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

Model : Sentinel HD55S (White)

4.8 Average

$648.66 List Price: $1,200.00


The Sentinel HD55S 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: Energy Star/5 Years Warranty/ MERV-1 Filter/ Automatic Defrost/ cETL certified/ Optional Remote Control

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Product Overview

AlorAir Sentinel HD55S Conventional Dehumidifier (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-1 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 temperatures (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




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-1 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 44 Ibs (20 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 HD55S Dehumidifier

If you want to optimize the efficiency of the sentinel HD 55S 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 HD55S 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 where you want to control their 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 in 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 set point 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 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

96% of customers recommend this item

110 Ratings
4.8 Average
5 Stars
500% Complete
4 Stars
400% Complete
3 Stars
300% Complete
2 Stars
200% Complete
1 Stars
100% Complete
Customer service

From the Amazon

By 'Don', Reviewed on May 04, 2023
It set up easily enough, I like the control board and it operation. So far it is doing well in a crawl space I struggled to get below 65% humidity, now is holding 50-55%. Customer service is very responsive, and concerned about any issues I have had. Time will tell if it continues to perform.

From the Amazon

By 'wayne d', Reviewed on April 24, 2023
Had to send back as it leaked inside the cabinet! and what time it was used did nothing!.
A little noise level not real bad

From the Amazon

By 'R buckle', Reviewed on April 22, 2023
This is working great in my crawl space have it setting on vibration pads since it sets on a platform in order to drain into condensate pump worth the money
This one works

From the Amazon

By 'Paul S.', Reviewed on April 15, 2023
I have tried several home dehumidifiers. Various recognized brands, but under the outer shell they are all the same, made in the same Chinese factory. And they work, up to a point, and for a while. This one is different. Sure it is made in Chine too, but it is a rugged machine. And it really gets the moisture out. I am glad I bought it.

From the Amazon

By 'Don Hensley', Reviewed on April 09, 2023
Item was received damaged, the side of the machine was bent

From the Amazon

By 'its', Reviewed on April 09, 2023
Excellent quality! Highly recommend !
Good Dehumidifier

From the Amazon

By 'Marina', Reviewed on March 23, 2023
Good dehumidifier, way better then the normal consumer grade ones I have purchased in the past. I like that it has a filter that will help with air quality as basement air gets pulled up into the house. The vendor was very responsive over some issues with shipping damage that were technically Amazon fault. Also sent a replacement part when I needed it and the unit is made of metal and easy to open up and maintain by removing a few screws. I like things that can be cleaned and fixed by the consumer. Assuming I have not issues in the future I will definitely purchase from ALORAIR again.
Removed hundreds of gallons of moisture from my crawlspace

From the Amazon

By 'Jim J.', Reviewed on March 19, 2023
I had saturated wet soil in my crawlspace, and the dehumidifier ran continuously for more than a year. At first, the RH was about 80%, and the dehumidifier removed 4.5 gallons per day. After a year, the RH dropped to about 65%, and the dehumidifier removed 3.5 gallons per day. Now, I have fixed the drainage problem that caused the wet crawlspace, the soil is dry, and I have sealed the floor, walls, and vents. The dehumidifier comes on only occasionally and maintains 55% RH. After almost two years since purchase, I am very happy with the product!
Works great. Aloraire customer service is helpful!

From the Amazon

By 'Amazon Customer', Reviewed on March 16, 2023
Customer service was great! Had a small hiccup with the unit and they were on top of it quick.
Does the job

From the Amazon

By 'C. Starr', Reviewed on February 27, 2023
Bought it for our crawlspace which is about 1200 ft.2 with a sand floor. It has taken care of all the moisture issues. Only thing I wished is it would come with two filters so you could clean one and let it dry and put the other one in and they really should send you two for the price you pay


Can this be used in a garage? Does it need to be taken inside for storage during the winter, or can I unplug it and leave it in the garage?

Ella on December 16, 2021

1 Answer

Answered by Alorair
Yes, it can be used in the garage. You can leave it in the garage with something well covered for storage. Make sure no dust and rusting.
I have about a 1200sq ft basement with a finished drop ceiling. Will this dehumidify the area below the drop ceiling mounted in the ceiling, or do I need ducts?

Pippa on October 05, 2021

1 Answer

Answered by Alorair
If it is inside the ceiling, it will not dehumidify the space below it. It needs to be placed in the same room that needs the dehumidification. This unit can only be ducted using the exhaust.
Can this unit be set on a shelf up high and work as it should?

Elias on September 03, 2021

1 Answer

Answered by Alorair
Hi Elias! This unit can be set on a shelf up high, make sure it's a flat surface and the drain hose and exhaust are on the sides.
What is the energy efficiency of those units (L/kwh)?

Enzo on September 03, 2021

1 Answer

Answered by Alorair
Hi Enzo! We can show you a set of statistics: 2.4L/Kwh, Sentinel HD90/HDi90 current only 5.56A with COP 2.88L/Kwh.

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