Last Updated: August 31, 2024
A crawl space dehumidifier is ideal for controlling humidity in your crawl space and preventing excess moisture from entering the main living area.
Have you ever walked by an air vent in your house and noticed an unpleasant smell? It could be related to a high amount of moisture in your crawl space. A crawl space enables easy air circulation in the house and provides easy access to plumbing and electrical components. Crawl spaces generally don’t have sufficient ventilation and can get very humid and damp in certain climates, making it vulnerable to mold and mildew growth, pest infestations, and structural damage to the house and significant health problems.
The airborne spores and allergens from your crawl space can spread throughout your home as well, spreading the infestation through the ventilation system. A crawl space dehumidifier is ideal for controlling humidity in your crawl space and preventing excess moisture from entering the main living area.
Why do you specifically need a crawl space dehumidifier?
Crawl space dehumidifiers are designed for heavy-duty use and are often built using a steel chassis or durable plastic housing. They are constructed distinctively from standard dehumidifiers due to space constraints, and often have compact or flatter build configurations since crawl spaces can have low clearances. Their build also ensures easy installation and accessibility if you need to change their settings. These devices come with the low-temperature operation, and automatic defrost systems to provide efficient dehumidification in adverse conditions.
Crawl space dehumidifiers are capable of operating efficiently in harsh weather conditions. They are equipped with powerful FM fans, which can pull a higher volume of air into the dehumidifier, allowing higher moisture removal rates and a greater coverage area.
Things to Consider While Buying a Crawl Space Dehumidifier
A dehumidifier designed for crawl spaces isn’t necessarily cheap. Before purchasing the device, carefully go through the crawl space condition. Ductwork and a few spider webs are common, but there may be more critical issues right under your feet.
Does the crawl space is covered in plastic or bare flooring? You may need to consider any repairs to the crawl space or upgrades before investing in a dehumidifier. You may also need to make a few adjustments in the crawlspace to accommodate the dehumidifier.
Features in a Crawl Space Dehumidifier to look for
Coverage area – The coverage area refers to the amount of site the device can cover effectively—the larger the crawl space, the more extensive coverage area the dehumidifier needs.
ACH – The humidity level in a room and the square footage of the area determines the number of times the air must cycle through the dehumidifier in an hour and is denoted as air changes per hour (ACH)
Integral condensate pump – the pump pushes the collected water automatically through a hose. The pump can operate vertically or horizontally and automatically start the process once the water reaches a certain level.
Dimensions and weight – Size can be a significant hurdle while installing a crawl space dehumidifier. Since crawl spaces have a lower standing area, you need to consider the measurements before purchasing one. You certainly don’t want to choose one that is either not going to fit into your space at all or be too cumbersome to get in place once you have it inside your crawl space.
Warranty – A Dehumidifier is a crucial investment, and it is essential to protect the investment by ensuring that the product comes with an extended warranty period. You also need to ensure to read the fine print very carefully, since some companies claim to offer an extended guarantee, but will only cover certain parts instead of the whole machine.
Drainage – Since the crawlspace dehumidifiers need to run for long hours and absorb a high amount of moisture, they need an efficient continuous drainage system to discharge this captured water efficiently. You may not want to make multiple trips downstairs to empty a bucket.
Auto-Defrost – Auto defrosts systems prevent the machine’s inner workings from building up frost, and working at low temperatures is often required in a basement and crawl space. Auto defrost shuts down the compressor when it detects frost build-up. The fan continues working to help in melting the ice. The unit resumes operation automatically once the ice melts. If you live in a colder climate, it’s a critical feature as it can get chilly below your subfloor.
Auto Restarts – It automatically restarts a dehumidifier in the event of a power outage. It comes handy when you need round the clock dehumidification, and nobody is in the office or plant.
Energy Efficiency – Crawl space dehumidifiers are designed to work for continuous usage; hence it is essential to note the amount of power they consume so that the energy bill does not burn a hole in your pocket.
