How loud is an AlorAir dehumidifier?
Plain figures run from 44 to 65 dBA, and upper limits from 49 to 63. AlorAir labels the number "Sound Pressure Level" and gives no microphone distance on any product page or sheet.
That leaves two kinds of number. A plain figure, like the Storm 80X's 60 dBA, is a claim about the unit. A ceiling, like the HDi90's less than 58 dBA, promises only that it will not be louder, and the real level may sit well below. Only the first kind is ranked here, one basis at a time.
The WHD documents add a test condition the others lack, so those four units get a list of their own.
Whole house units, at 0 Pa static pressure
| Model | Low noise mode | Maximum |
|---|
| WHD 100 | 44 dBA | 55 dBA |
| WHD 120 | 48 dBA | 62 dBA |
| WHD 150 | 52 dBA | 64 dBA |
| WHD 200 | 53 dBA | 65 dBA |
| Figure | Model | Build | AHAM capacity |
|---|
| 52 dBA | Sentinel Pro 55X | Upright | 55 pints a day |
| 55 dBA | Helios MP35 | Low crawl space cabinet | 35 pints |
| 58 dBA | Helios MP55 | Low crawl space cabinet | 55 pints |
| 60 dBA | Storm 80X | Restoration unit | 80 pints |
| Figure | Model |
|---|
| 48.2 dB | Sentinel Elite 50X |
| 48.5 dB | Sentinel Elite 60X |
| 57.5 dB | Sentinel Elite 80X |
| Printed figure | Models |
|---|
| Less than or equal to 49 dBA | Galaxy 60 and Galaxy 60P |
| Less than 50 dBA | HS35, HD35P, HD35PS (with and without WiFi), HD55 (Blue), HD55S White and Gold, HDi55 |
| Less than 52 dBA | HD55 Blue WIFI, HDi65S and HDi65S WIFI, Helios D35 (page table 52) |
| Less than or equal to 55 dBA | Galaxy 85P |
| Less than 57 dBA | HD55P |
| Less than 58 dBA | HD90, HDi90 in all versions, Storm DP, LGR 850, LGR 850X, SLGR 850X, Ultra |
| Less than 60 dBA | HDi100 and HDi120 (page tables 60), LGR 1250, LGR 1250X, SLGR 1250X |
| Two or more wordings | Pro 35X (52 and less than 50), Storm Pro (58 and at most 58), SLGR 1400X (60 and 60.3), Storm Elite (63 and at most 63), LGR Extreme (less than 58 and 58) |
None of these models is marked discontinued. Every dehumidifier page we opened printed some figure.
Across the four Sentinel WHD sizes, low noise mode lists 44 to 53 dBA and maximum 55 to 65, measured, the documents say, "In 0 Pa static pressure". The WHD 100 holds the lowest pair.
The table behind those numbers is headed "Noise in Constant Air Volume and Low Noise Mode", and each column pairs the noise with an airflow. Low noise mode moves 390 m³/h on the WHD 100 and 120 and 525 on the 150 and 200. At 0 inches of water gauge, the 100 moves 525 m³/h.
Zero static pressure means nothing pushing back on the fan. Once a WHD is ducted, the fan works against the ducts, and the printed figures become the best the cabinet can do rather than a promise about any room. The manual's fan speed button sets "low and high settings", and the low one is how you reach the smaller number. Ducting also puts distance and walls between the cabinet and the rooms it dries.
Product pages print only the maximum: 55, 62, 64 and 65 dBA.
In size, the WHD 100 and 120 share a 22.64 by 14.65 by 19.88 inch cabinet. The 150 and 200 are 37.3 by 23.4 by 24.3 inches and weigh over 180 pounds.
Product pages drop the less-than sign
A model can read 50 dBA on its product page and "< 50 dBA" on its PDF spec sheet, and AlorAir offers no reason for the difference.
