant: R-410a
  • Automatic defrost:

  • Automatic restart:
  • Noise rating: 65 dB
  • Cord length: 6′
  • Lowest operational temperature: 45°F
  • Controls: Electronic
  • Power factor: N/A
  • Maximum amperage: 6.2 amps
  • Voltage: 110-120V
  • Casing: Rotomolded polyethylene
  • Size: 17.6″ H x 12.5″ W x 21.5″ D
  • Weight: 65 pounds
  • Manufacturer assurance: 1 year




With a small footprint that is actually hard to top as it measures 17.6” by 12.5” by 21.5”, fitting in cramped spaces just right, the F515 works for other spaces as well, including the likes of attics and stairwells. It features two built-in handles for easy transport and relocation, which combined with the relative light profile it boasts, make it easily portable. A feature we must put emphasis on before turning to performance aspects is the automated restart that prevents re-checking and rebooting the settings when the power returns on after an outage, ensuring it retakes operation as prior on its own.

Onboard self-diagnostic test system regularly checks for operational issues to let you know when intervention is required.

Quick rundown:

  • With a 75 PPD removal rate, it solves dampness and even comes in handy for water damage recovery projects, the maximum area size it works for being a sufficient 1,300 sq. ft.
  • Internal condensing pump drives the water through the 20’ hose when the reservoir is full or every 6 minutes, whichever comes first.
  • Two operational modes – humidistat and continuous .
  • Mesh particle filter keeps mold spores and dust from negatively impacting interior parts, while helping clean the air.
  • Even in chilly areas, it offers operational prowess awarded by the automatic thaw that prevents ice forming on the inner parts (suitable for temperatures down to 45°F).

It features recessed feet that allow piling up to 3 units, which gives you the opportunity of vertical storage to save space. Another design element that pleases is the rotomolded polyethylene casing that is made to withstand wear, even if use circumstances are not ideal. Fully fabricated in the U.S., reliability and long-lastingness are two of its main characteristics.

Expert consultant tip: ”Every month, inspect and clean its interior surfaces and coils so that dust doesn’t accumulate and restrict airflow, which would, in turn, cause overheating and execution loss.”Jim L.


Pros:
  • Space-saving design for proper fitting even in the most cramped spaces
  • Automatically expels the gathered water every 6 minutes tops
  • Onboard self-diagnosis for quick troubleshooting when needed to prolong lifespan
  • Runs in rough conditions – can endure temperatures down to 45°F
  • Stackable design to help save storage space through vertical placement of the units

Cons:

✖ Among the more costly options
✖ Pump purging concerns have been reported to appear at times



Verdict

Confined areas are generally problematic to deal with in regards to dehumidification, but the F515 gives a viable solution to upkeep normal moistness in almost any tight space in a building that springs to mind. It does not require much in the way of upkeep and provides dependable operation that is mostly automated so that you won’t be obligated to verify it regularly, two elements of value that add to its desirability for interested customers.



6. AlorAir Sentinel HD55 – Best in Winter

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Specifications & Features:


  • Coverage: 1,300 square feet
  • Moisture draw: 80 PPD
  • Air movement: 130 CFM
  • Condensate pump:
  • Continuous drain:
  • Drain hose: 6.5’
  • Humidistat:
  • Humidity range: 35% – 95%
  • Filter: G3
  • Ductable:
  • Refrigerant: R-410a
  • Automatic defrost:

  • Automatic restart:
  • Noise rating: 52 dB
  • Cord length: N/A
  • Lowest operational temperature: 33.8°F
  • Controls: Electronic
  • Power factor: 2.4 L/kWh
  • Maximum amperage: 3.6 amps
  • Voltage: 115V
  • Casing: Epoxy powder-coated steel
  • Size: 13.3″ H x 12.2″ W x 19.2″ D
  • Weight: 59 pounds
  • Manufacturer assurance: 5 years





The remote oversight function allows distant sensing and control, which comes in handy if access is difficult or restricted to the area of installation. There are no containers to empty as it runs, all due to the constant draining hose setup that grants 24-hour cycle operation. Thus, no time is wasted from your side, and zero effort is involved to upkeep its operation as well.

It is among the more energy efficient alternatives, which implies low running costs. Moreover, it is configured with safety and performance in mind, aspects that are highlighted by the ETL, cETL, and CE certifications.

Quick rundown:

  • The 80 PPD wetness wicking capability ensures that irrespective of how advanced dampness-related concerns are, mold growth is prevented once you install and use it as it rapidly normalizes humidity.
  • Automatically maintains moisture at your chosen level, letting you select RH to be held from 35% to 95%.
  • Epoxy coated coil design maintains heat exchange rate while preventing corrosion even when used in rough conditions.
  • Utilizes a rotary compressor to optimize efficiency related to humidity reduction without drawing much power to run so that costs are held at a minimum.
  • Can function at temperatures down to 33.8°F due to the presence of the defrosting procedure that has it periodically stop to set this function in motion so that it preserves system lifespan while helping lower running costs.

