Best Crawl Space Dehumidifier – Reviews & Ratings

Last Updated on February 20, 2024 by Justin Williams

You may not think about it but your crawl space is a good source for mold, germs and other destructive bacteria. Most people think about dehumidifying their living areas as that is where they spend most of their time.

But if you want your home to be completely moist free and healthy, you need to dehumidify your crawl space. Finding the best dehumidifier for crawl space can get tricky, but worry not, here are the top 5 under house dehumidifiers that will help you make your house a healthy home.

The 5 Best Dehumidifiers for Crawl Space in 2024

The Best Crawl Space Dehumidifier Reviews in 2024




Water Extraction

Editor Ratings


Aprilaire E100C Pro 100 Pint Dehumidifier with Casters for Crawl Spaces review


100 pints per 24 hrs


Drieaz F515 PHD 200 Compact Dehumidifier for Crawl Space


80 pints per 24 hrs


alorair sentinel hdi90 crawl space dehumidifier review


90 pints per 24 hrs


 Aprilaire E70 Pro 70 Pint Dehumidifier for Crawl Spaces


70 pints per 24 hrs


AlorAir Sentinel HD55 Crawl Space Dehumidifier


55 pints per 24 hrs

Here are a few FAQs about humidity in crawlspaces:

1. Why is Your Crawl Space So Wet?

A crawlspace may get wet because water found a way into it. Most humidity problems in crawlspaces are caused by cracks in the home's foundation or walls. These cracks actually let water inside your home and make it feel damp.

Some other causes may include improper ventilation, lack of regular maintenance and poor drainage systems. It is also important to take care of the dirt floor in crawl spaces by sealing it to avoid excess moisture from coming inside the home.

2. The Consequences That Caused by Wet Crawl Space

A wet crawlspace is always a bad sign about a house's structure. If you have a wet crawlspace, you can suffer consequences like mold and mildew growth. If the crawlspace is moist, the organic matter found in the moisture makes it perfect for mold and mildew to populate the space. As we all know, mold and mildew can bring about many health problems to homeowners.

Crawl Space Moisture Problem


Aside from mold buildup, the house's structure may also deteriorate because of high humidity. If the structure of the house weakens, more cracks may appear on the walls and allow even more water accumulation into the home. Aside from that, it can also allow pests like rodents and other insects to enter the area.

Also, a large percentage of air that goes in and circulates the home comes from the crawlspace. The air below your home seeps through your floors and around your heating and air ducts. Thus, the air surrounding your home is going to be unsafe. Hence, if the air below the house is riddled with bacteria because of the mold and mildew buildup, the air you are breathing inside your home may not be safe for your health.

Some of the health problems related to this type of problem include headaches, respiratory complications as well as fevers. Hence, it is very important to keep your crawlspace dry and safe from mold or mildew buildup.

3. How Will A Crawl Space Dehumidifier Help?

The consequences mentioned above can easily be addressed by keeping the crawlspace dry. Moisture and water can cause a lot of problems. Wet insulation, as well as standing water must be extracted. There are various ways to do so, but experts believe that using a dehumidifier would be the best option.

Most homeowners use vents to keep their crawlspace dry. However, experts believe that this is not enough because it can add more damage to the already impaired walls. Installing a vent entails putting a hole in the wall for the vent to get into. This may cause even more cracks to the wall and collect even more water at the edge of your home.

Other homeowners put up gravel and vapor barriers to keep humidity levels low. This, however, does not consider the fact that excess moisture can still find a way into the crawlspace through the dirt floor. A vapor barrier cannot keep the water out because of the already existing cracks that continuously let water in. Therefore, it is important to install a dehumidifier that can do just that.

