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 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
· 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
500% Complete
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3 Stars
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Very quiet. Easy to use.
By 'Barnaby Tillman', Reviewed on April 15, 2021
Very quiet. Easy to use. Small compared to our old dehumidifier. The hose drain works great! It consistently keeps our large basement between 40-45% humidity which is quite comfortable and never smells musty or damp with this dehumidifier running.
Dehunidifier Works Great
By 'Teejay Watson', Reviewed on March 25, 2021
I spend weekends at my aunt's home and her house was built in 1911. The foundation is Riverstone and mortar and has never been waterproofed or sealed in any way and is about 35'x40' internal. Needless to say, when the ground freezes or we get a good soaking rainstorm the walls are damp to the touch and mildew is a huge problem, so a dehumidifier is an absolute must. This thing is an absolute champ, pulling much more dampness out of the air and walls than the previous unit, to the point where the air is actually crisp and dry. The ability to attach a hose and run the water directly into the sump pump is a huge boon as well. Plus, this is very quiet for the size, and she admitted in the first few days she had to check on it to see if it was running as she was used to the clanking thrum of the old unit. We are very happy with the performance, level of noise (basically none!), and ease of use with this dehumidifier.
Great equipment
By 'Waseem Appleton', Reviewed on March 15, 2021
The housing of this dehumidifier is made of sturdy material and looks very durable. Although it does have a certain weight, it is still very light, and any strong person can lift it. The device is easy to install, all you have to do is place it in a humid space, plug it in, and adjust the settings to your liking. By connecting the drain hose, the machine will automatically drain, so you don't need to pay special attention.
Quiet unit, easy to use
By 'Sultan Quintero', Reviewed on March 08, 2021
I am glad I chose this dehumidifier, the product is exactly what I want. I have been using it for a few months and it is perfect for my old damp basement, it is lightweight and easy to use, the filter is easy to clean, and it's super quiet! Overall I am very satisfied with my purchase and would recommend it.
Easy to install, quiet and compact
By 'Lana Mccarty', Reviewed on March 01, 2021
I am very satisfied with this dehumidifier. This dehumidifier is quieter than I expected, is smaller and more attractive than my previous dehumidifier. It is easy to use and easy to install. I have some questions about the dehumidifier and contacted customer service. They responded quickly. I am very satisfied with the help of customer service to my problem.
Reliable and quiet
By 'Shae Reilly', Reviewed on February 22, 2021
It is very quiet and efficient. Easy to install anywhere. The drain pipe is not very long, so it is restricted when used. I use it in the basement. Surprised how much moisture this machine absorbs from the air! I am very satisfied with this product and would definitely recommend it. We have not encountered any problems. I will buy this model/brand again.
Overall a good unit
By 'Maximus Thorpe', Reviewed on February 07, 2021
This dehumidifier does a very good job of keeping the small basement dry! Compared with our previous ones, it is so small, compact and quiet, which surprised me. This unit has been working in the basement for several months, and our basement no longer smells of humidity! Highly recommend!
Great product!
By 'Roberto Gallagher', Reviewed on February 01, 2021
Excellent quality, very compact and quiet. I purchased this product based on all reviews. I have been running this dehumidifier in the basement for several months and it helps to keep the entire basement (about 900 square feet) of moisture. I am very happy about this. I am very satisfied with my purchase and would recommend it to others.
The machine works well
By 'Korey Luna', Reviewed on January 25, 2021
The effect of this dehumidifier is very good. We use it in a 1000 square foot basement. It does a great job. We have been running this machine almost all the time and it has not caused us any problems. Even at low temperatures, the automatic defrosting system of this unit can make it work well. Overall, we are very satisfied with this product, and it is much cheaper than other products that perform the same function.
Great product
By 'Jerry Boyle', Reviewed on January 18, 2021
I really like this dehumidifier. It eliminates a lot of moisture in my basement. I have many dehumidifiers, but this is definitely the best I have ever bought. As long as it keeps working as it has in the past few months, I will be very happy. I actually think I will buy another one. Great product!


Can the feet on the bottom of the dehumidifier be adjusted?

Kobie on March 02, 2021

1 Answer

Answered by Alorair
Hello, the feet on the bottom of the Sentinel HD55 dehumidifier are adjustable. Thanks for your question!
What should I pay attention to when storing this device?

Jonah on February 23, 2021

1 Answer

Answered by Alorair
Hello, when you want to store this machine, you must comply with the following regulations. • Turn off the dehumidifier and let it dry. • The power code should be packed and fixed. • The filter should be protected by covering. • Make sure to store the equipment in a clean and dry place. Thanks for your question!
Should I use the device switch to turn off the device or the power switch to turn it off?

Chantal on February 08, 2021

1 Answer

Answered by Alorair
Hello, when you want to turn off the unit, please use the remote control or turn it off on the device switch. Avoid using the power switch to turn it off. Thanks for your question!
What is the evaporator type of this dehumidifier?

Kaycee on February 02, 2021

1 Answer

Answered by Alorair
Hello, the Sentinel HD55 dehumidifier is equipped with a rare earth alloy tube evaporator. Thanks for your question!
What is the compressor type of this dehumidifier?

Fenton on January 26, 2021

1 Answer

Answered by Alorair
Hello, the Sentinel HD55 dehumidifier is equipped with a rotary compressor. Thanks for your question!
What is the power of this dehumidifier?

Arnas on January 19, 2021

1 Answer

Answered by Alorair
Hello, the power of the Sentinel HD55 dehumidifier is 115V / 60 Hz. Thanks for your question!
Does the dehumidifier automatically defrost?

Tarik on January 12, 2021

1 Answer

Answered by Alorair
Hello, the Sentinel HD55 dehumidifier has an automatic defrost system, which ensures that the ice is quickly removed from the coil when the operating temperature is 33°F. Thanks for your question!
Is this Sentinel HD55 dehumidifier equipped with a filter?

Jevan on January 05, 2021

1 Answer

Answered by Alorair
Hello, the Sentinel HD55 dehumidifier has been equipped with filters to protect the internal components from dust and other particles, thus ensuring efficient operation and long-term use. Thanks for your question!
What is the working humidity range of the dehumidifier?

Jannah on December 29, 2020

1 Answer

Answered by Alorair
Hello, the working humidity range of the Sentinel HD55 dehumidifier is between 35% and 90%. Thanks for your question!
Is the dehumidifier equipped with a humidity regulator?

Leigha on December 22, 2020

1 Answer

Answered by Alorair
Hello, the Sentinel HD55 dehumidifier is equipped with a humidity regulator. When the humidity exceeds the set point, it starts to dehumidify. Thanks for your question!

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