The side slide filter is easy to access when cleaning is required, which isn’t more than 1-2 times per year so that you are not inconvenienced too often. Aside from use in the crawlway, customers have successfully benefited from its functioning in sports halls, storage rooms, basements, garages, and even for water damage recovery. Furthermore, the 5-year manufacturer assurance is worth considering as it surpasses industry standard and implies you will be granted free fixes when needed.

Expert consultant tip: ”When you clean the G3 filter, either vacuum it or wash it gently using warm water without adding any solvents into the mixture.”Dave G.


Pros:
  • Features adjustable feet that allow quick and easy leveling
  • Stainless steel coated coils withstand corrosion
  • Hot gas melting system prevents ice buildup
  • Connection to ducting system is eased by the flanges
  • Uses the force of gravity to discharge the water so that manual labor is not required

Cons:

✖ Costly option in its performance range



Verdict

The HD55 is even Energy Star certified for its feat in terms of low power draw, so if you seek a budget-smart solution upkeep dryness, look no further. Designed for easy upkeep and functioning, it assures years of flawless operation to protect your home and health from the damaging consequences of high dampness.



5. Santa Fe Compact70 – Best for 2000 Square Feet

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Specifications & Features:


  • Coverage: 2,600 square feet
  • Moisture draw: 70 PPD
  • Air movement: 150 CFM
  • Condensate pump:
  • Continuous drain:
  • Drain hose: 8’
  • Humidistat:
  • Humidity range: 20% – 80%
  • Filter: Pre-filter, MERV-13
  • Ductable:
  • Refrigerant: R-410a
  • Automatic defrost:

  • Automatic restart:
  • Noise rating: 55 dB
  • Cord length: 9′
  • Lowest operational temperature: 49°F
  • Controls: Manual
  • Power factor: 2.4 L/kWh
  • Maximum amperage: 5.1 amps
  • Voltage: 115V
  • Casing: Metal
  • Size: 12″ H x 12″ W x 21″ D
  • Weight: 55 pounds
  • Manufacturer assurance: 6 years





The Santa Fe can maintain humidity at a selected scope spanning from 20% to 80%, when humidity levels are proper shutting off to cut back on running costs, and only turning back on when moistness exceeds the set barrier. The foam pre-filter and MERV-13 filter it features aid protect damage to internal components caused by airborne particles, dust, and mold spores, all while evidently enhancing air quality as it traps allergens. As the filters are cleanable and reusable, there is the added benefit of decreased maintenance costs as well.

The exhaust outlet can be rotated as you like so that you can opt for vertical or horizontal discharge, whichever suits your setup best.

Quick rundown:

  • Reliable in severely moist spaces, its capability to withdraw an estimated 70 pints per day ensures mold prevention is in check from the moment you run it.
  • It runs even when at 49°F, frost formations on the inner elements being handled on the spot by the auto defrosting function that turns the system off quick and tends to thaw the frost before resuming regular operation.
  • Meets Energy Star standards in terms of power draw, which implies that running costs are lower than with most similar systems.
  • You can set the fan to run even when the condenser is not turned on if you solely want to benefit from air circulation.
  • Upon the power returning after an outage, it recommences using the operational configurations you have previously set.

As it only produces an estimated 55 dB, you won’t hear it from the rooms situated above the crawlway. It is small enough to fit between joists, so you can hang it for installation if this is your preferred option. Moreover, there is quite an extensive range of compatible equipment and kits that you can acquire for it, including hang kits, remote ducting kits, and condenser pumps.

Expert consultant tip: ”Place it on a level surface to hinder improper drainage or leakage. If the area is not leveled, install leveling feet.”Arnold M.


Pros:
  • 2-stage air filtration shields internal components while capturing allergens
  • Automatic reset with settings preservation after a power outage
  • Designed to endure low operational temperatures
  • High energy conservation – surpasses Energy Star standards
  • Lets you elect vertical or horizontal discharge

Cons:

✖ Some complaints related to noise output



Verdict

Despite the compact sizing that is actually typical for crawlspace systems, the Santa Fe packs a fierce performance, its capability to wick upward to 70 PPD from spaces as large as 2,600 sq. ft. guaranteeing mold development and compromise of building integrity won’t ever be an issue.



4. BaseAire AirWerx 90 – Best for Basements




Specifications & Features:


  • Coverage : 2,600 square feet
  • Dehumidification capacity : 90 pints per day
  • Air movement : 210 CFM
  • Internal condensate pump :
  • Continuous drain :
  • Drain hose length : 19.6’
  • Humidistat :
  • Humidity range : 30% – 95%
  • Filter : MERV-8
  • Ductable :
  • Refrigerant : R-410a
  • Automatic defrost :

  • Automatic restart :
  • Noise level : 58 dB
  • Cord length : N/A
  • Lowest operational temperature : 33.8°F
  • Controls: Push buttons
  • Energy factor : 2.88 L/kWh
  • Maximum amperage: 5.56 amps
  • Voltage: 115V
  • Housing material: Metal
  • Dimensions: 17.7″ H x 15.2″ W x 23.2″ D
  • Weight: 78 pounds
  • Warranty : 5 years





Tailored for optimal functioning within an area of 2,600 sq. ft., it proves more than sufficient for dehumidifying the crawl space, an area that spans over a vast amount of space. What adds to its suitability for this specific scenario is that it wicks an estimated 90 pints of moistness, preventing mold growth through the effective performance it employs. It is quite energy-efficient seeing how it is rated at 2.88 L/KwH, enabling you to run it 24/7 without the electric bill skyrocketing as it would if you were to use a lesser product.

