Best Crawl Space Dehumidifiers – 2021 Top Picks

| Last Updated: August 5, 2021

Unlike a basement, a crawl space is not a place to utilize for living and therefore often goes unnoticed by homeowners.

However, for good air conditioning and maintenance of the crawl space in hot and humid areas, dehumidifiers for a crawl space can be extremely important. These ensure that there is no excessive moisture, which can lead to several problems such as wet patches on your walls and ceilings. 

To help you clear out moisture from your crawl space, we’ve picked out the best crawl space dehumidifiers available on the market. We invite you to use this informational guide as a starting point for your search.

Comparison of the Best Crawl Space Dehumidifiers

  • Comes with a lifetime warranty
  • Best overall crawl space dehumidifier
  • Touchpad screen for temperature control
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  • Epoxy coated built
  • Covers an area of 1300 square feet
  • Runner up crawl space dehumidifier from our list
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  • Has epoxy coated coils
  • Covers an area of 2600 square feet
  • Best dehumidifier with pump from our list
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  • Has a built-in humidistat
  • Best commercial crawl space dehumidifier
  • Comes with a protective polyethylene frame
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  • LED controls
  • Smallest crawl space dehumidifier from our list
  • It has a capacity of covering an area of 3000 square feet.
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  • Best Aprilaire Crawl Space Dehumidifier
  • Removes 70 pints of moisture in up to 2,800 sq. ft.
  • Aluminum coils are corrosion-resistant and strong
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  • Maintains 45 - 55% humidity in rooms up to 1,300 sq. ft.
  • Operates at a whisper quiet level of 52 dB
  • 5 year warranty on unit, lifetime tech support
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Aspects to Consider Before Buying a Dehumidifier for a Crawl Space

Before we go ahead and review our top picks, there are some important aspects that you must consider before making your purchase. These aspects include the area coverage, weight and dimensions, extra features and bonuses, and noise production. These are some important aspects that have a direct impact on the overall performance and experience of any crawl space dehumidifier.

AlorAir Crawl Space Dehumidifier 120 PPD

Coverage Area

This refers to the capacity of the dehumidifier regarding how much area it can serve. The larger the crawl space, the larger coverage area the dehumidifier needs. The coverage capacity of the dehumidifier is also linked to how humid the area is. Moreover, in a sealed crawl space, a dehumidifier will cover a larger area.

Weight and Dimensions

While weight and dimensions may not directly impact its performance, it does impact your overall convenience and comfort. An unnecessarily heavy dehumidifier will take more effort to fit properly in your crawl space, and it will also be inconvenient to move around.

Extra Features

Extra features enhance the performance of the dehumidifier as well as make your experience even more convenient. Such features include a corrosion-resistant build and controls that are easy to read and operate.

Some dehumidifiers also come with multi-functional features such as 2-in-1 dehumidifying and heating systems for both winters and summers.

Review of the Best Dehumidifiers for a Crawl Space

We have reviewed 6 of the best crawl space dehumidifiers. The market is packed with versatile and varying options for you to choose from, which can make it confusing and overwhelming to pick just one. These in-depth reviews aim to help you in finding and choosing the most appropriate and suitable dehumidifier for a crawl space in your home.

Best Overall

Dri-Eaz Revolution LGR Dehumidifier

Dri-Eaz Revolution LGR Commercial Dehumidifier with Pump, Industrial, Compact, Crawlspace and Basement Drying, Durable, Portable, Blue, F413, Up to 17 Gallon Water Removal per Day


Dimensions: 12.5×21.5×12.5″

Weight: 65.0 lbs.

Decibel Level: 55 dB

Capacity: 134 Pints

(Max. Water Removal / Day)

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The Dri-Eaz dehumidifier is a refrigerants’ dehumidifier that is known for its powerful functionality. It features a capacity of serving an area of 7000 square feet, absorbing 80 pints of moisture every day. These features make it an exceptional dehumidifier for a hotter or humid area.

Another distinctive feature of this unit is its easy-to-read and easy-to-access temperature display, which makes temperature control even easier. It has a display LED screen on the top. It is also equipped with a built-in humidistat. The touch display makes controlling and regulating the temperature an extremely quick and easy task. The best part about this powerful dehumidifier is that even with such extraordinary functions and features, it still comes in a compact size that fits any small space. It weighs about 50 pounds.

