Best Crawl Space Dehumidifier Reviews (2020)

The crawl spaces under our houses are vulnerable to a lot of problems relating to poor air quality, the biggest problem usually being high humidity due to a lack of ventilation. It is this problem which leads most people to buy a crawl space dehumidifier.

High humidity in your home’s crawl space can lead to a lot of unpleasant consequences, such as mold problems, pest invasions, structural damage, bad odors, allergy triggers and more. As a result, taking proper care of your basement crawl space moisture problems is one of the most important things any home owner should do. Unfortunately, not everyone does. 

Crawl Space Dehumidifier

Closing up this vast area is one of several highly effective and energy efficient ways to make sure your home is more comfortable and has better air quality. However, if you choose to close this area (crawl space encapsulation), you still need to take care of both humidity and ventilation first. Just insulating your crawl space without considering how you will manage excess humidity with a dehumidifier can be as disastrous as leaving it as it is.

In this guide, we show you the best crawl space dehumidifier you can buy for any home.

Winner

#1st Rated
Winner

AlorAir Sentinel HD55

Perfect for small to medium sized crawl spaces.

Alternative Pick

#5 Stars
SantaFe Compact70

Santa Fe Compact70

Perfect for small to large sized crawl spaces.

Top Rated Crawl Space Dehumidifier Reviews

Winner

AlorAir Sentinel HD55 Dehumidifier

Best for medium sized crawl spaces

AlorAir Sentinel HD90

AlorAir Sentinel HDi90 Dehumidifier

Best for large crawl spaces

SantaFe Compact70

Sante Fe Compact70 Dehumidifier

Best alternative

Dri-Eaz F515

Dri Eaz F515 PHD 200 Compact

Great alternative

Dri-Eaz F413 Revolution LGR Review

Dri Eaz F413 Revolution LGR

Great alternative

Ivation 70 Pint Dehumidifier

Ivation 70 Pint Dehumidifier

Non heavy duty option

Buying A Crawlspace Dehumidifier

So, how does one go about dehumidifying their wet crawl space? There are a ton of dehumidification products on the market, but they are all designed for different environments and different rooms. What makes a dehumidifer that is suitable for this area different from others? There are several key things to consider:

Noise Output

The noise levels of the type of dehumidifier you would usually locate underneath your home isn't as relevant as the noise output of smaller models. Obviously, that doesn’t mean that you should buy a model that sounds like a freight train – you don’t want to hear it from up in your home – but you don’t need to care as much about your dehumidifier’s exact noise level.

Humidity Removal

Your dehumidifier needs to be powerful enough to dehumidify the entire crawl space. These areas are a considerable size as they cover the footprint of your entire home. Their square footage is significant, but they are also not as tall as a room. Simply put, measure the volume of the space beneath your home and decide on a model that is powerful enough to cover that volume. 70 pints of moisture per day is usually sufficient although 95 pints is perfect for larger areas. Dehumidifer performance is rated at either pints per day or pints per 24 hours.

Energy Efficiency

Power is one thing, but you are also interested in the dehumidifier’s efficiency. Dehumidifiers for crawl spaces are designed to work for long durations, so you want it to be as efficient in its energy consumption as possible whilst it works to remove excess moisture.

Drainage

Crawlspace dehumidifiers need an efficient continuous drainage system. If you were just buying this appliance for your kitchen, then using the onboard bucket wouldn’t be a big deal. But you certainly don’t want to have to make a trip downstairs a couple of times per day each day, so make sure that you choose a model that has a convenient continuous drainage system.

Low Temperature Operation

The appliance needs to work at low temperatures and have an auto defrost function. The auto defrost systems prevents the inner workings of the machine from building up frost and working at low temperatures is something that is often required in a basement and crawl space.

Auto Reset

An auto reset function is also pretty important for this type of dehumidification appliance. This function restarts the device after a power outage, keeping all of its original functions. This is great, since even if you are home it saves you an unnecessary trip underneath your property.

So, which are our top 5 picks for the best crawl space dehumidifiers on the market right now? We will list them below for your convenience, but you don’t need to limit yourself to just those 5 models – the market offers a lot of different options for a variety of different environments. We hope our crawl space dehumidifier reviews at least give you a good starting point for what you are looking for, if not an outright decision as to the best dehumidifier for your crawl space. 

Our Recommendations

Winner: AlorAir Sentinel HD55 Crawlspace 55 Pint Dehumidifier

The Sentinel HD55 from AlorAir is our recommendation for the best dehumidifier for crawl space use. Its a great commercial grade crawl-space dehumidifier with an Energy Star rating which makes it as efficient as it is powerful. It is suitable for much more than just the area beneath your home – as it can also perform well in a warehouse, an office, an apartment or a shop and other similar environments.

As a 55 pint model, the Sentinel HD55 has a coverage area of around 1300 square feet, depending on humidity levels. This is a good average power level which can cover both smaller but very damp crawl spaces, as well as larger, but not so damp ones.

