HD90 specs
| Brand | AlorAir |
|---|---|
| Capacity (AHAM, 80°F/60% RH) | 90 pints/day |
| Marketed capacity (saturation) | 198 pints/day — see the AHAM note below |
| Max coverage | 2,600 sq ft |
| Drainage | Gravity drain |
| Dimensions | 23.2" L x 15.2" W x 17.7" H |
| Weight | 67.2 lbs |
| Power draw | 5.56A |
| Airflow | 210 CFM |
| Noise | 58 dBA |
| Filter | MERV-1 (MERV-8 optional) |
| Energy Star | Yes |
| Warranty | 5 years |
| Price tier | $$ Mid-range ($1,000–$2,000). See Amazon for today's price. |
- AlorAir markets this as 198 pints/day (saturation, 90°F/90% RH); the AHAM rating is 90 pints/day.
- AlorAir's own site advertises a 6-year limited warranty on this model; most resellers list 5 years.
Specs are compiled from manufacturer listings and may change between production runs. Confirm on the retailer page before buying.
The AlorAir Sentinel HD90 sits in the sweet spot of this guide: 90 pints/day of honest AHAM capacity at a street price around ~$1,000–1,100. The box claims 198 pints/day — we’ll decode that below — but at the real number it covers up to 2,600 sq ft, carries Energy Star rating with a 2.69 L/kWh efficiency figure, and offers ducting options plus optional remote monitoring that its smaller sibling lacks. Spec sheets show 23.2”L x 15.2”W x 17.7”H and 67.2 lbs — substantial, but manageable for crawl space duty.
Who the Sentinel HD90 is for (and who should skip it)
This is for medium-to-large problem spaces: full basements, large crawl spaces, and homes in the 1,500–2,600 sq ft range where 55-pint units can’t keep up. If you want ducting flexibility, remote monitoring, or cold-weather auto-defrost down to 33.8°F, the HD90 is the AlorAir to get. Our guide on how to choose a whole-house dehumidifier and the capacity sizer can confirm whether 90 pints fits your space.
Skip it if the 198-pint headline is what sold you — buy on 90 AHAM pints or don’t buy. Skip it too if your space is small (the HD55 is cheaper and quieter), or if you need the very largest capacity for a big house — the AprilAire E130 outclasses it there.
Capacity: the AHAM number vs the box number
Another textbook entry for the AHAM vs saturation pints explainer: the “198 pints/day” headline is the saturation number at 90°F and 90% RH — laboratory extremes, not your basement. The AHAM-rated 90 pints/day is the real, comparable figure, and AlorAir does publish it in the spec sheets. This isn’t a scam; it’s saturation marketing, and every buyer should learn to translate it. At 90 honest pints for ~$1,000–1,100, the value proposition is genuinely strong — just make the decision on 90, not 198.
Installation and drainage
At 67.2 lbs and 23.2” long, this is a two-person carry into a crawl space — plan the route before it arrives. Drainage is gravity drain; add a condensate pump if your drain sits above the unit. Where the HD90 earns its keep over the HD55 is flexibility: ducting options let it integrate with existing ductwork or serve as a dedicated ducted system, and optional remote monitoring means you can check humidity and status without crawling under the house. Auto-defrost down to 33.8°F keeps it running through cold snaps that freeze up lesser units — a real differentiator if your crawl space sees winter lows.
Noise, energy and running costs
58 dBA is noticeably louder than the HD55’s sub-52 figure — audible if it’s near living space, a non-issue in a crawl space or basement. Energy Star rating and a stated 2.69 L/kWh efficiency figure put it among the efficient options here; at 5.56A it’s mid-pack on draw. For a unit that runs unattended in an unconditioned space, efficiency-per-pint is what matters most — a unit pulling 90 pints a day can run for long cycles in humid months, so the per-pint efficiency has a bigger effect on your bill than the headline amperage. Run your rate through the operating-cost calculator to see the monthly figure.
Maintenance
One honest weakness: the stock filter is MERV-1, which is thin — budget for the optional MERV-8 upgrade if your space is dusty. Otherwise maintenance is standard: clean the filter, keep the drain line clear, verify defrost cycles in winter. Warranty is 5 years per the standard spec sheets (AlorAir’s own site claims a 6-year limited warranty — check which terms apply at purchase and register promptly). One more note: at 67 lbs this is not a unit you’ll want to haul in and out of a crawl space for seasonal storage, so plan on it living there year-round.
The Sentinel HD90 is the capacity-per-dollar champion here: 90 honest AHAM pints, Energy Star efficiency, ducting flexibility, cold-weather defrost, and remote monitoring — all around the ~$1,000 mark. Positioned between the HD55 and the AprilAire E130, it’s the mid-tier pick for buyers who outgrow the small unit but can’t justify the heavyweight. The 198-pint headline is saturation marketing, not fraud; buy on the 90 and you’ll get exactly what you paid for. Check the current price on Amazon, or see how it stacks up in the full dehumidifier reviews.