It also comes with a built-in automatic pump out functionality that makes maintenance easier. It is backed by a lifetime warranty from the manufacturer, which ensures that your investment is in the right place.

Bottom Line

Overall, the Dri-Eaz is the most reliable and overall the best dehumidifier for crawl spaces. This unit is packed with versatile features and functionality that contribute to its high power and efficient performance. However, if you’re on a much smaller budget or only have a small area to cover, then you might want to explore some other options.


Compact yet extremely powerful unit that can fit in every space

High performing dehumidifier with high-end extra features, such as the touchpad screen

Lifetime warranty given by the manufacturer gives you a secure and comfortable user experience


There have been complains about leakage

Can be expensive and for those on a budget


AlorAir Crawl Space Dehumidifier 120 PPD

ALORAIR Basement/Crawl Space Dehumidifiers Removal 120 PPD (Saturation), 55 Pint Commercial Dehumidifier, Energy Star Listed, 5 Years Warranty, Auto Defrosting, cETL, Optional Remote Monitoring


Dimensions: 11.8×17.7×11.8″

Weight: 57.2 lbs.

Decibel Level: 52 dB

Capacity: 120 Pints

(Max. Water Removal / Day)

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The AloAir crawl space dehumidifier puts up good competition to many higher end dehumidifiers that are well-performing yet expensive. This dehumidifier is also of equally high quality, yet comes at a rather pocket-friendly price. It has the capacity to cover an area of up to 1300 square feet, extracting 55 pints of moisture every day. It is also functional at temperatures as low as 36 degrees Fahrenheit.

Its durable build is one of its most prominent features since it is coated with epoxy, making it resistant to corrosions and ensuring a long lasting life. It has internal coils coated with stainless steel as well.

Dehumidifiers are exposed to oxidation and extreme moisture conditions, which is why this dehumidifier qualifies as the runner up; its design is extremely durable and well-thought out.

This dehumidifier also does not lack for convenience and comfort thanks to its quick and efficient remote controlled functioning. It has an automatic shutoff functionality after a 24-hour cycle. Moreover, the dehumidifier is also very easy to clean and maintain with its easy-to-remove and slide G3 filter.

Bottom Line

To sum it up, the AloAir crawl space dehumidifier is a good option if you are looking for something powerful and high-quality yet easy on the pocket. However, it may not last you a long as other higher-end powerful models. It features all the essentials and some extra features like timer functionality as well, which make it a solid package at an affordable rate.


Features a timer function that makes it easier to manage

Built with anti-corrosion material that ensures prevention from leakage issues

Budget-friendly option that comes with all the higher end features

Capacity to cover a large area of 1300 square inches along with good extraction capacity of daily moisture


May not extract as much water as it promises

Best with Pump

AlorAir Crawlspace Dehumidifier 198 PPD

ALORAIR Basement/Crawlspace Dehumidifiers 198 PPD (Saturation), 90 Pints (AHAM), 5 Years Warranty, Condensate Pump, Auto Defrosting, Rare Earth Alloy Tube Evaporator, Remote Control (optional)


Dimensions: 24.8×13.8×15.8″

Weight: 57.2 lbs.

Decibel Level: <58 dBA

Capacity: 198 Pints

(Max. Water Removal / Day)

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The AlorAir Sentinel HDi90 dehumidifier is designed specifically for use in basements and crawl spaces. This powerful dehumidifier is equipped with a built-in draining pump and has a capacity covering an area of up to 2600 square feet. It can extract 95 pints of moisture per day. It is a strong and sturdily built unit; not only does it boast corrosion resistant technology, it is also portable and convenient to move around on its four wheels.

It has a low sound production even when operating at high power. Furthermore, it is easy to install, use, and maintain with its quick and efficient connect plugs and 20-inch high pump.

The dehumidifier is also easy to operate with its remote control technology, which makes temperature control and regulation an easy job and requires minimum expertise. Furthermore, it also features epoxy coated coils and body, which ensure durability and long lasting life.

