Pints Per Day product guide
AlorAir Sentinel HD55 Crawl Space Dehumidifier (Blue)
An unheated crawl space with a gravity drain below the unit
A metal-cased crawl-space dehumidifier with no water tank: condensate leaves by gravity hose only. AlorAir rates it 53 pints a day at 80°F and 60% humidity, or 113 at saturation, and it keeps working down to 33.8°F with auto defrost. R410A refrigerant, MERV-1 filter, 44 pounds.
Listing checked . Confirm the model, included parts and availability before ordering.
Published specifications
- Maker spec sheet: 53 pints/day at 80°F 60% RH; 113 pints at saturation; up to 1,200 sq ft
- Maker spec sheet: functioning temperature 33.8-104°F, auto defrost, humidity 36-90%
- Maker spec sheet: 115 V 60 Hz, 4.0 A, 120 CFM (205 m3/h), 2.27 L/kWh
- Maker spec sheet: gravity draining only, no water tank, R410A refrigerant
- Maker spec sheet: 19.2 x 12.2 x 13.3 in, 44 lb; MERV-1 filter, adjustable feet
- Listing warranty field: 1 yr parts and labour; 3 yr refrigeration parts and labour; 5 yr refrigeration parts
Fit and limits
Strengths
- Keeps running down to 33.8°F with auto defrost, where room dehumidifiers stop
- No bucket to empty: gravity drainage is the only mode, so it can be left alone
- AlorAir publishes a model-specific spec sheet with the test condition stated
Caveats
- The headline six-year warranty is layered; full parts-and-labour cover is one year
- Gravity-only drainage means it must sit above the drain, often on a hanging kit sold separately
- Amazon's spec table lists a 14.12-gallon tank; this unit has no tank at all
A metal-cased crawl-space unit with no water tank at all
The Sentinel HD55 is a commercial-style dehumidifier in a metal housing, sized for crawl spaces, basements and small commercial rooms up to 1,200 square feet. AlorAir's specification sheet lists a rotary compressor, a rare-earth alloy tube evaporator, a MERV-1 filter that slides in from the side, adjustable feet, a carry handle and a rated 120 CFM (205 m³/h) of airflow at 115 V, 60 Hz and 4.0 amps.
It has no bucket. Draining is gravity only, which AlorAir states as "Gravity Draining" in its specification table and the listing puts as "there is no tank inside, it drains automatically". Amazon's spec table nonetheless carries a Tank Volume field of 14.12 gallons. That field is wrong; there is no tank, and you should plan around a permanent hose run to a drain below the unit.
Both AlorAir and the listing describe it as ETL or cETL listed. The box contains the dehumidifier, one MERV-1 filter and a user manual.
113 pints and 53 pints are the same machine, measured differently
This listing is unusually clear about its own numbers: "113 PPD at saturation, 53 pints per day at AHAM". AlorAir's specification sheet puts the second figure precisely: Capacity 53 pints at 80°F and 60% relative humidity.
Eighty degrees at sixty percent is not the 65°F condition used for the current Department of Energy portable-dehumidifier rating, and neither AlorAir document publishes a DOE-rated pint figure or an ENERGY STAR certification for this model. So you cannot compare the 53 against a modern home unit's pint rating without knowing that.
The 113 is the saturation figure, taken in conditions far wetter than a normal crawl space. AlorAir's own product page says the unit "can remove 113 Pints at saturation" and separately "53 Pints/Day @ AHAM". Size the machine on 53, not 113.
It runs cold, which is the point of buying it
AlorAir's specification sheet gives the functioning temperature range as 33.8 to 104°F and says the auto-defrost system clears ice from the coil down to a minimum operating temperature of 33.8°F. Amazon's Upper Temperature Rating field agrees at 104°F. That low-end figure is the reason this class of machine gets bought for unheated crawl spaces, where a room dehumidifier that stops below 41°F is no use.
There is one inconsistency in AlorAir's own materials. The product page's key-features list says auto-defrost allows operation at low temperatures of "36 degrees Fahrenheit", while the specification sheet says 33.8°F twice. The gap is small but real; if you are running the unit near freezing, plan on the higher of the two.
The defrost cycle works the usual way: the listing says the compressor stops while the fan keeps running until the frost thaws, then normal operation resumes. Humidity can be set between 36% and 90%, and the unit restarts on its previous settings after a power cut.
Where to put it, and how much room to leave
The body is 19.2 inches by 12.2 by 13.3, which is short enough for a low crawl space. AlorAir's specification sheet says the unit should sit near the drain access in the unfinished part of the basement, because condensate leaves by gravity, and describes the intended layout: duct the dry air into the finished area, and put a passive return grille or vent in the wall between the two so air circulates instead of putting the unfinished room under negative pressure.
AlorAir's product page includes a proper-use list, and two items on it are easy to miss. One says to keep a distance of six feet from any form of obstruction. The other says not to position the discharge and inlet against a wall. Between them, that rules out shoving the unit into a corner.
The same list contains its own contradiction about settling time: it says to keep the unit upright for about 30 minutes before use, and then, two lines later, that a newly delivered unit should settle for about 12 hours. Use the longer figure if the unit has just come off a truck.
Weight, hanging and the filter
AlorAir's specification sheet gives the weight as 44 pounds; Amazon's table says 41.7 pounds. Either way it is a two-person lift into a crawl-space hatch, and AlorAir sells a separate hanging kit of ratchet straps to suspend the unit from floor joists — which, its own document notes, also gives you the height you need for gravity condensate drainage.
The filter is MERV-1: a coarse dust screen to keep the internals clean, not an air-quality filter. Neither the product page nor the specification sheet prints a cleaning interval for it, and the 16-page service manual on AlorAir's site is a scan we could not read, so we are not quoting one. The product page does say to check the coils annually and that a foaming coil cleaner may be used, and to wipe the exterior with a damp cloth and mild soap solution.
The refrigerant is R410A. That is not a flammable refrigerant, but it is also not one of the lower global-warming-potential alternatives now appearing in this category.
The warranty is advertised as six years and written as something more layered
The Amazon title, the bullets and AlorAir's product page all lead with a six-year limited warranty, and the listing adds "first 2 years full coverage". The warranty description field on the same Amazon listing spells out a different structure: one year parts and labour on the whole unit, three years parts and labour on the refrigeration system only (compressor, condenser and evaporator), and five years parts on the refrigeration system only.
Read that carefully. Under the detailed wording, a fan motor or control board failure in year three is not covered, and after year five only the refrigeration parts remain in scope with no labour. The word "six" comes from stacking those periods, not from six years of full coverage.
We could not read AlorAir's full written warranty document, so treat the listing's field as the most specific wording we have seen and ask AlorAir to confirm the terms in writing before you rely on the headline number. Whatever the terms, check the seller and the condition of the offer you select.
Check the current listing
Confirm the model, included parts and availability before ordering.
Primary sources
- AlorAir product page for the Sentinel HD55 (Blue) commercial dehumidifier
- AlorAir Sentinel HD55 specification and installation document
Primary sources checked .
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Side-by-side pages, this model next to: Ivation IVADDH06 13-Pint Desiccant Dehumidifier, Midea Cube MAD20S1QWT 20-Pint Smart Dehumidifier, hOmeLabs 50-Pint Wi-Fi Dehumidifier for spaces up to 7,000 sq ft, Waykar JD025CE-80 ENERGY STAR Dehumidifier.