A dehumidification appliance such as this one will be of great help in battling mold growth, mildew, heavy odors, or corrosion, which are so easy to form and develop in a non vented crawl space.

AlorAir Sentinel HD55 - Best Crawl-Space Dehumidifier
  • An Energy Star rated appliance that is highly energy efficient
  • A very good control system that includes an automatic humidistat control, water protection, a timer, and more
  • We are really hard pressed to find any negatives for this great commercial grade dehumidification appliance. If we had to mention one downside, it would be that 55 pints of water removal may not be enough for some homes

Runner-Up: AlorAir Sentinel HDi90 Crawl Space 90 Pint Dehumidifier 

Next on our list is another AlorAir model – the Sentinel HDi90. The chief difference you will notice immediately from our previous entry is the fact that this is a 90 pint model. As such, this model easily covers much bigger areas than the smaller Sentinel model and most other models.

This unit is designed for huge areas – with its 90 pint power and 210 CFM (Cubic Feet per Minute) coverage, the HDi90 is the perfect option for any area up to 2,600 square feet. And the great thing is that even with its immense power, the HDi90 is still surprisingly efficient. With a 2.88 L/kWh and only 5.56 amps the HDi90 will do its job both as effectively as possible and as efficiently as possible.

Best of all, this dehumidifier for crawl spaces has a built in condensate pump (make sure you order the pump version) which many owners will find essential.

AlorAir Sentinel HDi90 Crawlspace Dehumidifier
  • Huge CFM and power, making it great for large areas
  • The top crawl space dehumidifier with a built in pump
  • Very energy efficient
  • Features a hot gas system to defrost coils
  • Similar to the smaller, less powerful version, we were unable to identify any faults with this model during our testing period

Santa Fe Compact70 Crawl Space Dehumidifier

Formerly known as the Compact2, the Compact70 is Santa Fe's most popular dehumidifier and for good reason. It combines high-power performance with the most compact of designs, making it perfect for even the smallest of crawl spaces.

The Compact70 is capable of removing 70 pints of moisture per day under AHAM conditions which is an environment of 60% relative humidity and 80 degrees fahrenheit. This allows it to compete with much larger models with it capable of working in spaces up to 2,600 square feet. 

Humidity and fan speeds are controlled by simple dials and switches on the unit, allowing you to set a humidity level of anywhere between 20-80%. Purchase the remote humidistat and this can be done without having to enter your crawl space.

One of our favorite features are the number of customization options which are available. You can choose to hang this unit in several configurations as well as make use of optional accessories such as condensate pumps and ducting kits.

The Santa Fe Compact70 is perfect for most homeowners and will quickly and efficiently improve the air quality of the space beneath your home. Easily one of the best dehumidifiers for crawl spaces you can buy. 

Read our full review of the Santa Fe Compact70.

SantaFe Compact70
  • 2 stage air filtration with the use of pre-filters and MERV 13 filters
  • Very quiet operation
  • Energy star certification for maximum efficiency
  • Features an auto defrost function to quickly remove ice and frost
  • There are no drawbacks. Customers love it.

Dri Eaz F515 PHD 200 Compact 75 Pint Crawlspace Dehumidifier

Another great option for big crawl spaces, this Dri Eaz compact model pumps 75 pints of water from the air every 24 hours. It has two different operating modes – humidistat and continuous operation.

The humidistat mode works by maximizing moisture removal efficiency. It maintains a preset humidity level and adjusts its operation accordingly to the current humidity levels.

The continuous operation mode is exactly what it sounds like – you set the device to work continuously at one power setting until you say otherwise. This is ideal when you want to drop the humidity levels as fast as possible with zero downtime.

Dri-Eaz F515 Crawlspace Dehumidifier
  • Two modes of operation
  • Effective and efficient
  • The air filter needs to be replaced regularly

Dri Eaz F413 Revolution LGR Commercial Dehumidifier

Another small wonder by Dri Eaz, the Revolution model can pump up to 80 pints of moisture out of the air under standard conditions and more at higher temperatures and higher relative humidity. With a rating of 121 – 180 CFM and 6.2 amps, this is not just a very powerful dehumidifier, but a very efficient one as well. 


It also comes with an included 40’ drain hose, a 25’ power cord and a 3M HAF filter. This little dehumidifying dynamo displays real time inlet and outlet temperature and relative humidity and has a built-in humidistat. 


It is much smaller than other models of its power class, making it great for crawlspaces and other places where it might be required. It is also much easier to transport if you need it for more than one location.

Dri-Eaz F413 Dehumidifier For Crawl Space
  • Very small and compact for its size, making it more powerful than much bigger models
  • Includes a drain hose
  • For optimal operation this unit needs to be used above 65°F. Below that threshold its coils are prone to freezing

Ivation 70 Pint Energy Star Dehumidifier

Last but not least on our list is this 70 pint appliance from Ivation. This IVALDH70PW model is a more standard type of dehumidifying appliance, one that would fit well inside the home as well, not just in the area underneath your house. 