Bottom Line

Overall, the AlorAir Sentinel HDi90 is a great choice to cover a large area with high humidity levels. Moreover, it has a huge capacity and coverage area with features that ensure portability and easy installation. Bear in mind that it is a bit pricier than other equally efficient models. It is a good option if you have a larger budget, although you can find similar features in other more affordable models.


Extraction power of 95 pints moisture per day

Powerful yet compact design that fits anywhere

Remote control system allows ease and convenience

Invest with confidence in this corrosion-resistant dehumidifier

Highly recommended for rooms and areas that are large, up to the size of 2600 square feet


More expensive than other models

Best Commercial Model

Dri-Eaz PHD 200 Dehumidifier with Pump

Dri-Eaz PHD 200 Commercial Dehumidifier with Pump, Crawl Space and Basement Drying, F515, Up to 16 Gallon Water Removal per Day, Gray


Dimensions: 12.5×12.5×17.6″

Weight: 63.2 lbs.

Decibel Level: 60 dB

Capacity: 128 Pints

(Max. Water Removal / Day)

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The Dri-Eaz PHD 200 is a commercial dehumidifier that comes with an extraordinary capacity of extracting 134 pints of moisture per day. Its body is housed by a polythene cover that protects it from exposure to moisture, which can lead to rust and corrosion.

Moreover, this commercial dehumidifier features an LED display that ensures highly visible controls even in darker places. This feature makes it extremely convenient to use and operate. The unit drains out moisture and water outside automatically through the pump.

Another prominent feature about this product is the lifetime warranty that comes with its polythene frame, while its parts have a 6 year limited warranty. This will ensure that your investment is in the right place.

Bottom Line

If there’s a large space you need to cover or have a crawlspace in an extremely humid region, then this powerful commercial dehumidifier is the right choice for you. Its high price may be a deal breaker considering that there are similar efficient models in the market. However, its powerful performance and large capacity to extract 134 pints of moisture are commendable.


Features a mesh air filter to ensure cleaner air

Extra features include LED display, automatic pump, and humidistat

Capable of operating efficiently in larger spaces and commercial use as well

Powerful, durable, and sturdy dehumidifier that can be used to extract 134 pints of moisture


Large price tag

There have been complaints about leakages

Smallest Model

TOSOT 30 Pint Dehumidifier

TOSOT 20 Pint 1,500 Sq Ft Dehumidifier Energy Star - for Home, Basement, Bedroom or Bathroom - Super Quiet (Previous 30 Pint)


Dimensions: 15.0×11.7×20.7″

Weight: 32.0 lbs.

Decibel Level: 48 dB

Capacity: 20 Pints

(Max. Water Removal / Day)

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If you have a small area to cover or have a house in a less humid or hot area, then this TOSOT 30-pint dehumidifier will do the job for you. It features a water tank with a capacity of 2 gallons. This small, budget-friendly yet efficient model can cover an area of 3000 square feet, which shows that its size and price should not make you underestimate its performance.

It comes with a 1-year limited warranty, produces a sound output of no more than 52 dB, and has extremely convenient LED controls. The LED controls ensure easy operation and require very little experience.

Moreover, the dehumidifier is also extremely reliable with its Energy Star certification. The certification ensures that it will be energy efficient and easier on your utility bills. Consider whether a budget-friendly, smaller sized model that will also ensure long-term efficiency is just what you need to control and regulate moisture levels in your home.

Bottom Line

This TOSOT dehumidifier comes with everything ranging from portability, sleek design, and large area coverage to affordability. It is an all-in-one package that you should consider buying if you are looking for an easy-to-operate dehumidifier. However, for commercial use or for use in highly humid regions, we may not recommend this.


Small size also increases portability

Small-sized yet equally efficient model

Operations are very quiet compared to other models

Features a water tank with a good capacity of 2 gallons

LED controls of the dehumidifier will make it extremely comfortable to operate


Does not have a pump

Not recommended for larger spaces

Best Aprilaire Crawl Space Dehumidifier

Aprilaire 1820 Pro

Aprilaire 1820 Pro Dehumidifier, 70 Pint Commercial Dehumidifier for Crawl Spaces, Basements, Whole Homes up to 2,800 sq. ft.


Dimensions: 27.5×12.5×14.5″

Weight: 70 lbs.

