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

Model : Sentinel HD55

4.9 Average

$648.66 List Price: $1,200.00


The Sentinel HD55 is a perfect device for crawl spaces and basements.  With an updated compact design and smaller size, this unit can be installed very easily in a low clearance crawl space or tight basement. But please don't be fooled by its appearance, it can remove 120 Pints at saturation(55 PPD at AHAM)

Highlights: 5 Years Warranty/ MERV-8 Filter/ Automatic Defrost/ cETL certified/ Optional Remote Control

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Product Overview


AlorAir Sentinel HD55 Conventional Dehumidifier (in White)
Moisture remains the greatest threat to your home’s structural integrity. Increased humidity levels indoors can cause the growth of mold and mildew and an increase in dust mites. These are known allergens that cause respiratory problems and asthma. This is why need to invest in a dehumidifier today.



· Ultra-compact design with super performance
· Adjustable foot pad and portable handle to transport and install easily
· MERV-8 filter to protect internal components from damage from dust and other particles
· Rare earth alloy tube evaporator to avoid freon leakage and prolong the service life of the coil
· Auto defrost technology to allow operation at low temperature (36 degrees Fahrenheit)
· cETL Certified to withstand more rugged conditions 
· Precise humidity maintenance to automatically maintains your ideal humidity level from 36% to 90% 
· Automatic diagnosis system to get troubleshooting tips through error codes
· Gravity drainage for no need to check the tank regularly
· Memory Restart to automatically restart to previous settings after a power outage
· Easy to use graphical control panel
· Optional remote control for remote sensing and control areas
· Hanging kits to reduce noise and vibration



1. Protection from disease - Harmful microorganisms live in high humidity environments and damage the surfaces they reach. Not properly extracted and prevented, they can cause various health risks such as allergies, skin irritation, respiratory illnesses, and immune-related diseases. Another dangerous group that poses health risks is mosquitoes. They also thrive in moist places. They can infect people with nasty diseases like dengue fever or malaria. Fortunately, a dehumidifier helps prevent their growth and harmful effects. 
2. Cost-effective: Buying a dehumidifier is one of the best investments a person can make. It's designed to function optimally and is energy-saving. Plus, it can prevent damage caused by excessive moisture in the long run.
3. Optimal remediation support - Users can be sure they'll get maximum performance to facilitate their remediation work. It's portable, durable, and reliable in the remediation of severe water damage.
4. Protecting property from damage - The place will be inhospitable to harmful microorganisms that could attack your valuables. 
5. Priority safety by preventing structural problems - can primarily prevent accidents if you have a dehumidifier at home that prevents excess moisture from weakening the structure and foundation of your home.  
6. Pleasant workplace - It's been proven that a workplace is positively affected by fresh air to breathe. When you provide perfect ventilation, your employees will be optimally productive and benefit from each other's motivated work ethic.  
More so, all of our dehumidifiers come with a reliable warranty, which you can also read about on this website. If you've any further questions, don't hesitate to contact our customer service representatives. We'll be happy to help you decide on your dehumidifier needs.

Power 115 V/60 Hz
Current(115v/60Hz) 4.1 A
COP(115v/60Hz) 2.4 L/Kwh
Size For Up to 1,300 Sq.Ft.
Filter MERV-8 Filter
Air flow 130 CFM,230 CMH
Sound Pressure Level <52 dBA
Refrigerant R410A
Draining Gravity Draining
Defrosting Control system Automatic Defrosting
Functioning perature Range 33.8-104℉
Functioning Humidity Range 36%-90%
Capacity115V(80ºF-60%)) 55 Pints
Weight 57.3 Ibs (26 kg)
Dim(L x W x H) 19.2×12.2×13.3 in
Shipping Dim (L x W x H) 22.3x16.6x16.4 inch
Loading Quantity 20': 260 Sets ; 40': 565 Sets ; 40'HQ: 678 Sets


