AlorAir
Model comparison
Sentinel HD90 vs Sentinel HDi90
A source-backed comparison of the AlorAir Sentinel HD90 and Sentinel HDi90. The verified records match on AHAM capacity, maximum removal, airflow, manufacturer-reported coverage, and dimensions; the primary practical distinction is gravity drainage versus a built-in pump.
Research by Josiah Gavin
Verified side-by-side specs
AlorAir
Sentinel HDi90
Capacity and coverage values are manufacturer-reported specifications. Manufacturer maximum coverage is not a DrySpace sizing recommendation.
Maximum/saturation removal
Sentinel HD90
198 pints/day
Sentinel HDi90
198 pints/day
Rated/AHAM removal
Sentinel HD90
90 pints/day
Sentinel HDi90
90 pints/day
Airflow
Sentinel HD90
210 CFM
Sentinel HDi90
210 CFM
Manufacturer-reported maximum coverage
Sentinel HD90
2,600 sq ft
Sentinel HDi90
2,600 sq ft
Built-in pump
Sentinel HD90
No
Sentinel HDi90
Yes
Drainage
Sentinel HD90
Gravity drainage
Sentinel HDi90
Built-in condensate pump
Drain hose
Sentinel HD90
1.3 ft
Sentinel HDi90
Not verified
Operating temperature
Sentinel HD90
33.8-104 F
Sentinel HDi90
33.8-104 F
Operating humidity
Sentinel HD90
Not verified
Sentinel HDi90
Not verified
Dimensions
Sentinel HD90
23.2" L x 15.2" W x 17.7" H
Sentinel HDi90
23.2" L x 15.2" W x 17.7" H
Filter
Sentinel HD90
MERV-1; optional MERV-8
Sentinel HDi90
MERV-1; optional MERV-8
Refrigerant
Sentinel HD90
Not verified
Sentinel HDi90
Not verified
Sound pressure
Sentinel HD90
Not verified
Sentinel HDi90
Not verified
Weight
Sentinel HD90
67.2 lb
Sentinel HDi90
70.5 lb
Voltage
Sentinel HD90
115V
Sentinel HDi90
115V
Energy Star
Sentinel HD90
Not verified
Sentinel HDi90
Not verified
Integrated Energy Factor
Sentinel HD90
Not verified
Sentinel HDi90
Not verified
Warranty
Sentinel HD90
Not verified
Sentinel HDi90
6-year limited; first 2 years full coverage
What is the same
Maximum/saturation removal
Both models show 198 pints/day in the verified DrySpace product data.
Rated/AHAM removal
Both models show 90 pints/day in the verified DrySpace product data.
Airflow
Both models show 210 CFM in the verified DrySpace product data.
Manufacturer-reported maximum coverage
Both models show 2,600 sq ft in the verified DrySpace product data.
Operating temperature
Both models show 33.8-104 F in the verified DrySpace product data.
Dimensions
Both models show 23.2" L x 15.2" W x 17.7" H in the verified DrySpace product data.
Voltage
Both models show 115V in the verified DrySpace product data.
Key differences
Built-in pump
Sentinel HD90
No
Sentinel HDi90
Yes
Drainage
Sentinel HD90
Gravity drainage
Sentinel HDi90
Built-in condensate pump
Weight
Sentinel HD90
67.2 lb
Sentinel HDi90
70.5 lb
Drainage and pump configuration
Sentinel HD90
- Built-in pump
- No
- Drainage
- Gravity drainage
- Drain hose
- 1.3 ft
Sentinel HDi90
- Built-in pump
- Yes
- Drainage
- Built-in condensate pump
- Drain hose
- Not verified
Which configuration may make more sense?
Buyers who need condensate pumped upward or away from the unit may prefer Sentinel HDi90. Buyers with a suitable nearby gravity drain may not need a built-in pump and may consider Sentinel HD90.
The practical choice depends on the installation location, hose route, discharge point, and whether gravity can reliably carry condensate away from the crawl space.
- Confirm whether the discharge point is below the unit.
- Check whether the hose can maintain a downhill route.
- Identify any section where condensate must move upward.
- Confirm that a suitable drain or sump location is available.
Maximum PPD vs AHAM PPD
Maximum or saturation PPD reflects moisture removal in very humid test conditions. AHAM PPD is a more standardized moderate-condition rating. Both numbers help describe performance, but higher maximum PPD alone does not determine which unit is the better fit for a specific crawl space.
Verification and source links
Continue researching
Compare all verified modelsUse the sizing assistantUnderstand operating-cost inputsUnderstand AHAM vs maximum PPDReview pump vs gravity drainageRead the pump vs gravity drain guideAlorAir Sentinel HD90 product researchAlorAir Sentinel HDi90 product researchCompare AlorAir HD55S vs HD55PCompare Moiswell H150 vs HP150