Decibel Level: N/A

Capacity: 95 Pints

(Max. Water Removal / Day)

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What Recent Buyers Report

Customers laud this unit’s high capacity and impressive performance level. It’s also noted for running continuously without issue and dragging the humidity level down by effectively removing excess moisture.

Why it Stands Out to Us

Out of all the products in Aprilaire’s catalog, this device was made to effectively combat crawl space humidity. Its square foot coverage area, high capacity, and durability blew us away. You can also upgrade from a coverage area of 2,800 square feet to 7,200 to dehumidify the entire home. Likewise, you can upsize the dehumidifier from 70 pints to 130.

Bottom Line

This is Aprilaire’s best crawl space dehumidifier. It covers a huge area, has a very high capacity for removing excess humidity, and is incredibly hardy.



Durable design

Huge coverage area

Large storage capacity

Continuous pump cycle


Fan is somewhat loud

Warranty could be better

Editor’s Pick

BaseAire AirWerx55

BaseAire AirWerx55 Energy Star Dehumidifier for Crawl Space Basement, 120 Pints Commercial Dehumidifier with Continuous Drain Hose, 5 Years Warranty, Intelligent Humidity Control, Auto Shut off/Restart


Dimensions: 19.2×13.3×12.2″

Weight: 59.5 lbs.

Decibel Level: 52 dB

Capacity: 120 Pints

(Max. Water Removal / Day)

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What Recent Buyers Report

This dehumidifier is known for being effective, quiet, and working continuously to improve the area’s moisture level. It’s also easy to set up.

Why it Stands Out to Us

We were instantly taken by this dehumidifier’s 120-pint capacity, which is enough to take care of even the most humid crawl spaces. We were also impressed by this unit’s size, which is small enough to fit into nearly any crawl space. 

Additional features include a power outage control system, which allows the device to restart automatically if your home loses power, and an auto-defrost system that allows it to manage its own temperature.

Bottom Line

This crawl space dehumidifier is compact, user-friendly, and filled with great features. It can reduce the crawl space humidity with little supervision or maintenance. This is a great option if you’re looking for a simple unit.


Quiet unit

High capacity

Simple to use

Auto-defrost system

Power outage control system


Relatively poor build

Covers only 1,400 sq ft.

Keystone 95 Pt. Dehumidifier with Built-in Pump

Keystone 95 Pint Dehumidifier with Built In Pump KSTAD957PA (Renewed)


Dimensions: 18.8×14.2×24.6″

Weight: 60.6 lbs.

Decibel Level: N/A

Capacity: 95 Pints

(Max. Water Removal / Day)

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What makes this Keystone dehumidifier unique is that it features upward water extraction functionality. It also comes with a water collection tank with a capacity of 2.6 gallons and can cover up to 6000 square feet, along with the ability to extract 95 pints of moisture every day.

It is also equipped with extra features that ensure comfort and convenience, such as timer functionality and auto shutoff, as well as an alarm functionality that alerts you when the tank is full. This ensures prevention of water leakage and a hassle-free experience for you. The water tank is also transparent and has a level indicator for greater control and easy use.

Another feature of this Keystone unit that contributes to its usefulness is its electric control system. It has a digital LED display that can be used for temperature control purposes.

If you live in a region where there’s extreme moisture and a large area to cover, then this Keystone dehumidifier will work perfectly for you. Moreover, there’s no hassle of turning it on again in cases of power outages since it restarts automatically.

Bottom Line

In short, this Keystone dehumidifier is packed with all the features and functionality necessary to ensure a positive user experience. Other than its size and weight, everything about this unit makes it seem like a good one to invest in it. It is also very reasonably priced, considering its functionality and performance.


Has the capacity to cover a large space

Restarts automatically in the event of a power outage

High-end extra features like timer functionality and alarm alerts

Intelligent design that ensures a mess-free hassle-free experience


Unit is quite heavy and has larger dimensions than competitor models

Why Would a Crawl Space Need a Dehumidifier?

Dehumidifiers regulate moisture levels and the condition of the air in your home. Excessive moisture can be problematic for a number of reasons, including damage to property, an unhealthy living environment, and buildup of bacteria. Here are some reasons for having a crawl space dehumidifier:

Pest Protection

Excess humidity leads to pest infestation, which can devalue your property and can also lead to several health issues. A dehumidifier will ensure protection from pests by controlling and regulating the moisture levels in the crawl space.