Aside from use in the crawl space or basement, the AirWerx 90 does just as thorough of a job at dehumidifying warehouses, factories, apartments, storage areas, museums, and offices.

Quick rundown:

  • Compact design – 23.2” x 15.2” x 17.7” – a perfect fit in this otherwise tight space. For basements, this subtle profile is an added bonus if you seek to transform the space in a recreational room, for example, as it won’t stand out and take away from the room’s ambiance.
  • Drain pipe measures 19.6’ and the top drain height is 14.7’ so that it disposes of the water as effectively as possible in the drain of your choice.
  • The epoxy-coated coils ensure that Freon leakage will not occur for added safety in use. This design trait also enhances heat transferability while ensuring that corrosive environments do not pose an issue, making it suited for the harshest conditions possible.
  • Touch controls for intuitive use, as well as a digital humidity readout that keeps you informed regarding conditions in the environment you are utilizing it to make adjustment to its operation according to current needs.
  • It makes less than 58 dB as it operates, you can even make an at-home office from the basement and run it when you work from home without the system presenting a distraction.

At saturation, expect it to wick up to 198 PPDa smart option for demanding water restoration. Considering the low power draw too, it is a heavy-duty system worth checking out closely before you make a decision. The 210 CFM airflow underlines its efficiency towards air circulation, ensuring mold and mildew development won’t be possible as fresh, moisture-free air is present in the space at all times as long as you run it.

It provides automatic humidistat control so that when the opted moistness level is reached it stops in its tracks and retakes its operation only when levels exceed your chosen barrier (this feature also adds to its cost-effectiveness as it won’t run more than needed). The memory starting feature is another highlight that is sure to sweeten the pot as it adds to convenience in use. What it does is ensure it picks up from where it left off when the power restarts after a blackout, without requiring you to re-insert the preferred settings.

The pre-filter it is fitted with comes as quite a pleasant surprise seeing how it ensures that the air circulated and relieved of excess moisture will be passed through purification as well, trapping potential air-polluting particles so that it makes the area safer for your health. Evidently, this feature comes in handy even more if you seek to install it in the basement, an area you will likely spend time in if you transform it in a usable extra room. Of course, we cannot end the review without mentioning that backing is provided for 5 years, defects that appear being handled free of charge as long as you subdue the system to proper use and installation.

Expert consultant tip: ”Make sure that you have added a vapor barrier in the space prior to setting it up and that all vents are sealed.”Harrison M.



Pros:
  • Memory start enables it to restart with the pre-selected settings after blackouts take place
  • Among the quieter systems available – makes less than 58 dB when it runs
  • Automatic humidistat control ensures upkeep of your selected moistness levels in an energy-efficient manner
  • 210 CFM airflow shows this is a system you can truly rely on for proper air circulation so that results toward air quality improvement are optimized
  • Extraction of 198 PPD at saturation makes it the go-to for water damage restauration projects

Cons:

✖ Not the lightest system – weighs 78 pounds



Verdict

Quite easy to work with an able to automatically upkeep the conditions you opt for, the AirWerx 90 is a go-to not only for the crawl space, but for other purposes as well, including moistness reduction of the basement, storage area, or even warehouse. Considering the large space it can accommodate, it’s safe to say that the asking price is more than fair, which adds to its desirability as a potential acquisition.



3. Aprilaire 1820 – Best for the Money

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Specifications & Features:


  • Coverage: 2,800 square feet
  • Moisture draw: 70 PPD
  • Air movement: 200 CFM
  • Condensate pump:
  • Continuous drain:
  • Drain hose: 10′
  • Humidistat:
  • Humidity range: 40% – 80%
  • Filter: MERV-8
  • Ductable:
  • Refrigerant: R-410a
  • Automatic defrost:

  • Automatic restart: N/A
  • Noise rating: 53 dB
  • Cord length: 8′
  • Lowest operational temperature: 40°F
  • Controls: Built-in digital control with display
  • Power factor: 2.1 L/kWh
  • Maximum amperage: 5.8 amps
  • Voltage: 120V
  • Casing: Metal
  • Size: 12.5″ H x 12.5″ W x 25″ D
  • Weight: 56 pounds
  • Manufacturer assurance: 5 years





Notorious for its small size yet fierce in terms of humidity removal abilities, the fact that it classifies among the low maintenance systems available adds to its appeal, actions like filter cleansing/substitution being necessary on an annual basis. Your work is further eased as it doesn’t require you to empty any water tray or reservoir, but rather place and level it directly above a drain or use the listed 10’ hose to guide the water it accumulates in a drainage spot of your choice.

You can separately acquire a Wi-Fi enabled controller that works with the Aprilaire to check on it and change settings remotely via your smartphone or tablet.