What to Look for in Buying the Best Dehumidifier for Crawl Space Under House

There are a lot of dehumidifiers in the market today. If you want to find one for your home, here is a list of things you should consider:

  • Price - Never go over your budget. Not all dehumidifiers come with a big price tag. If you do your research, you will surely find one that is within your living expense budget. It is harder to get into debt just because of your dehumidifier purchase. This product is aimed to protect your home and not be the cause for you to lose your home because you can no longer handle your living expenses upon its purchase.
  • Size - Dehumidifiers usually come in bulky sizes. So, it is best to install a dehumidifier that will perfectly fit in your home and address your needs. It is also best to buy a portable dehumidifier because it can be easily transported from one place to another. A portable dehumidifier will be perfect if you need to change homes. You can easily ship it to your new address instead of living it behind your old home.
  • Energy Efficiency - Dehumidifiers are big machines that can consume large amounts of energy. Again, it is better to stay within your means. So, if you buy a machine that consumes huge energy power, you may end up with bigger utility bills. Hence, it is important to check the energy consumption of the products you are looking into before buying.
  • Other Features - Most dehumidifiers come with features like air filtration, automatic switch, remote control and alarms. It is best to look into the added features of the product before purchasing. Air filtration is best for highly humid basements to ensure that bacteria build up will be avoided in the space.

Here are the 5 best crawl space dehumidifiers on the market today just help you choose the suitable one for your home.

Aprilaire E100C Pro 100 Pint Dehumidifier review

This commercial crawl space dehumidifier may only be about 18 ½ inches in size but it pulls more than its weight in moisture from your crawl space. You can expect up to 100 pints of moisture taken from your crawl space every day.

The unit is rated for spaces measuring up to 5,500 square feet. Its built-in humidistat and controls leave you in charge of dehumidifying your crawl space. The Aprilaire E100C requires little to no maintenance with no untidy water tank or dirty water container to empty, and an easy annual filter replacement or cleaning.

Also, the unit comes with smart sensing technology that allows the device to start dehumidifying automatically when humidity goes over a certain level. The device was designed and manufactured by Aprilaire in the US and was built to last. Coils are made of corrosion-resistant aluminum in a strict manufacturing process to prevent leaks.

It works quite well and up to expectations. Perfect for crawl space moisture problems that harm your home. Then the unit does not use that much electricity as it does its job. Moreover, it comes with a 5-year warranty.

What We Liked

  • Large coverage area
  • Touch controls
  • Long cord and drain hose

What We Didn't Like

  • Some leakage issues
  • Warranty problems when purchased from 3rd party seller
96 /100
Our Ratings

Drieaz F515 PHD 200 Compact Dehumidifier Review

The PHD 200 unit can be suspended from your joists for better operation. The included straps are strong enough to hold this 12 ½ inch dehumidifier up in the air. Along with the straps, you get a long power and drain cord, allowing you to place this unit where you need it most.

You also can drain the removed moisture directly into a basement sink with ease. The drain hose hooks up directly to the unit and should be long enough to reach a sink or basement drain.

Even if you do not have enough light, you can still set the controls easily. The touchscreen allows you to set your humidity level and other functions with a touch of a finger. Plus, the unit is rated for up to 15,000 cubic feet so no area in your home is too large for this dehumidifier.

The built-in condenser pump works well and is very handy. Plus, this crawl space dehumidifier with pump is also very compact making it easy to move from place to place.

What We Liked

  • Its compact size
  • The condenser pump
  • The built-in humidistat

What We Didn't Like

  • Quality control issues
  • Noisy motor
94 /100
Our Ratings

alorair hdi90 dehumidifier for crawl space reviews

The two handles help make moving this crawl space dehumidifier into place very easy. Then, you can place this unit in just about any sized room or crawl space measuring up to 2,600 square feet.

You can dry out your crawl space fast as the unit can remove between 90 and 198 pints of moisture per day. It just depends on the settings. Its heavy-duty pump is designed to last long even after giving a hard day’s work every day. Then the coils are epoxy powder coated to help prevent corrosion.

You can forget about crawling to the unit to reset the controls. This dehumidifier comes with remote control features and controller. Also, if you live in a cold climate region, this unit will work at temperatures starting from 35 degrees F.

The hot gas to defrost systems is superb. Plus, the filters fit well and leave no space for moisture to escape. Once in place, it goes about doing its job well and in a more than satisfactory manner.

What We Liked

  • The handles for easy carrying
  • The remote control
  • The large moisture removal capacity

What We Didn't Like

  • It is heavy
  • No drain hose
90 /100
Our Ratings

 Aprilaire E70 Pro 70 Pint Dehumidifier for Crawl Spaces review

You can get up to 70 pints of moisture removed from a room measuring up to 2800 square feet in size. Its included drain hose allows you to drain the dehumidifier directly into a basement drain or sink. You can also direct the removal outside if you want.