Dri-Eaz Revolution LGR Dehumidifier

Hot and Humid Areas

If your house is in a hot region, then you are likely to have air conditioners installed and used frequently. This makes the air condensed in the crawl space, leading to high levels of moisture. A dehumidifier can help regulate the air in such humid and hot regions, making your life worry-free.

Healthier Living Environment

By preventing pests and buildup of condensed air in the crawl space, you will be maintaining a healthier environment in your home. Extra moisture in the air can lead to respiratory issues, build bacteria and mold, and can also cause allergic reactions. A dehumidifier can help prevent all of that.

What Makes a Dehumidifier Great for a Crawl Space?

Different dehumidifiers are designed for different tasks. While you need a quiet and compact device for a bedroom to allow yourself to sleep, a crawl space requires something a little more rugged.

A crawl space is the perfect breeding ground for insects, mold spores, and rot. A dehumidifier will help reduce the growth or presence of these unwanted pests to let you safely store things in your crawl space and prevent damage to your home. Here’s what you’ll need to ensure an effective crawl space dehumidification process.

Capacity and Coverage

A high capacity for moisture reduction and storage is essential for a humid crawl space.

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Temperature Range

Your dehumidifier will also need a wide temperature range to handle high and low temperatures in a crawl space. For example, inside models may not work below a certain temperature.


A durable dehumidifier will ensure your device can handle wide temperature changes, bad weather, and dirt.

What Purpose Does a Crawl Space Dehumidifier Serve?

Crawl space dehumidifiers, like standard dehumidifiers, serve to reduce excess moisture as much as possible. They circulate air with a fan, draw in moisture, store it, and expel dry air.

In addition to a dehumidifier’s standard benefits, a crawl space dehumidifier will:

Prevent Mold

Reducing the moisture level in the air will reduce the risk of mold growth in your crawl space, protecting any storage items.

Prevent Rot

Reducing humidity will also stop wooden beams and supports from rotting over time. A damp crawl space is a structural danger.

Discourage Insects

There’s nothing that insects love more than dark, damp spaces. Reducing moisture levels in your crawl space will discourage insects from settling in.

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What Size Dehumidifier For a Crawl Space?

The size of the dehumidifier you need depends upon the device’s square foot-coverage area and bucket capacity. You’ll likely need a high-capacity unit or drainage hose for a very humid space. Additionally, the dehumidifier’s coverage area should be equivalent to, or larger than, the size of your crawl space.

How to Choose a Crawl Space Dehumidifier

Your crawl space will present problems specific to that area, such as mold, rot, and pests. These issues require a different dehumidifier from a device you’d use in your bedroom or living room. Therefore, you need to consider various factors when choosing a crawl space dehumidifier.

Discharge Method

An attached discharge hose will ensure that runoff is passed safely into a tank or away from your home while the dehumidifier runs continuously. Check what the discharge options are for different models.

Coverage Area

Measure your crawl space to see what coverage level you need and determine which dehumidifiers can handle the job.


Verify what temperature range your dehumidifier can handle. Many are unable to work in extreme cold or heat. However, crawl space dehumidifiers generally have a better temperature than standard devices.

Crawl Space Dehumidifier Comparisons

There are several popular ways to control the air quality and humidity level of a residential crawl space, including fans, air induction, and ventilation systems. We put these systems head-to-head with dehumidifiers to determine the best options available:

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Crawl Space Fan vs Dehumidifier

A crawl space fan will improve air circulation, prevent stagnant air buildup, and control the temperature. But it won’t lower the moisture level. A dehumidifier is far better at removing humidity from the air and preventing rot or mold.

Crawl Space Air Induction vs Dehumidifier

An air induction system will pull outside air into the crawl space, allowing for better circulation. These often include a backflow damper to prevent unwanted air. While these systems can improve circulation and remove stagnant air, they’re not a fix-all solution. You’ll need a more efficient and sophisticated system to resolve humidity issues.

Basement Ventilation vs Dehumidifier

A basement ventilation system isn’t suited for a crawl space, as it relies upon air circulation. These systems don’t remove moisture from the air, they only introduce fresh air and circulate unwanted air out.