Quick rundown:

  • As its AHAM rating is 70 PPD, count on it to hinder mold, structural wood decay, as well as odors in a closed crawlway that does not exceed 2,800 sq. ft.
  • You can integrate it with your existing HVAC system for whole house moisture withdrawal as it includes 8” duct collars.
  • Automatically runs when it detects that wetness exceeds the objective level you want it to upkeep, halting only when levels drop 3% below the aforementioned setting.
  • The fan can disseminate the air even if the compressor is not set in function so that it eliminates variations and balances out temperature and relative humidity.
  • Interactive display helps you set the system up by yourself with ease so that you save money on professional installation.

The side filter access door provides you ease of reach to the MERV-8 filter so that you can wash it when dirt overly accumulates. For durability, the inner coils are made with corrosion-inhibiting aluminum so that it withstands years of use in a harsh environment without repercussions. Moreover, the 5-year guarantee provides ease of mind regarding potential malfunctions or manufacturing-related defects, during this time span service by Aprilaire professional being granted for free.

Expert consultant tip: ”On an annual basis, check the drain to make sure that nothing is blocking it or restricting the air in the discharge system. Call in a qualified service specialist if it stops draining right.”Randal H.


Pros:
  • Automatic operation when humidity exceeds your selected level
  • Low-profile design makes it cater to crawlways and attics alike
  • Can be connected to the HVAC system to grant moistness reduction throughout the entire house
  • Aluminum condenser coil withstands corrosion even in harsh environments
  • Low maintenance system – only demands filter checking/replacing once per year

Cons:

✖ Troubleshooting is a tad difficult
✖ Complaints regarding tech support promptitude



Verdict

The blower draws in air and clears dampness, as well as contaminants so that it discharges dry, clean air back into the space you install it in. If you apply its functioning for areas that don’t surpass 2,800 sq. ft., rest assured that irrespective of how severe dampness concerns are, it will address them quickly due to its 70 PPD wetness removal rating it flaunts.



2. AlorAir Sentinel HDi90 – Editor’s Choice

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Specifications & Features:


  • Coverage: 2,600 square feet
  • Moisture draw: 90 PPD
  • Air movement: 210 CFM
  • Condensate pump:
  • Continuous drain:
  • Drain hose: 19.7′
  • Humidistat:
  • Humidity range: 35% – 95%
  • Filter: Clean air filter, HEPA, MERV-8
  • Ductable:
  • Refrigerant: R-410a
  • Automatic defrost:

  • Automatic restart:
  • Noise rating: 58 dB
  • Cord length: N/A
  • Lowest operational temperature: 33°F
  • Controls: Electronic
  • Power factor: 2.88 L/kWh
  • Maximum amperage: 5.56 amps
  • Voltage: 115V
  • Casing: Epoxy powder-coated steel
  • Size: 17.7″ H x 15.2″ W x 23.2″ D
  • Weight: 78 pounds
  • Manufacturer assurance: 5 years





Through its heavy-duty performance, the Sentinel HDi90 actually supplements the AC system when the weather is hot and helps retain moisture balance throughout the year. Intended to tailor to modern users, all that it requires is that you set it up, select your preferred dampness setting, and let it run a continuous operational cycle granted by the addition of the discharge hose that deports the gathered moisture to an exterior location or drain of your choice. When the desired air wetness level is achieved, it automatically cuts off operation until moisture rises again so that it saves energy.

Built to be deployed for applications that include crawlways, basements, depots, restoration jobs, garages, offices, and laboratories.

Quick rundown:

  • Under AHAM terms, it clears upward to 90 PPD in spaces of up to 2,600 sq. ft., which is quite a feat taking into account the low power draw and compact design it flaunts.
  • You can add a duct to link it to the existing HVAC system to benefit from whole house dehumidification or for the purpose of focusing and enhancing its moistness removal abilities.
  • It relies on an internal condensate pump to drive the water into the drain at a distance of over 16.4’, sparing you of manually emptying buckets or reservoirs as classic dehumidifiers do.
  • Internal coils are coated to hinder corrosion and preserve heat transfer rate to these parts.
  • Hot gas valve thawing ensures automatic clearing of ice formations on inner parts even in low temperatures so that no damage ensues when the weather turns cold.

In lieu of most systems that solely use a single air filtration means, it actually uses a total of 3, including a washable filter that serves the objective of trapping mold spores and particles to reduce air pollution. Design-wise, the erosion protection layer makes it purvey use in corroding environments.

The plug-and-play system is easy to take up as a DIY installation project, hence you won’t need to call in a specialist and waste extra cash. It is among the more discrete options out there too, producing an estimated 58 dB to barely be hard as it runs even when you are in the room situated above its placement in the crawlway. For extra convenience, it presents you with transport handles to grab onto easily during relocation or storage.

Expert consultant tip: ”Where you install the Sentinel, make sure that it is provided a minimum 12” clearance for the inlet and 36” clearance for the discharge.”Harrison M.


