AlorAir Sentinel WHD 120, Ducted Whole-House Dehumidifier
A ducted, commercial-grade whole-house dehumidifier rated 104 PPD at AHAM (85 PPD at DOE conditions) for envelopes up to 3,000 sq ft, with GPP mode and MERV-10 filtration.
Room dehumidifiers patch one damp space at a time. The Sentinel WHD 120 is the infrastructure version: a ducted 104-PPD unit that holds a whole 3,000 sq ft envelope at target humidity from the mechanical room.
Price: $1,999 · Verified: 2026-08-16
Room dehumidifiers patch one damp space at a time. The Sentinel WHD 120 is the infrastructure version: a ducted 104-PPD unit that holds a whole 3,000 sq ft envelope at target humidity from the mechanical room.
Humidity is the upstream half of indoor air quality: damp basements and crawl spaces feed mold and dust mites, and that air migrates into living space. Room-size dehumidifiers patch the problem one space at a time; the Sentinel WHD 120 is the infrastructure version, a ducted unit that conditions a whole 3,000 square foot envelope from a mechanical room.
The ratings deserve honest framing, because the category's headline numbers rarely get it. AlorAir rates the WHD 120 at 104 pints per day under the AHAM standard (80 F, 60 percent relative humidity) and 85 PPD under DOE whole-house conditions (73 F, 60 percent RH). Both are the brand's figures; the DOE number is the one closer to what a conditioned basement actually asks of the machine, so size from 85, not 104.
What $1,999 buys over a standalone unit is integration. Multiple duct mounting options tie it into supply and return runs, airflow is 229 to 309 CFM, and filtration is MERV-10, a real dust-and-pollen grade where most crawl-space units carry MERV-1 screens that protect the coil rather than the airstream. GPP mode targets grains per pound, absolute moisture instead of relative humidity, which reads more truthfully in spaces where temperature swings make RH misleading. Stated efficiency is 2.6 L/kWh at AHAM (2.4 at DOE) on SLGR coil architecture, with R32 refrigerant and auto defrost. AlorAir states cETL safety certification, and The Dry Air backs its dehumidifiers with a 6-year limited warranty, full coverage for the first 2 years.
Where it gives ground: this is an 89-pound, 115V/6.8-amp machine with a manufacturer-stated 62 dBA sound pressure level, so it needs a mechanical space and, realistically, an installer if duct runs do not already exist. If your basement is unducted and you just need coverage, AlorAir's own standalone Sentinel HDi100 covers 2,900 square feet for $1,050 and skips the install complexity entirely; a small crawl space is better served by the $699.66 Helios MP55.
The verdict is by house, not by spec sheet: ducted or duct-ready envelopes up to 3,000 square feet get the WHD 120; everyone else buys the standalone and keeps roughly $950.
Homeowners conditioning a whole-house, basement, or sealed crawl-space envelope up to 3,000 sq ft who want ducted, set-and-forget humidity control with MERV-10 filtration on the airstream, installed in a mechanical space away from living areas.
Your space has no ductwork and you do not want an install project (the standalone Sentinel HDi100 at $1,050 covers 2,900 sq ft), your crawl space is small (Helios MP55, $699.66), or you expect HEPA-grade air purification, which this is not.
Specifications
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AlorAir Sentinel WHD 120 Whole-House Dehumidifier cross-shops across several editorial surfaces on this site: the full brand catalog and the in-depth guides for its category.
AlorAir Sentinel WHD 120 Whole-House Dehumidifier - buyer FAQ
What do the 104 PPD and 85 PPD ratings mean?
Both are the brand's stated removal rates under different test conditions. 104 pints per day is the AHAM rating at 80 F and 60 percent relative humidity; 85 PPD is the DOE whole-house rating at a cooler 73 F. The DOE figure is closer to how a conditioned basement actually runs, so size from 85 PPD, not the headline.
How big a space can the WHD 120 handle?
AlorAir sizes it for up to 3,000 square feet of whole-house, basement, or crawl-space envelope, moving 229 to 309 CFM of air through duct-mountable supply and return connections. That ducted design is the point: it sits in a mechanical room and conditions the whole envelope rather than one room at a time.
Sentinel WHD 120 vs Sentinel HDi100, which one?
The HDi100 is a standalone unit at $1,050 covering up to 2,900 square feet with a built-in pump, and it is the simpler install. The WHD 120 costs $1,999 and earns the premium only if you want ducted integration, GPP control mode, and MERV-10 filtration on the airstream. Unducted spaces should buy the HDi100.
How loud is it?
AlorAir publishes a 62 dBA sound pressure level for the WHD 120, and that is the manufacturer's own figure, not an independent measurement. 62 dBA is conversation-level noise, normal for a commercial-grade unit but not bedroom-quiet, which is why this machine belongs in a mechanical room, crawl space, or basement, ducted away from living areas.
What warranty and safety certification does it carry?
The Dry Air states a 6-year limited warranty on its dehumidifiers with full coverage for the first 2 years, and AlorAir states cETL safety certification for the unit. Buy through thedryair.com, AlorAir's The Dry Air storefront: pricing differs from the manufacturer site, and the $1,999 figure with free US shipping is the thedryair.com listing we verified.
AlorAir Sentinel WHD 120, Ducted Whole-House Dehumidifier
$1,999 · Verified 2026-08-16
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