Its specifications make it well suited for a crawl space too, however, which is why we have to mention it. If you are looking for a portable dehumidifier which would need to temporarily be used in this location but can be moved inside your home after that, this Ivation model is the perfect option.

It is powerful enough to easily take care of all the mold, mildew, dust, allergens, and odors in any area or home of up to 4500 square feet of footprint (depending on the level of dampness too, of course). It has a programmable humidistat, a hose connector, an auto shutoff and auto restart function, as well as a bright and easy to use LED display. It’s not the quietest model on the market, but that shouldn't put you off given the location where you intend to use it.

Ivation IVALDH70PW Dehumidifier
  • Very easy operation
  • Extra-long cord
  • Drain hose needs to be purchased separately

The Importance Of Using The Best Dehumidifier For Your Crawl Space

High levels of humidity and condensation are a serious problem for your home's foundation. Since many homes in the US are constructed from timber, the presence of excess moisture in crawl space air is the perfect breeding ground for wood rot and other forms of timber decay in your floor joists. You can also expect an outbreak of mold and mildew to form if the levels of humidity are high enough. 

Over time, you will find that your foundation becomes weakened which in turn can affect the overall integrity of your property. In the worst case scenario, this moisture could rise through the construction of the crawlspace and enter the interior of your home itself, requiring water damage restoration. 

Why Is My Crawl Space Damp?

Usually for several reasons. Due to its location, your crawlspace is in close proximity to the ground or dirt floor which naturally contains a significant quantity of water. 

If there is a crack in your crawl space's walls and you lack a vapor barrier, this water can enter this area which will raise the level of internal humidity. Couple this with cool temperatures and insufficient ventilation (a lack of fresh air or outside air) and you are left with damp. 

Non-vented crawl spaces are particularly susceptible to this problem due to the lack of dry air. The presence of standing water can also quickly raise the level of humidity in this environment.

How Will A Dehumidifier Help?

Simply put, by lowering the level of humidity and pumping moisture out of the environment. In combination with sealing any cracks within the structure of your crawlspace, you will benefit from a more comfortable living environment and avoid costly repairs. For more detail: learn how a dehumidifier works.

You can also visit Corroventa for a detailed overview of this topic.

Active Crawl Space Dehumidification 

Musty odors will quickly become a thing of the past as the internal air volume beneath your house begins to dehumidify, loses moisture and becomes dry. A reduction in allergies and improved health in addition to preserving the structural integrity of your home are just some of the many benefits you can look forward to.

Dehumidifier Installation

A wall mount or ceiling mount is the most common installation option for many home owners. We suggest surveying the installation area to find a location that offers good access for maintenance and doesn't provide an obstruction.

It is also important to keep in mind how you intend to dispose of the moisture that is collected from the atmosphere, which is why we recommend choosing an installation location that is in close proximity to a drain if possible.

It is advisable to locate your new dehumidifier as centrally as possible, as this will allow it to operate more efficiently which should in turn remove moisture much faster with a more even distribution throughout the area.

Companies such as Dri Eaz also sell wall mounts for their product range so be sure to buy a set if you plan on a wall mounted installation.

Finally, we recommend removing as much dirt, dust and debris from the area as possible to prevent it from prematurely clogging the appliance's filters. Doing so should reduce the frequency that each filter needs to be removed for cleaning.

Dehumidifier Maintenance

These appliances are designed to run for extended periods of time without so much as an inspection. Once installed, there is no requirement to perform any maintenance other than to change the onboard air filters in conjunction with the recommendations detailed within the owners manual.


Best Dehumidifiers For Crawl Spaces

  1. AlorAir Sentinel HD55 - Best Value for Money
  2. AlorAir Sentinel HDi90 - Best Overall
  3. Santa Fe Compact70 - Best Alternative
  4. Dri-Eaz F515 PHD 200
  5. Dri-Eaz F413 Revolution
  6. Ivation 70 Pint Dehumidifier

There are our 6 suggestions for the best crawl space dehumidifier. Depending on the size of your crawlspace, as well as its dehumidification needs, different models can be better suited than others - but we firmly recommend the AlorAir Sentinel as our top pick. The other models we have tested also make great choices as do the Santa Fe Thermastor and Sante Fe Compact range as well as the Aprilaire 1850 dehumidifier range. It should be noted that all of these models can also be used as basement dehumidifiers

You might have noticed that we included the Ivation 70 pint model in this review for its versatility – it isn't specifically designed as a dehumidifier for crawl space - but it might be a good choice for those who live in smaller homes and don't need such a large dehumidifier.

If you are looking for a general guide to the best dehumidifiers which includes several reviews - we suggest that you check out our comprehensive dehumidifier buying guide.

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