Pros:
  • Inner pump for convenient continuous operation
  • Relies on an effective hot gas system to defrost internal coils when needed
  • Adequate for a wide range of uses, including restoration jobs
  • Ducting options let you transform it in a whole house dehumidification system
  • Corrosion-resistant build makes it adequate for use in harsh environments

Cons:

✖ To drain farther away from the system, you must acquire a custom 8” tube
✖ Remote control available through separate purchase



Verdict

Able to remove upward to 90 PPD under AHAM requirements, the HDi90 is suited for a wide range of uses, including commercial purposes, not only for crawlway dehumidification. Silent and effective in ample spaces, and even designed to withstand corrosive conditions, what you can be sure of is that no fluctuations will occur in its operation with the passing of time.



1. Dri-Eaz F413 – Best on the Market

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Specifications & Features:


  • Coverage: 7,000 square feet
  • Moisture draw: 80 PPD
  • Air movement: 180 CFM
  • Condensate pump:
  • Continuous drain:
  • Drain hose: 40′
  • Humidistat:
  • Humidity range: 30% – 90%
  • Filter: HAF
  • Ductable:
  • Refrigerant: R-410a
  • Automatic defrost:

  • Automatic restart:
  • Noise rating: 55 dB
  • Cord length: 25′
  • Lowest operational temperature: 33°F
  • Controls: Electronic
  • Power factor: 2.21 L/kWh
  • Maximum amperage: 6.2 amps
  • Voltage: 110-120V
  • Casing: Rotomolded polyethylene
  • Size: 17.6″ H x 12.5″ W x 21.5″ D
  • Weight: 65 pounds
  • Manufacturer assurance: 1 year , 6 years , lifetime





The F413 differs rather considerably from competitors as it is a heavy-duty model which complies with residential, as well as industrial and commercial needs regarding dehumidification. Design-wise, it is easy to tell the purpose or space for which it is intended for use (the crawlway) given that it measures only 17.6 inches by 12.5 inches by 21.5 inches, easily fitting in tight spaces.

Due to its recessed feet indents, you can pile up to 3 units securely for transport or space-saving vertical storage.
Commercial-grade dehumidification

As aforementioned, despite the compact design, it really packs a punch, which is best seen in the following dehumidification influencing stats:

  • Designed for areas upward to 7,000 sq. ft., it is easy to see why we rate it as a commercial-grade system, handling spaces other options cannot be relied on for.
  • Under AHAM conditions, the inner pump can wick an estimated 80 PPD over a 24-hour time period. Thus, regardless of how severe dampness concerns are prior to setting it up, they will become obsolete.
  • High 180 CFM rating ensures optimal air movement so that circulation is maximized. This evidently further enhances its success rate toward mold prevention.
  • While through their design, these systems are indeed capable to function even in low temperatures, the ability of the F413 to run free of ice formations on the coils even at 33°F is a feat on its own.
Real-time data

Tracking environmental factors is simplified as on the easy-to-read display, it provides real-time data regarding relative air moistness and intake and discharge temperature. This way, simply glancing at the display suffices to get a grip on how conditions are presenting to take appropriate measures and rectify potential issues (for example, set it to run for longer hours as needed if dampness levels tend to get out of hand).

Extra features
  • Automatic humidistat: Lets you set the dampness level, automatically making adjustments to its process to preserve moisture as you see fit.
  • Automatic restart: System reboot after a blackout does not imply resetting your preferred configuration as it picks up functioning as you previously set it.
  • Automatic thawing: Prevents ice formations on the inner coils so that it will not damage when it operates in low-temperature conditions.
  • Cord/drain hose storage: Side storage for the 25’ cord and 40’ discharge hose that helps save space when it is not in use.
  • Carry handles: On top, it is tailored with two handles for ease of transport and repositioning.

Expert consultant tip: ”Mind that the 3M HAF filter can be cleaned and reused up to 3 times before you need to replace it altogether. When you do notice buildup on the filter, do not wash it off but rather vacuum it.”Jim L.


Pros:
  • Designed for use in large areas
  • Compact design helps it fit in the tightest of spaces
  • Heavy-duty inner pump draws 80 PPD of dampness
  • 3M HAF filter effectively traps air pollutants
  • Automatic humidity control spares you of any operation-related hassle

Cons:

✖ High asking price



Verdict

The Dri-Eaz might be small, but as it is assessed to cover an extensive 7,000 sq. ft. area, you can see why it tops competitors. A favorite among professionals, its internal pump aids relieve the air of 80 PPD so that moisture-related issues like mold never arise. Despite the high upfront cost, considering its application and efficiency, your money goes toward a long-lasting system that actually delivers on the promise to supply continuous use without being impacted by environmental conditions.