How to use Sentinel HD55 Dehumidifier

If you want to optimize the efficiency of the sentinel HD 55 Dehumidifier, you need to do the following:

· Place the dehumidifier on a dry level surface. Avoid putting it on a vapor barrier such as a damp basement.
· Consult the manual when installing the unit
· When you want to switch the unit on or off, make use of the remote control.
· Avoid using the power switch to switch it off.
· Use the arrow keys to set your desired humidity level. Choose anything between 50- 55%.
· Even after the unit has been switched off via the remote control, ensure that you allow the fan to continue running until it stops. It helps to remove the dissipated heat.
· The unit drains itself automatically as it operates. However, if you are planning to keep it in-store, you must give an allowance of at least 10 minutes so that it can defrost. You should lean the drain a little bit to ensure that the unit drains completely.  

When you want to store the unit, the following must be observed.

· Turn off the dehumidifier and allow it to dry
· The power code should be wrapped and secured
· The filter mesh should be protected by covering it
· Ensure the unit is stored in a clean dry place


Where It Can Be Used Application

The unit finds a lot of applications in warehouses, basement, crawl spaces, and even offices. It is also used in shops, storage areas, apartments, and factories. Other places where the unit is likely to be used are in bars and restaurants and museums. It is also widely used in computer rooms to reduce dampness or dust. Sentinel HD 55 is an energy-efficient product that is, CE, ETL.

It is a whole-house dehumidifier that can be relied on to solve damage to any building. If a building suffers from dampness, Sentinel HD55 can be deployed to provide a solution to the humidity problem. The dehumidifier comes with a filter that makes installing it much easier.  The fact that it features optional duct mounting flanges reduces the time it takes to have it installed.


How the Unit Operates

You will select the relative humidity you want. It uses the integral humidistat to monitor the space and conditions. When the humidity level rises beyond the set levels, the unit energizes. When this happens, it draws air across the evaporator coils. Typically, the coils will be cooler than the dew point of the air. Moisture will then condense out of the air.  The remaining air will then be reheated and distributed into the condenser coil. It will then be redistributed in the house.


Installing The Unit

Ensure that you use vapor barriers to seal off the areas that you want to control its humidity levels. If it is the crawl spaces, check and ensure that all the vents are sealed.

Also, ensure that the environment in which you want to install the dehumidifier is not corrosive. Notice that we have some liquid barriers that dry through solvent evaporation. So it is your mandate to ensure that the barrier is dry and that the area is sealed.

Before using the dehumidifier, check and ensure that it is placed on a level surface.  Avoid placing it to a vapor barrier.

Set the desired humidity level using the up and down button.  Choose the most comfortable level for you. It should range from 36-90%. Once you set your point, the machine will stop dehumidifying as long as the setpoint has been reached. When indoor humidity rises above the set level, the machine automatically starts operating.

You can choose to set the machine into continuous mode. This can be done by using the up and down arrow. Check and ensure you see the continuous button illuminate green. It indicates that the unit has been switched to a continuous mode. You will see CO on the display screen.


Cleaning the unit

To optimize the use of the dehumidifier, it is necessary that you clean its body.  You need is a soft piece of cloth to do this. Soak it in water without soap or solvent and use it to wipe the dehumidifier. Also, you may unplug and clean the filter by washing it with soap-less water. Alternatively, you may choose to vacuum the unit.  Just try to ensure that it dries before reinstalling it.  Notice that the coil must also be cleaned once in a year. You may use an approved coil cleaner to do this job.



· Before powering the sentinel dehumidifier, ensure that it is connected using a grounded electrical connection.
· When you choose to have the unit repaired or maintained, ensure that you get a competent technician.
· If you choose to move the dehumidifier to another place, unplug it from the power supply.
· If the unit gets flooded with water, it is recommended that you open it so that it can dry before attempting to reconnect it.
· Don't position the discharge and the inlet onto the wall. Ensure that the inlet has a 12'' space clearance while the discharge should have a 36'' clearance.
· If the unit is close to a wall, ensure that the inlet is parallel to the wall while the discharge should face away from the wall.
· If you choose to clean the unit, ensure that it is unplugged from the power source.
· Don't use the machine as a support when you want to reach items that are high.


