How much area does the Sentinel HD90 cover?

AlorAir rates it for spaces up to about 2,600 sq ft. That suits most crawl spaces and medium basements; larger or very wet spaces may need two units.

Does it have a built-in condensate pump?

No. The base unit drains by gravity through the included hose, so it must sit above the drain point or you add an external pump.

Can it run in cold crawl spaces?

Yes. It operates from 33.8°F to 104°F, and the auto-defrost cycle temporarily stops the compressor to thaw frost while the fan keeps running.

What is the difference between 90 PPD and 198 PPD?

90 pints per day is the AHAM rating at standard test conditions; 198 pints is the saturation rating at higher humidity and temperature. Expect performance closer to the AHAM figure in a typical crawl space.

What comes in the box?

The dehumidifier, a 1.3 ft drain pipe and a MERV-1 filter. A pump, remote control and higher-grade filters are sold separately.

How does it compare with the Santa Fe Compact70?

The HD90 has higher capacity and airflow and a lower cold-weather cutoff, while the Compact70 is smaller and lighter. Both are ductable crawl space units without built-in pumps.

AlorAir Solutions

AlorAir 198 PPD Crawl Space & Basement Dehumidifier | Sentinel HD90 | Size for 2,600 Sq. Ft.

Q: Where is the AlorAir 198 PPD Crawl Space & Basement Dehumidifier | Sentinel HD90 | Size for 2,600 Sq. Ft. cheapest?

At Amazon, for $837.69, 20% under what the other stores charge, as of our latest check.

Q: Where can I buy the AlorAir 198 PPD Crawl Space & Basement Dehumidifier | Sentinel HD90 | Size for 2,600 Sq. Ft.?

15 stores we checked sell it, including Amazon, AlorairCrawlspace, Walmart, FactoryPure, Sylvane.com.

Best price now

$837.69at AmazonChecked 5 h ago

20% under what the other stores charge

Compared across 15 stores. Prices are checked against each store and labelled with when. Store links may earn us a commission. As an Amazon Associate, Deal.ai earns from qualifying purchases.

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What reviewers say

Owners of the Sentinel HD90 generally report strong moisture removal in crawl spaces and basements and reliable operation in cool temperatures thanks to auto-defrost. Common complaints center on the lack of a built-in pump and the plain controls.

What people mention

Moisture removalPraisedOwners say it dries damp crawl spaces and basements quickly and keeps humidity down.
Cold-weather operationPraisedThe auto-defrost cycle lets it keep working in cool spaces without frost buildup.
SizePraisedIts compact body fits through narrow crawl space openings where larger units do not.
Condensate drainageCriticisedWithout a built-in pump, owners must arrange gravity drainage or buy a separate pump.
ControlsMixedSome find the basic controls adequate; others want a digital humidistat and remote.
FilterCriticisedThe standard MERV-1 filter is thin and needs frequent cleaning in dusty crawl spaces.

About the AlorAir 198 PPD Crawl Space & Basement Dehumidifier | Sentinel HD90 | Size for 2,600 Sq. Ft.

The AlorAir Sentinel HD90 is a crawl space and basement dehumidifier rated at 198 pints per day (PPD) at saturation and 90 PPD at the AHAM standard. It is sized for areas up to 2,600 sq. ft. It can also be used in households, warehouses, offices and industrial settings.

It is more compact than conventional basement dehumidifiers, which makes it easier to transport, place and store. Its energy efficiency is rated at 2.69 L/kWh.

Built-in sensors monitor the ambient temperature. When the temperature is low, the unit starts an automatic defrost cycle to prevent frost buildup. The compressor stops during the cycle while the fan keeps running so the frost can thaw. Normal operation resumes when the cycle ends.

Model

Sentinel HD90

Capacity

198 PPD at saturation; 90 PPD at AHAM

Coverage

Up to 2,600 sq. ft.

Efficiency

2.69 L/kWh

Air flow

210 CFM (350 CMH)

Drain pipe

1.3 ft (40 cm)