Top 8 Crawlspace Dehumidifiers Comparison

Photo Products Price
Dri-Eaz F413 Image
Best for Sale
1. Dri-Eaz F413
  • Scope of application: 7,000 sq. ft.
  • Moisture reduction: 80 PPD
  • Air circulation: 180 CFM
  • Drain hose size: 40′
  • Automatic defrosting:
  • Automatic restart:
  • Lowest operational temperature: 33°F
  • Power factor: 2.21 L/kWh
  • Guarantee: 1 year , 6 years , lifetime
Check Price at Amazon
AlorAir Sentinel HDi90 Image
Editor’s Choice
2. AlorAir Sentinel HDi90
  • Scope of application: 2,600 sq. ft.
  • Moisture reduction: 90 PPD
  • Air circulation: 210 CFM
  • Drain hose size: 19.7′
  • Automatic defrosting:
  • Automatic restart:
  • Lowest operational temperature: 33°F
  • Power factor: 2.88 L/kWh
  • Guarantee: 5 years
Check Price at Amazon
Aprilaire 1820 Image
Best for the Money
3. Aprilaire 1820
  • Scope of application: 2,800 sq. ft.
  • Moisture reduction: 70 PPD
  • Air circulation: 200 CFM
  • Drain hose size: 10′
  • Automatic defrosting:
  • Automatic restart: N/A
  • Lowest operational temperature: 40°F
  • Power factor: 2.1 L/kWh
  • Guarantee: 5 years
Check Price at Amazon
BaseAire AirWerx 90 Image
Best for Basements
4. BaseAire AirWerx 90
  • Covers up to : 2,600 sq. ft.
  • Moisture removal : 90 PPD
  • Airflow : 210 CFM
  • Drain hose length : 19.6′
  • Automatic defrost :
  • Automatic restart :
  • Lowest operational temperature : 33.8°F
  • Energy factor : 2.88 L/kWh
  • Warranty : 5 years
Santa Fe Compact70 Image
Best for 2000 Square Feet
5. Santa Fe Compact70
  • Scope of application: 2,600 sq. ft.
  • Moisture reduction: 70 PPD
  • Air circulation: 150 CFM
  • Drain hose size: 8′
  • Automatic defrosting:
  • Automatic restart:
  • Lowest operational temperature: 49°F
  • Power factor: 2.4 L/kWh
  • Guarantee: 6 years
Check Price at Amazon
AlorAir Sentinel HD55 Image
Best in Winter
6. AlorAir Sentinel HD55
  • Scope of application: 1,300 sq. ft.
  • Moisture reduction: 80 PPD
  • Air circulation: 130 CFM
  • Drain hose size: 6.5′
  • Automatic defrosting:
  • Automatic restart:
  • Lowest operational temperature: 33.8°F
  • Power factor: 2.4 L/kWh
  • Guarantee: 5 years
Check Price at Amazon
Dri-Eaz F515 Image
Best with Pump
7. Dri-Eaz F515
  • Scope of application: 1,300 sq. ft.
  • Moisture reduction: 75 PPD
  • Air circulation: 180 CFM
  • Drain hose size: 20′
  • Automatic defrosting:
  • Automatic restart:
  • Lowest operational temperature: 45°F
  • Power factor: N/A
  • Guarantee: 1 year
Check Price at Amazon
BaseAire AirWerx 55 Image
Best with Gravity Draining
8. BaseAire AirWerx 55
  • Scope of application: 1,300 sq. ft.
  • Moisture reduction: 55 PPD
  • Air circulation: 130 CFM
  • Drain hose size: 6.5′
  • Automatic defrosting:
  • Automatic restart:
  • Lowest operational temperature: 33.8°F
  • Power factor: 2.47 L/kWh
  • Guarantee: 5 years
Check Price at Amazon

Picture of a Santa Fe dehumidifier installed with level support in the crawlspace

Buying Guide

Dehumidification Capabilities

This relates to the moisture quantity it can collect throughout the day. Generally, the systems are assessed for their efficiency under AHAM terms, along with saturation conditions. We advise you focus on the AHAM terms as these are more realistic in regards to the actual execution you expect the system to provide.

Optimal Space Coverage

We cannot stress enough the relevance of proper area coverage as an underperforming system will inevitably not tackle moisture reduction properly, while an over-performing system runs operational expenses much higher than needed for the size of your crawlway and is likely more costly, to begin with. Evidently, to follow through correctly, you must first take measurements to learn the size of the space so that you can acquire a system that matches it.

Presence of a Pump

We suggest a model that already features a pump (these can be obtained separately if needed too) as the role of this piece is to drive the collected water to the discharge spot you choose so that no work on your part is necessary to clear the tank.

Best option: Dri-Eaz F413
Size

As a rule, the area under the house tends to be cramped and tight, so it is preferable to look for a compact system that you won’t have trouble installing in it. However, you should first take measurements to limit your search options solely to what is actually compatible.

Best option: Santa Fe Compact70
Useful Extra Features

These systems are not generally as feature-rich as their traditional counterparts, but there are still some functions and elements that you could benefit from, including:

  • Intuitive, easy-to-read controls: For ease of use and to ensure that you select and benefit from the right level of dehumidification when you run the system.
  • Automated restart: The memory start function abolishes the need to reinsert your favored settings after a forced restart as it takes up operation automatically with the prior parameters set in place.
  • Automatic defrost: Prolonged lifespan granted as it automatically disables when frost forms on the coils to dispose of it, resuming process when the situation is fixed so that damage is avoided.
  • Automatic functioning: Powers on and off as needed to preserve your chosen humidity setting and reduce operational costs.
Warranty

Irrespective of the system you pick, one thing is for sure – it won’t be a low-cost acquisition. Keeping the asking price in mind, it is easy to see why a long warranty is preferable as it covers costs related to repairs if faulty manufacturing is an issue or certain repairs are needed down the road.