Why the need for a dehumidifier?
Huge costs are incurred every year through inflated building maintenance costs and damaged inventory as a result of dampness. ALORAIR dehumidifiers are effective solutions to environmental control problems. Excess humidity in your premises results in corrosion, mold growth, and condensation. By installing an ALORAIR dehumidifier controlled humidity conditions can be maintained to provide protection in larger commercial areas and buildings.

Reviews & Questions

98% of customers recommend this item

95 Ratings
4.9 Average
5 Stars
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Happy with that!
By 'Sawyer Smith', Reviewed on 2021-08-24 10:42:31
I've got a sealed crawlspace that needs dehumidification. The unit was double boxed (dehumidifier w/ 4 foam corner brackets in a box, then that box was padded and inside another box). The unit itself was in perfect condition and started right up. The unit felt very industrial and was well made. I opened it up and took a quick look around. The components were well made, and electrical connections were solid. The filter is easy to remove and reinstall after cleaning. The controls were intuitive. I also bought the additional remote control and was happy with that.
I highly recommended it!
By 'Maya Burton', Reviewed on 2021-08-23 09:50:44
The Alorair HD55 is one of the smallest crawl space dehumidifiers on the market. And it is a quality design. This unit has a coated coil (in which the aluminum fins and copper tubing are coated). It is held together with stainless steel plates. Secondly, the humidifier sensor is separated from the evaporator coil and is located on the lower end of the unit to minimize triggering by evaporating moisture from the evaporator coil. Additionally, a remote controlling sensor is available with a 25-foot cable to enable complete separation from the sensor from the evaporator coil. The unit has a MERV 8 removable filter to keep the coils clean. It is very quiet when operating. The only way for me to tell if the unit in the crawl space is running is to put my ear against the floor to hear it as the sound is too faint. I highly recommend the hanging unit.
By 'Winnie St. James', Reviewed on 2021-08-18 11:15:01
I have a damp crawl space in a lake house. The dehumidifier took a couple of days to bring the humidity down but only turns on when needed, uses far less power, and is quiet. Clean or replace the filter as required, and you can leave it to do its thing. The whole house is more comfortable than ever before. I did have one issue that needed help, and the seller was right on it with a perfect solution. I don't often post reviews, but this item, and seller, are fantastic!
The best one!
By 'Evelyn Wilson', Reviewed on 2021-08-16 18:25:38
I am running an Alorair Sentinel HD55 dehumidifier in my finished basement. The unit is solidly built, efficient, effective, and relatively quiet. Set 48% relative humidity, it operates reliably with six-point hysteresis, turning on at 51% and off at 45%. The remote controller, purchased separately and located in still air about four feet from the HD55, gives longer and more efficient duty cycles. With the HD55 level and its filter clean, I measure 65db at three feet. The sound is almost entirely that of rushing air. The compressor is audible but at a significantly lower. Overall, I find the Alorair HD55 to be of higher quality and offer greater versatility than any other dehumidifier I have used.
So delightful!
By 'Harper Edwards', Reviewed on 2021-08-16 18:04:57
I have a decent-sized home with a 1500 sq ft finished basement and a garage built on a concrete slab about 500 sq feet. The concrete in these areas, plus the cellar being below ground level, creates a substantial moisture issue. I have run two dehumidifiers Simultaneously in the past in my basement alone. In comparing the performance, the sentinel amazed me by pulling more moisture in a shorter time, and the sentinel is lightweight and easy to move. In addition, It comes with a drain hose and easy to remove and clean filter. I’m delighted with the product.
good value for money
By 'Peter Smith', Reviewed on 2021-08-09 16:51:18
My basement is always wet. Because the basement is too damp, it gets moldy. I've been looking for a good dehumidifier. This dehumidifier is really good value for money. It dehumidifies well and is easy to operate.Plug it in, set it up, and within hours, the basement is dry. And the machine is kind of quiet, and easy to use. I would like to recommend this dehumidifier to all who are looking for such products.
Great value for the money!
By 'Lisa Walker', Reviewed on 2021-08-03 09:31:20
Our basement was damp. This dehumidifier was easy to set up so that it tends itself and runs when needed. It came with a drain hose and pumps water to a sewer opening. The musty smell is gone. For now, I couldn’t be more satisfied. It may expensive than the room model, but it works as if it will keep our lower level more comfortable than the previous room models ever did.
great dehumidifier
By 'Quinn Smith', Reviewed on 2021-07-26 09:54:49
I like the small size and modern design unit. It fits perfectly in my basement. The dehumidifier can drain through the hose, so I don't need to empty the water tank all the time. Super convenient and effective. It is such a cute and modern machine! I highly recommend it if you need a new dehumidifier! It’s so small and fits perfectly in our newly remodeled basement!
Great product
By 'Grace Mason', Reviewed on 2021-07-06 12:13:50
I am very happy to be able to buy this product. It is very light and portable, suitable for small space dehumidification. In addition, the device's current is 4.1 amperes, making it the most economical dehumidifier on the market and helping me save on my electricity bill.
Great product
By 'Samuel Phillips', Reviewed on 2021-05-13 18:43:19
I originally purchased a dehumidifiers of another brand item to use in our ~400 sq ft living room since we just moved closer to the beach. It was drawing an insane amount of water from the air, unfortunately I had to dump the filter at least once or twice a day. So I ended up returning this product, and purchasing an AlorAir® Sentinel HD55 dehumidifiers. Its ability to drain water is perfect even without a pump.