Types of Dehumidifiers Suited for Crawl Spaces

There’s more than just one kind of dehumidifiers that you can install in a crawl space. The type of dehumidifier you choose to install will depend on how you plan on using the appliance. Here are some commonly found types of dehumidifiers currently on the market:

Refrigerant Dehumidifiers

These are the most common variety. They work by running moist air through cold evaporator coils, causing condensation and collecting the vapors from the air. The dry air is released back into the environment.

Bucket Based Dehumidifiers

Such dehumidifiers collect moisture and water and drain it out into an attached bucket. They require you to clean out the bucket by yourself.

Gravitational Force Dehumidifiers

These dehumidifiers work vertically, depending on gravity to push down the collected water through a hose to a drain. These require minimum supervision and manual control.

Built-in Drain Pump

These dehumidifiers come with a hose and pump, allowing them to drain water upwards and sideways. They allow you to drain moisture and then push along the hose till the drain if the drain is at a distance. These are more expensive, higher-end models.

AlorAir Crawlspace Dehumidifier 198 PPD

Crawl Space Dehumidifier Installation

You can install a dehumidifier yourself. It’ll save you a lot of money, it requires little effort, and it’s also a fulfilling and rewarding experience.

The installation instructions provided by the manufacturer will apply to the specific unit you have, but these devices are installed similarly. We’ve outlined the typical steps to installing a hanging unit:

  1. Unbox the product and lay out all the parts

  2. Attach a light to your crawl space

  3. Measure the crawl space

  4. Measure the beams in your crawl space

  5. Attach the brackets to the beams in your crawlspace

  6. Tighten the bolts with a wrench or drill

  7. Attach the hanger for your dehumidifier to the brackets. This will be according to instructions included by the manufacturer

  8. Plug the dehumidifier in and attach it to the hanger on the brackets

  9. Tighten the bolts with a wrench or drill

  10. Test the unit

For a full breakdown of the process, refer to the YouTube video below:


To wrap it up, we can say that the most important factors that will impact your final decision are your personal preferences and how you plan on using the dehumidifier. Depending on the size of the room and the humidity level, the performance of the unit will also be impacted.

There are several high quality units on the market that are available at budget-friendly prices, so you should explore and go through your choices thoroughly before investing in an unreliable unit. Warranty, area coverage, and leakage protection features are some important considerations.

People Also Ask

Here are our answers to the most commonly asked questions asked about crawl space dehumidifiers:

How Much Energy Do Crawl Space Dehumidifiers Use?

It varies depending on the model in question. You can expect a dehumidifier to consume about 280 watts per hour, which could increase if your dehumidifier is particularly powerful. Likewise, less powerful models will often consume less energy.

How Long Will It Take For a Crawl Space Dehumidifier to Reduce Humidity?

It depends on a variety of factors, including the dehumidifier’s capabilities, the room’s humidity level, and the area’s degree of containment. Reducing humidity to an optimal level shouldn’t take long in the average space.

Where is the Best Place to Put The Dehumidifier in a Crawl Space?

It’s always best to place it on a flat and stable surface. This area should also be the most humid part of the room. Additionally, ensure the device is away from any materials that could block the exhaust or intake, as well as windows or open doors.

What Makes Crawl Space Dehumidifiers So Costly?

Crawl space dehumidifiers tend to be more compact than their full-sized cousins as they need to fit into small areas while maintaining a significant amount of power. They’re also often industrial grade and usually last much longer.

What Is the Normal Setting on a Dehumidifier in a Crawl Space?

It depends on the issue you have in your crawl space. You’ll likely need to put your dehumidifier on a continuous or automatic setting if your crawl space consistently collects a lot of moisture.

Can I Use a Regular Dehumidifier in a Crawl Space?

Yes, but different dehumidifiers are more ideal for different tasks. Therefore, a crawl space dehumidifier will likely be the best thing to use in a crawl space. Other types or models may not be as effective.

My name is Bob Wells and I am a retired HVAC tech from Washington state. I am currently retired and no longer do much with HVAC, however, I feel like I have a lot of knowledge in the subject and I wanted to create a website where I could talk about what I've learned and help upcoming HVAC techs. Find more info about me and HVAC Training 101.