Best option: Dri-Eaz F413


Picture of a professional installing a dehumidifier for crawlspace

How to Install


  • Before you actually jump in for the installation process, you must first think of a proper location for it. Ideally, it should be positioned somewhere with easy access for airflow discharge.
  • Take drainage into account as well, if you have one available placing the system in its vicinity. If not, you can add a condensation pump and evacuate the water to an exterior location.
  • Secure easy access for adjustment of the humidity regulator and routine upkeep tasks.
  • Place it on concrete blocks even if the surface is flattened so that in case water starts puddling, it won’t reach the dehumidifier.

Ducting benefits those who have unusually shaped or divided crawlways as air discharge is performed much further away from the dehumidifier. Moreover, there is the added benefit that drying is conducted in a more efficient manner, and the energy conservation of running cycles is amplified as well. If you want to duct it, the manner of installation actually relies on the setup of the crawlspace, so you must follow as instructed depending in which of the categories your situations fits:

U-shaped space: Position the system at the center of the “U” and use flexible ducting to divide the intake from the exhaust.

Rectangular space: Place it at whatever end of the crawlway you prefer and separate the intake from the exhaust using flexible ducting.

Divided space: Extend the exhaust from one section to another using ductwork. If possible, make holes in the dividing walls so that air can circulate more freely between the sections.


Picture of an encapsulation job for a crawlspace done by professionals

Crawlspace Encapsulation


Q: What is encapsulation?
A: It is the process of coating the entire crawlway (the floors, walls, and even the ceiling) with a vapor barrier that helps control the air to sustain healthy air moisture levels.
How Encapsulation Benefits You

Seeing how 40% – 50% of the air in your home actually flows from the area beneath it, you can see right from the get-go why it isn’t a space you should neglect in terms of air quality as the conditions in it inevitably take a toll on the rest of the building as well. Thus, your efforts to use air purifiers could be nullified in an instant by the protruding of air infested with mold spores and bacteria from the crawlway.

Vapor barrier benefits:

  • Enhancement of living conditions;
  • Aids in avoiding structural damage;
  • Air quality improvement;
  • Makes it less likely for pests and insects to invade this area;
  • Helps enhance power saving in your home for lower household costs.
Encapsulation Instructions
Costs to call in a professional can scope from roughly $1,500 to well over $10,000 but the pricing evidently depends on how vast the area is, what materials and supplies are required, as well as the regular fees of the professional laborer you pick. For this reason, many homeowners, at least those who have a knack for DIY projects, prefer to take it up on their own. However, if you feel overwhelmed by the procedure, instead of risking to follow through improperly with it, seek professional help.

The typical process of crawlway encapsulation is composed of two parts, one that must take place before the actual encapsulation begins, and another where the vapor barrier is set.

Before Encapsulation:

  • Assess and clean the whole space if needed. Take as much time as you need to follow through properly as you could end up puncturing the barrier if rocks, for example, are left behind.
  • Measure the sections you intend to encapsulate – the walls, floor, and ceiling.
  • Cut barrier materials slightly larger than the measurements you took for each area so that you don’t accidentally leave gaps.

Adding the Vapor Barrier:

  • Beneath the floor joists, place double-sided seal tape and proceed to attack the plastic barrier along the walls.
  • When you do so, take your time to carefully press down so that you maintain consistency as much as possible in the barrier you create.
  • When you finish with the walls, you can proceed with the floor surface, followed by the ceiling if you consider encapsulating it is needed too.
  • As you follow through with the whole process, make sure to properly seal windows and vents.

Frequently Asked Questions



?Is dehumidifying necessary?
Yes, damage associated with dampness in this area can actually lead to a number of problems, including structural safety issues, which in turn compromise building integrity. Add to this the fact that mold development can take a toll on your health too, and you can see why we answered yes. However, make sure there are no puddles or leaks there, to begin with (if these issues exist, solve them first), and if mold growth is already an issue by this point, resolve it before you install the system as it is a preventive measure, not a problem solver.

?Is dampness normal in this area?
Woefully, this is quite a common occurrence as the below-grade level at which it is situated favors dampness. Water can actually wind up here too as a result of leaks, a saturation of the soil surrounding the foundation after heavy rains or snowstorms, as well as plumbing issues. However, while odds are that moistness and even water puddles will affect the crawlspace, it does not mean that you should let things get out of hand but rather solve the situation as soon as possible as implications are dire for the building, as well as its inhabitants.

?Do I need to vent my crawlway?
Seeing how building codes and regulations actually require the presence of working vents in the crawlway, the answer is yes. If you are wondering why, the answer is quite simple – exterior air must circulate properly under the floor during the warmer seasons so that moisture does not increase dangerously, which in turn would lead to mildew, mold, and decay of wood structures.

?What humidity level should I aim to upkeep?
The recommended level for crawlway humidity is 55%, but anywhere from 30% and 60% is generally safe toward protecting the building’s structure and mold prevention.