Where is the ALORAIR Sentinel HD55 made?

David on 2021-08-25 05:10:14

1 Answer

Answered by Alorair
Hi, David. We are an American company. Sales and after-sales are in the United States, and some products are manufactured in China.
I don't sleep very well. How many decibels is the dehumidifier running?

Timothy on 2021-08-03 09:45:13

1 Answer

Answered by Alorair
Hi Timothy, the decibel value of this unit is less than 52 DBA. Don't worry, and it won't affect your sleep.
Why call it the most economic dehumidifier on the market?

Jane on 2021-07-31 10:13:28

1 Answer

Answered by Alorair
Hi Jane, this is the lightest and the smallest crawl space dehumidifier you will get out there. The humidity sensor ensures that short cycling goes away as quickly as possible. It gives easy access to the units’ internal parts. The unit draws a current of 4.1 amps making it the most economical dehumidifier on the market.
What kind of drainage does this dehumidifier use?

Conor on 2021-07-27 09:38:13

1 Answer

Answered by Alorair
Hi Conor, this dehumidifier adopts gravity draining.
Does this model have a drain hose connection?

Kaitlin on 2021-03-25 14:02:56

1 Answer

Answered by Alorair
Yes, you slide out the water tank, feed the hose through the cut-out, and then replace the water tank. Ready to go.
Is the equipment equipped with wheels?

Hina on 2021-03-20 15:08:26

1 Answer

Answered by Alorair
The device doesn't have wheels but its stackable design saves more space and can transport large quantities of machines to their destinations.
Does this dehumidifier need batteries?

Tyla on 2021-03-16 15:21:45

1 Answer

Answered by Alorair
Hello, the Sentinel HD55 dehumidifier does not require batteries. The device operates by connecting to a power source. Thanks for your question!
If the dehumidifier is designed for low-temperature operation, what is its minimum operating temperature?

Casey on 2021-03-09 15:14:22

1 Answer

Answered by Alorair
Hello, the minimum working temperature of the Sentinel HD55 dehumidifier is 33°F. Thanks for your question!