Noise Level – On average, crawl space dehumidifiers generate source around 50 decibels. Higher than this can become disruptive and irritating. It will help if you read the appliance’s decibel level specs and test before making a purchase.
Best Dehumidifiers For a Crawl Space (With Reviews)
1. AlorAir Basement/Crawlspace Dehumidifier
The ALorAIR professional dehumidifier is specially designed for high moisture places such as crawl space. The dehumidifier has a drainage capacity of 90 pints per day (PPD)at AHAM and 198 PPD at saturation. The device boasts a coefficient of performance (COP) of 2.69L/Kwh and can deliver Airflow up to 210 CFM and reach areas up to 2600 sq. feet.
The ALorAIR crawlspace is manufactured from stainless steel side plates and coated coils. The unit comes with a waterproof base while a rubber strip seals the circuit board. The dehumidifier is equipped with a durable condensate pump as well as a bypass air sensor. The condensate pump comes with a 14.7′ lifting distance, giving you the option to drain it anywhere. Furthermore, all cables on the condensate pump have quick-connect plugs, making it easier to install and maintain.
The ALORAIR crawlspace dehumidifier boasts industry-leading epoxy coated coils that render protection against corrosive environments and maintain its heat transferability, thereby extending the coils’ life. The device also features rare earth alloy Tube Evaporator to avoid Freon leakage, a fatal flaw for a dehumidifier. This innovative feature extends the coils’ life by providing protection against, maintaining the coil’s heat transferability.
The ALorAIR dehumidifier is equipped with a “Hot Gas” defrosting system, which ensures a quick and efficient clearing of ice from the coil allowing the dehumidifier to work efficiently under temperatures as low as 35 degrees Fahrenheit. The device comes with a remote monitoring function (need to purchase separately), making it easier for places where remote sensing and controlling are required. The dehumidifier also includes a MERV 8 filter placed at the inlet of the device, keeping it free from dirt and dust particles, aiding in low maintenance. ALORAIR is offering a five-year warranty on the device.
Pros
- Remote capability
- Usable in frigid temperatures
- Epoxy coated coils
- Hot Gas Defrosting System
- Long Warranty
- Premium Materials
Cons
- Heavier than other similarly designed dehumidifiers
- No auto-restart option
- Expensive
Why buy: The ALorAIR professional dehumidifier offers a waterproof design and high drainage capacity. It is easy to operate and can work at low temperatures, and boasts a host of extra features.
2. Dri-Eaz F413 Revolution LGR Dehumidifier
The Dri-EAZ F413 can remove up to 80 pints of moisture per day at AHAM and 139 pints water at 90°F/90% saturation. The commercial dehumidifier delivers airflow of 180 CFM.
Boasting state-of-the-art LGR technology, the compact Dri-EAZ F413 can remove moisture as well as any full-size dehumidifier and easily fit into tight spaces. The dehumidifier comes with rugged rotomolded housing, and its low grain performance is optimized to work seamlessly in harsh environments. Weighing 65 lbs, the Dri-EAZ F413 features firm rubber grip handles that evenly balance the dehumidifier’s weight. The commercial dehumidifier does not include a water tank. Still, it consists of a 40 ft. drain hose with a quick-connect fitting that can pump water out vertically at least 20 ft., thereby allowing you to drain the water from a specific location.
The Revolution LGR comes with an auto-restart feature that ensures that the device will start automatically in case of a power outage, enabling round the clock support in case of a power outage. The device also features a 25. ft detachable power cord and a reusable four-stage filter. The Dri-EAZ F413 comes with an easy to read LED display unit that displays real-time Inlet, outlet temperature, and relative humidity levels, thereby allowing you to monitor the dehumidification progress and the job site condition.
The Revolution LGR also features a humidistat that will enable you to decide the humidity level and automatically kicks in when the moisture level goes beyond that range. The intelligent dehumidifier can assess whether the motor should operate at full throttle or lower speed, and dynamically adjusts the motor speed without human intervention.
