AlorAir
Model comparison
Sentinel HD55S vs Sentinel HD55P
A source-backed comparison of the AlorAir Sentinel HD55S and Sentinel HD55P, focusing on verified specifications, pump configuration, drainage setup, and manufacturer-reported capacity claims without declaring a universal winner.
Verified side-by-side specs
AlorAir
Sentinel HD55P
Capacity and coverage values are manufacturer-reported specifications. Manufacturer maximum coverage is not a DrySpace sizing recommendation.
Maximum/saturation removal
Sentinel HD55S
120 pints/day
Sentinel HD55P
120 pints/day
AHAM removal
Sentinel HD55S
55 pints/day
Sentinel HD55P
55 pints/day
Airflow
Sentinel HD55S
130 CFM
Sentinel HD55P
153 CFM
Manufacturer-reported maximum coverage
Sentinel HD55S
1,300 sq ft
Sentinel HD55P
1,300 sq ft
Built-in pump
Sentinel HD55S
No
Sentinel HD55P
Yes
Drainage
Sentinel HD55S
Gravity drainage
Sentinel HD55P
Built-in condensate pump
Drain hose
Sentinel HD55S
Not verified
Sentinel HD55P
19.6 ft
Operating temperature
Sentinel HD55S
33.8-104 F
Sentinel HD55P
Not verified
Dimensions
Sentinel HD55S
19.2" L x 12.2" W x 13.3" H
Sentinel HD55P
Not verified
Filter
Sentinel HD55S
MERV-1
Sentinel HD55P
Not verified
Weight
Sentinel HD55S
41.7 lb
Sentinel HD55P
Not verified
Voltage
Sentinel HD55S
Not verified
Sentinel HD55P
Not verified
Energy Star
Sentinel HD55S
Not verified
Sentinel HD55P
Not verified
Integrated Energy Factor
Sentinel HD55S
Not verified
Sentinel HD55P
Not verified
Warranty
Sentinel HD55S
6-year limited; first 2 years full coverage
Sentinel HD55P
Not verified
Key differences
Airflow
Sentinel HD55S
130 CFM
Sentinel HD55P
153 CFM
Built-in pump
Sentinel HD55S
No
Sentinel HD55P
Yes
Drainage
Sentinel HD55S
Gravity drainage
Sentinel HD55P
Built-in condensate pump
Drainage and pump configuration
Sentinel HD55S
- Built-in pump
- No
- Drainage
- Gravity drainage
- Drain hose
- Not verified
Sentinel HD55P
- Built-in pump
- Yes
- Drainage
- Built-in condensate pump
- Drain hose
- 19.6 ft
Which configuration may make more sense?
Buyers who need condensate pumped upward or away from the unit may prefer Sentinel HD55P. Buyers with a suitable nearby gravity drain may not need a built-in pump and may consider Sentinel HD55S.
The practical choice depends on the installation location, hose route, discharge point, and whether gravity can reliably carry condensate away from the crawl space.
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
Sentinel HD55P verification
Specs last verified: 2026-09-05
- Operating current and estimated power draw are not populated because the current official AlorAir spec sheet conflicts internally, listing both 3.51 A and 3.1 A.