The unit is easy to operate. Place the dehumidifier on a level spot, plug it in, then set the humidity levels you want and turn it on. After that, you just forget about it as the unit will operate automatically.

Its coils are made from corrosion resistant aluminum and are designed to last you long time. With easy access to the control panel, you can change the settings any time you want.

This industrial unit can run 24/7 every day without fail. It is also easy to install and can be done by just about any do-it-yourself handyman. The unit takes only a few hours to bring humidity levels down to desired levels.

What We Liked

  • Easy to operate
  • Durable, reliable & long lasting
  • Easy to install

What We Didn't Like

  • Short drain hose
  • Does not work in lower temperatures
  • A little loud
86 /100
Our Ratings

AlorAir Crawl Space Dehumidifier Review

This little unit is designed to remove between 55 and 120 pints of moisture per day. For best results, do not place it in a room measuring larger than 1300 square feet. You will find the control panel on the side of the dehumidifier and all it takes is one finger to set the levels you want.

Feet levelers help you keep the unit level and stable. But just in case, try to place it on a level spot in your crawl space. The anti-corrosion construction material helps keep this unit running and it will work in temperatures as low as 36 degrees F.

A remote control allows you to place this dehumidifier in an inconvenient spot and still give you access to its features and functions. Its digital display makes sure you can understand what setting and levels the unit is operating at.

The company backs its product with great customer service. Most of the time their units work as expected and provide more than the desired results.

What We Liked

  • Great customer service
  • Digital display
  • Remote control

What We Didn't Like

  • Control panel lighting issues
  • Some quality control issues
  • Website language issues
84 /100
Our Ratings

People Also Ask

Can I use a regular dehumidifier in a crawl space?

It's not exactly a black-and-white answer. Standard dehumidifiers aren't precisely designed for the unique challenges that crawl spaces present - typically tighter spots, lower temperatures, and potentially higher humidity levels.

Sure, your everyday dehumidifier might give it a good try but may fall short when it comes to performance. The main concern here isn’t just about effectiveness; it’s also about the unit's longevity. Crawl space conditions can be harsh on devices not built for such environments!

For peace of mind and solid results, investing in a specific crawl space dehumidifier could prove less of a hassle in the long run.

How much should crawl space dehumidifier cost?

Wondering how much a crawl space dehumidifier might set you back?

Well, price tags can vary considerably. Generally, they run anywhere from $800 to $1500, and that’s just upfront costs. Remember there are other factors in play too, like energy usage and maintenance needs which could spike up the overall cost.

Of course, not all dehumidifiers are created equal. While splashing out on a high-end model might sting your wallet initially, these big-ticket items often offer more bang for your buck over time. Think less frequent repairs and lower running costs. So sometimes it pays to think of this as an investment rather than an expense!

How to install dehumidifier in crawl space?

Installing a dehumidifier in your crawl space is a great way to control moisture levels and prevent mold growth. If you want to install a portable dehumidifier in your crawl space, so this is a straightforward process. Let's break down the process into simple steps.

First, you need to choose the right dehumidifier size for your space. You'll want one that's specifically designed for crawl spaces, as these models are built to handle the unique challenges of these areas. Once you've got your dehumidifier, find a spot in your crawl space where it can effectively circulate air throughout the area.

Next, set up your dehumidifier according to the manufacturer's instructions. This usually involves plugging it in and setting the desired humidity level. Some models may also require a drain hose to remove collected water, so make sure this is properly installed and directed towards a suitable drainage point.

Plus, it's always best to consult with a professional if you're about to install a commercial grade or a ducted dehumidifier. Safety should always be your top priority!

Can I leave my dehumidifier running continuously in the crawl space?

Yes, many people do run their dehumidifiers continuously. Just make sure it has an automatic shut-off feature when the tank is full.

Final Thoughts

You may not think that keeping the moisture levels low in your crawl space is important. But if you remember that the crawl space walls and ceiling are connected to the rest of your house, you may see the importance of using a crawl space dehumidifier.

A crawl space dehumidifier will protect portions of your house that you do not even see. This is a plus, as damage to the structure can lower the value of your house if you decide to sell it.

Protect your home with one of the top 5 crawl space dehumidifiers and maintain the value of your home. It is a smart move to make.

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