The Dri-EAZ F413 can operate efficiently between 33°F to 100°F; however, it is not built for low-temperature operation, and the coils might freeze up in extreme temperatures. The device comes with a one-year manufacture warranty covering parts and labor. Furthermore, the Company provides a six-year warranty on the compressor and coils and a limited lifetime warranty on the polyethylene housing.
Pros
- Heavy-duty dehumidifier
- Portable and compact
- Easy to use and maintain
Cons
- Expensive
- No hot air exhausts
- No protected coils
Why Buy: The Dri-EAZ F413 is competent in removing humidity and keeping moisture in control. While the device is slightly on the pricier side, if you want a dependable tool in a small size that can perform as good as full-fledged humidifiers, then the LGR Revolution is worth considering.
3. BaseAire Basement Dehumidifier AirWerx90X
BaseAire Basement Dehumidifier AirWerx90X- The BaseAire Crawl Space & Basement dehumidifier AirWerx90X is built with a revolutionary horizontal design with uniquely placed airflow outlets to generate air circulation in tight spaces. The device is capable of removing 90 pints of moisture at AHAM and 198 PPD at saturation with the energy efficiency of 2.88L/Kwh. The AirWerx90X can process air at up to 210 CFM and cover an area up to 2,600 sq. ft.
The BaseAire AirWerx90X is equipped with durably coated coils with the stainless side plate and features a metallic sheet housing to protect the internal part from any impact damages. The device comes with a built-in condensate pump, with a 14.7’ lifting distance, giving you the freedom to drain anywhere. The BaseAire AirWerx90X also features memory starting with digital humidity readout and is equipped with a Duct option.
AirWerx90X Basement dehumidifier is designed with the remote monitoring function. Weighing 81 pounds, the dehumidifier generates less than 58 dBA of sound and can operate efficiently in the range of 33.8℉ to 104℉. The BaseAire AirWerx90X is ETL listed and comes with a five years warranty.
Pros
- High Capacity
- Low Sound
- High Warranty
- Efficient Coverage
Cons
- Heavy
Why Buy: The compact BaseAire AirWerx90X crawl space dehumidifier combines heavy-duty performance with advanced features and is an excellent choice for tight spaces.
4. Aprilaire 1820 Pro Dehumidifier, 70 Pint Commercial Dehumidifier for Crawl Spaces
The Aprilaire 1820 dehumidifier is the perfect solution for controlling moisture in sealed crawl spaces protecting against structural damage, pests, and mold. The device has a 200 CFM capacity, is capable of removing up to 70 pints of water per day, and can easily cover areas up to 2800 sq. ft.
Designed and manufactured in the U. S., the Aprilaire 1820 dehumidifier is built with corrosion-resistant aluminum coils to prevent leaks and comes with robust packaging for damage-free shipment. The compact size of the device (12.5″ x 12.5″ x 25”) makes it an ideal fit for crawl space doors and between joists and tight spaces.
The Aprilaire 1820 dehumidifier features a control panel mounted on the unit’s front, making it easy to access in any location. The dehumidifier comes with an easy to use interactive display. The Aprilaire 1820 is low maintenance with no messy trays to empty, and simple once a year filter cleaning or replacement. The crawl space dehumidifier provides quiet sound operation and is compatible with 110V AC to 120V AC single phase 60 Hz power sources and comes with a five-year manufacture warranty.
Pros
- Long warranty
- Easy to Maintain
- Easy to Read Control Panel
Cons
- Heavy
- May Need Professional Installation
- Short Cord
Why Buy: Featuring corrosion-resistant coils and set-it and forget-it easy functionality, the Aprilaire 1820 dehumidifier is an ideal choice for a sealed crawl space.
