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

Buy on Amazon is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Additionally, participates in various other affiliate programs, and we sometimes get a commission through purchases made through our links.
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
4 Stars
400% Complete
3 Stars
NAN% Complete
2 Stars
NAN% Complete
1 Stars
NAN% Complete
Trustworthy products
By 'Cinar Stanton', Reviewed on July 06, 2020
When I first received Sentinel HD55, I did not know how to install it. I have never used the same type of product. Fortunately, through the user manual, I understand the installation process, it is very easy to install and set up. I put the drain pipe into the bucket to check if it works, and I'm happy to have nearly half of the water in the bucket in a day.
Pay for quality products
By 'Israr Camacho', Reviewed on June 29, 2020
This is the first dehumidifier in the true sense that I have, and this is the most praised humidity control unit. It works and is very quiet! The dehumidifier products I bought before for less than $100 did not work. For consumers, this is deceiving. Don't try to buy cheap and inferior products cheaply, but buy products that can be used.
Ideal for basement
By 'Usman Parker', Reviewed on June 22, 2020
Due to the arrival of summer, our basement is poorly ventilated, so the air humidity is particularly high. We used to use the same dehumidifier to solve the problem, and this time is no exception. AlorAir® Sentinel HD55 can effectively reduce humidity and remove at least 55 pints of water every day, making it ideal for basement spaces.
Quiet operation
By 'Tyrique Farrington', Reviewed on June 13, 2020
I am happy to buy the Sentinel HD55 dehumidifier. We used to buy a dehumidifier on Amazon, but that model is inefficient and makes a lot of noise. Sentinel HD55 runs quietly and can dehumidify within 1,300 square feet. For us, this is the best choice.
Don't hesitate to buy with confidence
By 'Kaeden Jefferson', Reviewed on June 06, 2020
AlorAir® Sentinel HD55 exceeded my expectations! It has passed multiple quality certifications, so I don't have to worry about its durability. It is worth noting that it has an air duct option for dehumidification, and it can be controlled remotely through remote control.
very suitable
By 'Joann Zavala', Reviewed on May 29, 2020
This is a dehumidifier that suits me very well. I like its quiet operation, which allows me to work at ease. It extracts at least 55 pints of water every day, which is enough for my small house, and I do n’t need to worry about my house being damaged by mold.
One of the best dehumidifiers
By 'Mariana Smith', Reviewed on May 08, 2020
AlorAir® Sentinel HD55 dehumidifier does a good job. In most similar products, this is one of the most praised humidity controllers. It has passed several quality certifications and has a 5-year warranty. Full-featured, with a dehumidification capacity of at least 55 pints per day, it can be installed in any space requiring dehumidification.
Can be used for a long time
By 'Fiona Bennett', Reviewed on May 05, 2020
I have used Alorair®55 pint dehumidifier for more than two months and the effect is very good. It will not be too noisy during operation, and has good performance and quality, can be maintained and used for a long time.
By 'Erika Dunne', Reviewed on April 30, 2020
I don't know, my basement is leaking and a large area is soaked. Experts brought this compact dehumidifier for repair work. It extracts water from the air to reduce the humidity level. It ’s really easy to use, and I ’m thinking about whether I should buy it myself so that it ’s needed when it ’s needed.
Quiet and energy-saving
By 'Philippa Hall', Reviewed on April 28, 2020
I bought this model dehumidifier and installed it in the underground storage area, the operation is very quiet. I know quiet is a relative term, but this is much quieter than my previous model. Moreover, it consumes less energy and does not need to pay high electricity bills.


What are some of the key features of a Sentinel HD55 Dehumidifier?

Dunne on June 24, 2020

1 Answer

Answered by Alorair
It is fitted with stainless side plates and coated coils. Its defrosting system is designed with the hot gas valve. It has the supper COP.
Can HD55 filter multiple times?

Kayla on April 27, 2020

1 Answer

Answered by Alorair
It is recommended to replace the filter at least once a month, please turn off the power and pay attention to ensure that the filter is dry when replacing.
What size hose for continue draining fit this unite Sentinel HD55 Basement & Crawl Space Dehumidifier?

Rory on March 11, 2020

1 Answer

Answered by Alorair
Please kindly find our hose size for Sentinel HD55: Inside Diameter: 14 millimeters; Outer diameter: 18.5 millimeters.
Does the fan run continuously?

Saima on November 11, 2019

1 Answer

Answered by Alorair
Yes, it needs the continuous operation of the fan to draw air into the dehumidifier
Does this unit (AlorAir® Sentinel HD55) need to have a separate circuit to plug into?

Naya on October 31, 2019

1 Answer

Answered by Alorair
Hello, it is better to plug the Sentinel HD55 dehumidifier into a separate circuit. Thanks for your question!
Does the AlorAir Sentinel crawl space basement being sold have the lastest built-in digital controls?

Murat on September 29, 2019

1 Answer

Answered by Alorair
Hello, there is a digital control panel on the top of the Sentinel HD55 dehumidifier for setting the humidity percentage. Thanks for your question!
How much water is discharged at the end of the day?

Samera on August 27, 2019

1 Answer

Answered by Alorair
Hello, the water removal capacity of the Sentinel HD55 dehumidifier is 120 PPD at saturation condition and 55 PPD at AHAM. Thanks for your question!

Related Products