?At what humidity does mold develop?
When RH levels exceed 60% – 70%, the mold becomes an inevitable guest. The same goes for any other space or room of the house for that matter, so take this aspect into consideration for the whole building rather than a singular area.

?Is insulating worth it?
While costly depending on how you plan to follow through with the procedure, crawlway insulation is actually somewhat mandatory seeing how it helps eliminate cold spots in the rooms situated above it, as well as preventing mold from affecting air quality and purity across the entire house.

?Can I use a regular dehumidification system in a crawlspace?
Aside for the obvious reason why this is most likely not possible, more precisely that the below-ground area is much smaller and more cramped than the rest of your home, rendering impossible to fit a regular-size dehumidifier inside, there is the fact that a crawlway system provides, through its specialty design, increased airflow to circulate air at a more rapid pace and handle excessive moisture.

?What is the cost of mold remediation?
When it comes to the crawlspace, the cost of mold remediation services start at around $500 and fluctuates higher depending on exactly how large the space is. Expect to pay thousands of dollars if the area is vast and mold damage is advanced.

?Is vinegar or hydrogen peroxide better for mold?
Both are actually equally optimal solutions to tackle mold removal anywhere in your home, not only when it comes to this specific area.

?Can crawlspace conditions affect your health?
Yes, considering how an estimated 40% of the air indoors actually flows from this specific area, if mold spores linger in the air they inevitably end up in the living quarters. For individuals who suffer from asthma and allergies, the inhalation of mold spores presents a dire danger, but healthy people alike can develop respiratory tract issues because of breathing in the polluted, unclean air.


Conclusion

Mold, mildew, and rot are difficulties likely all homeowners are faced with even after encapsulation or insulation, measures that reduce water puddling but don’t necessarily tackle dampness as effectively. In reality, the addition of a dehumidification system is mandatory rather than optional as you risk compromising the construction, as well as health endangerment if you allow moisture to rise and the aforementioned problems to appear. However, do remember that, as opposed to other areas that have a normal height to the ceiling, the same isn’t valid with the crawlway, which is why specialty systems have been manufactured for use here.

As an alternative, if the height measurement of the crawlspace allows it and you find an option within the needed parameters, you can use a dehumidifier for basement as it is the only compatible option in terms of moistness reduction performance.

Best dehumidifier for crawlspace on the market: Dri-Eaz F413

It was inevitable for the F413 to rank high seeing how it actually handles vast spaces upwards to 7,000 sq. ft., considerably more than all of its competitors. As a result, it is equally suitable for industrial and commercial purposes. Seeing how it is rated for 80 PPD at AHAM conditions and 139 PPD at saturation, it will effortlessly handle reducing moisture as needed to preserve a healthy, safe living environment. A rather heavy-duty system as opposed to competitors and quite feature-rich as it includes the likes of memory restart and ducting capability, it wicks excess moistness rapidly to prevent mold development regardless of how severe your current situation is.

Editor’s choice: AlorAir Sentinel HDi90

This 90 PPD heavy-duty model caught our eye not only through its operational efficiency, both in terms of low power draw, as well as fixing moisture-related issues quickly, but through the modern design that makes it tailor to the most pretentious individuals. The internal condensate pump directs the water to a drain or outside location of your choice. Speaking of automatic features, when a system restart undergoes, it reboots without requiring a reset of the pre-selected settings as it memorizes them.

Best crawlspace dehumidifier in winter: AlorAir Sentinel HD55

If the weather doesn’t become absurd and temperatures don’t go lower than 33.8°F during winter, use the Sentinel HD55 to provide servicing and upkeep healthy humidity without succumbing to damage caused by freezing of internal components. What makes it so effective, you ask? Well, it’s simple – the combination of epoxy coils that maintain proper heat transfer with the defrosting function that starts on its own when frost starts to build.

Best crawlspace dehumidifier for 2000 square feet: Santa Fe Compact70

It is actually rated to perform at its peak in areas upward to 2,600 square feet, but this makes it just as efficient for coverage a tad smaller as it fixes excess air moistness faster due to its heavier-duty operation. The small footprint also helps as it measures a mere 12” by 12” by 21”, so irrespective of how cramped the space is, you won’t have trouble installing it.

Best crawlspace dehumidifier for the money: Aprilaire 1820

Perfect for medium-sized crawlways, this Aprilaire flaunts a price-to-quality ratio that is unbeatable by any other entry in its operational range. A must-have for financially responsible folk who seek the best value, you can depend on it to handle an estimated 70 PPD. Moreover, it is among the more cost-efficient systems to run as well, the 2.1 L/kWh energy factor rating ensuring you won’t see a major variance in the electric bills as you run it either.

Tobey Hunter
Tobey Hunter
Tobey is the editor-in-chief at Optima Institute, his prior experience as a niche product reviewer in air quality improvement systems helping shape his path to conduct thorough research toward selecting and analyzing products so that customers are satisfied with the provided recommendations. During his carrier, Tobey also gathered technical input that makes him well versed in understanding advancements in modern systems, helping readers in turn to better understand how modern devices help improve life quality.