It turns up on the HS35, HD35P and HD35PS, on both WiFi versions of the HD35 models, and on the HDi100 and HDi120, where the page reads 60 dBA and the December 2025 sheet "<60 DBA".
Some pages manage to contradict themselves without help from a PDF. The Pro 35X table lists 52dBA, while a paragraph lower down calls the unit "less than 50 decibels". On the HS35 and HD35P pages a third claim appears, that the units keep "the noise level below 55 decibels", looser than either figure. The Pro 55X page has a smaller slip of the same sort, swapping its AHAM and saturation capacities in one paragraph.
The rule here was simple. Where any AlorAir document gave a ceiling for a model, its figure counts as a ceiling, and the eleven ranked models carry the same plain number everywhere AlorAir prints it.
Are AlorAir crawl space dehumidifiers quiet?
Mostly they print ceilings, from 49 to 58 dBA. Two, the Helios MP35 and MP55, give plain figures of 55 and 58 dBA, while the Galaxy 60's ceiling of 49 is the lowest number in the group.
The popular Sentinel HS35 stands 11.4 inches tall and reads less than 50 dBA on its sheet. At the same 11.4 inches, the HD35P adds a pump and keeps that less-than-50 sheet figure, and the HDi90 with a built-in pump lists less than 58.
Under a floor, mounting counts too. AlorAir sells hanging kits, and for the Helios units a "Stable Installation Kit to provide a secure, level platform that minimizes vibration". Several sheets say a hung unit sends no noise or vibration to the floor above. No figure backs that up.
Our crawl space dehumidifier guide sets AlorAir's HS35 and HDi90 beside AprilAire and Santa Fe units, ranking each only against units from the same maker.
Storm units are job site machines
The Storm restoration range lists 58 to 63 dBA. Only the Storm 80X prints a plain number, 60 dBA, on both its page and its spec sheet, and the rest give ceilings or two wordings.
The Storm Pro reads 58 dBA on its page and "≤58 dBA" on its sheet; the Storm Elite, 63 dBA and "≤63 dBA". The LGR Extreme has two listings, one at less than 58 and one at 58, and the larger LGR 1250, LGR 1250X and SLGR 1250X list less than 60.
Look at what the 80X is built from: a rotomolded polyethylene housing, two large wheels and a 200 CFM fan, aimed at "the drying and water damage restoration industry". In a room someone lives in, that is the wrong tool. The 52 dBA Pro 55X or a ducted WHD lists less.
Is the Sentinel Elite quieter than the Pro 55X?
The documents cannot settle it. The Elite 50X lists 48.2 dB and the Pro 55X 52 dBA, and those are different units, since AlorAir gives Elite figures in dB on its pages and dBA almost everywhere else.
A dBA reading weights the sound toward what the ear hears best. A plain dB figure may or may not have been weighted the same way; AlorAir does not say which it used for the Elite range, and the Elite spec sheets carry no noise row to check against.
Inside the Elite range the order is clear: 48.2 dB for the 50X, 48.5 for the 60X, 57.5 for the 80X. The 50X and 60X share a 16.14 by 15.15 by 26.85 inch cabinet. The 80X moves 210 CFM against 132.
Level it, hang it, or turn the fan down
Three fixes come out of AlorAir's manuals: run a WHD on its low fan setting, keep any unit level and upright, and hang or raise crawl space units off the floor.
The Elite manual says its units "must be operated only while positioned upright and level on their feet". It also asks for "at least 6 inches (15 cm) of clearance" around the inlet and outlet, and for a new unit to stand upright for 24 hours before it is plugged in. Faced with loud noise from an unlevel machine, the HDi90 manual's troubleshooting table gives one fix: move it to flat, firm ground.
On a WHD, the low noise figures sit 11 to 14 dBA below the maximums. That gap costs a button press.
For other makers' basement units, see our basement dehumidifier guide, and for a ducted rival with "dBA ducted" figures, AprilAire's chart.
