The crawl spaces under our houses can be affected by many problems relating to poor air quality. The biggest problem usually being high humidity due to poor ventilation. It is this problem which leads people to buy the best crawl space dehumidifier they can.
High humidity in your home’s crawl space can lead to many unpleasant issues, such as mold problems, pest invasions, structural damage, bad odors, allergy triggers and more. Fixing basement crawl space moisture problems with the use of a crawl space dehumidifier is one of the most important things every home owner should do.
Enclosing your crawl space 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 enclose this area (crawl space encapsulation), you still need to reduce humidity and improve 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.
AlorAir Sentinel HD55
Perfect for small to medium sized crawl spaces.
Santa Fe Compact70
Perfect for small to large sized crawl spaces.
Top Rated Crawl Space Dehumidifier Reviews
AlorAir Sentinel HD55 Dehumidifier
Best for medium sized crawl spaces
AlorAir Sentinel HDi90 Dehumidifier
Best for large crawl spaces
Sante Fe Compact70 Dehumidifier
Dri Eaz F515 PHD 200 Compact
Dri Eaz F413 Revolution LGR
Ivation 70 Pint Dehumidifier
Non heavy duty option
Buying the Best Dehumidifier for Crawl Space
So, how does one go about dehumidifying their wet crawl space? There are loads 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 a crawl space different from others? There are several things to consider:
The noise levels of the type of dehumidifier you would install underneath your home isn't as important as the noise output of smaller models. That doesn’t mean that you should buy a model that sounds like a freight train – you don’t want to hear it inside your home – but you don’t need to focus too much on your dehumidifier’s noise level.
Your dehumidifier needs to be powerful enough to dehumidify the entire crawl space. These areas are usually large as they cover the footprint of your entire home. Their square footage is significant, but they are also not as tall as a room. You should measure the volume of the space beneath your home and decide on a dehumidifier 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.
Power is one thing, but your dehumidifier’s efficiency is equally important. Dehumidifiers for crawl spaces are designed to work for long durations, so you want it to be as energy efficient as possible as it works to remove excess moisture.
Crawlspace dehumidifiers need an efficient continuous drainage system. If you were just buying a dehumidifier for your kitchen, then using the onboard water bucket would be fine. But you 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 dehumidifier that has a continuous drainage system.
Low Temperature Operation
The appliance needs to work at low temperatures and have an auto defrost function. The auto defrost system prevents the internals of the machine from forming frost and working at low temperatures is something that is often required in a basement and crawl space.
An auto reset function is also important for this type of dehumidification appliance. This function restarts the device after a power outage, keeping all of its original settings. This is great, since even if you are home, it saves you an unnecessary trip down into your crawl space.
So, which are our top 5 picks for the best crawl space dehumidifiers on the market right now? We have listed them below, so choose the one most suited to your needs. We hope our crawl space dehumidifier reviews at least give you a good starting point for what you are looking for, if not a final decision on the best dehumidifier for your crawl space.
Looking for the best commercial dehumidifier? Take a look at our recommendations.
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 too – as it can also perform well in a warehouse, an office 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 and corrosion, which are so easy to form and develop in a non vented crawl space.
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.
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.
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.
If you have a big enough garage, the Dri-Eaz PHD 200 would also make a great dehumidifier for garages as its well suited to continuous operation.
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.
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 recommend 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 also the type of dehumidifier that can be used in an apartment.
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.
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 lot 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?
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.
Crawl Space 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.
Crawl Space 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
- AlorAir Sentinel HD55 - Best Value for Money
- AlorAir Sentinel HDi90 - Best Overall
- Santa Fe Compact70 - Best Alternative
- Dri-Eaz F515 PHD 200
- Dri-Eaz F413 Revolution
- 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.