5. Dri-Eaz PHD 200 Commercial Dehumidifier F515
The Dri-Eaz PHD 200 F515 dehumidifier can remove up to 120 pints of moisture fast in up to 15,000-cu. ft. area. The compact dehumidifier is easy to install, and due to its stackable nature, it can be easily put into tight spaces. The dehumidifier provides airflow in the range of 121- 180 CFM. The dehumidifier is equipped with built-in mounting capability through an optional ducting kit, making it easier to hang from a ceiling or wall.
The Dri-Eaz PHD 200 features a built-in automatic pump and comes with a digital touchpad control for ease of operating, and mesh air filters for moisture free, clean air. The device features Dri-Eaz’s legendary rugged rotomolded housing and comes with digital touchpad control. The device can function in the temperature range of 33 – 100 degrees Fahrenheit. The Dri-Eaz PHD 200 comes with a lifetime limited warranty on the polyethylene chassis, a six-year warranty on compressor and coil, and a one-year parts and labor warranty.
Pros
- Easy to Set Up
- Compact
- Flexibility
- Energy Efficient
Cons
- Noisy
- Fan Runs Continuously
- Some users complained of leaks.
Why Buy: If you wish to rid large spaces of damp and moisture, quickly and efficiently, then the rugged but compact Dri-Eaz PHD 200 is definitely worth considering.
Comparison of the Best Crawl Space Dehumidifiers
| Dehumidifier Brand Name | Weight | Water Removal Capacity (pints/day) | Link |
|---|---|---|---|
| AlorAir Basement/Crawlspace Dehumidifiers | 59.52 lbs | 55 ppd | See price |
| Dri-Eaz F413 Revolution LGR Dehumidifier | 70 lbs | 80 ppd | See price |
| Aprilaire 1820 Crawl Space Pro Dehumidifier | 56 lbs | 75 ppd | See price |
| BaseAire Basement Dehumidifier AirWerx90X | 77.1 lbs | 90 ppd | See price |
| Dri-Eaz PHD 200 Commercial Dehumidifier F515 | 65 lbs | 75 ppd | See price |
Bonus Tips: Taking care of your crawl space isn’t easy, but it can be, with these recommendations –
- Keep checking on your crawl space for any cracks in the walls. Once in a while make sure space is in good shape. A little bit of care can go a long way.
- Make sure there are no leakages in the piping. It can cause a lot of problems, even with a dehumidifier.
- While installing a dehumidifier in a crawl space, make sure that the placement is good. Contact a professional if you’re not sure about how to do it.
- Keep the interior of your crawl space clean, so that it’s free of unwanted rodents. Proper ventilation is also a necessary ingredient in taking care of your crawl space.
- Make sure it’s properly insulated.
We hope you found this article helpful. Proper level of humidity is good for your health so be safe, and keep your home humidity to an optimum level.
Frequently Asked Questions
Q. Cost to Run a Crawl Space Dehumidifier?
The cost to run a dehumidifier depends on multiple factors, including room size, type, duration of operation, humidity levels, weather, etc. Since crawl spaces often have higher relative humidity and require running the device regularly for a long time.
In general, smaller dehumidifiers cost about $25 a year. However, as the dehumidifier grows in size, so do the bills. Larger units above 70 pints or more can reach a whopping $350 a year. It is beneficial to choose energy star certified dehumidifiers as they are more energy-efficient.
Q. Where to Place Dehumidifier in Crawl Space?
A crawlspace dehumidifier should be centrally located with adequate clearance to provide air circulation in the largest available space. If the dehumidifier can not continuously drain, you may need to access the crawl space to drain the collected moisture regularly, hence it should be convenient to reach if you need to drain the tank manually and for seasonal cleaning and maintenance.
If you have a U-shaped crawl space, you can place the dehumidifier in the center, in case if the crawl space is rectangular, the device can be placed at either end. Please use flexible ducting to separate the intake air from the exhaust air.
Don’t forget to check out our list of the best basement dehumidifiers with pump.