Best for
- Crawl spaces and basements in the 55-pint AHAM class
- Buyers choosing between gravity-only drainage and an integrated pump
- Installations where equipment dimensions and sound matter
Watch for
- Treating “120 pints saturation” as the same as AHAM capacity
- Sizing only from square feet instead of moisture load
- Buying a pump model when a reliable gravity drain is already available
The headline capacity is effectively a tie
AlorAir currently rates the Sentinel HD55S at 55 pints/day under AHAM 80°F/60% RH conditions and 120 pints/day at saturation. Argendon publishes the same 55-pint AHAM and 120-pint saturation class for the Sandidry 55C. That means the better decision comes from installation details rather than nominal extraction capacity.
Drainage is the clearest architectural difference
The current AlorAir HD55S specification lists gravity drainage. Argendon publishes both gravity drainage and an integrated condensate pump with a 19.6-foot pump hose. If the installation cannot maintain a continuous downhill drain, the pump can eliminate a separate condensate-pump purchase.
If a floor drain or sump is already below the unit, gravity drainage is simpler and removes one pump from the failure chain.
AlorAir publishes lower sound and slightly higher efficiency
AlorAir lists 130 CFM airflow, under 50 dBA on the current product page, and a COP of 2.4 L/kWh. Argendon lists 153 CFM, 57 dBA and 2.3 L/kWh. Manufacturer methods can differ, so treat those figures as product specifications rather than a controlled independent noise or energy test.
Fit is not identical
AlorAir lists 19.2 × 12.2 × 13.3 inches and about 41.7 lb on its current page. Argendon lists 17.64 × 11.69 × 11.85 inches and 44.53 lb. Measure service access, ducting and drain routing rather than choosing from footprint alone.
Decision rule
Choose AlorAir first when gravity drainage works, lower published sound matters and the Sentinel footprint fits. Choose Argendon when the built-in pump solves a real drain-height problem or the shorter enclosure fits better. For either unit, fix bulk water intrusion and air leakage before expecting a dehumidifier to compensate for a building problem.
Use the same basis across brands. Room-size claims, operating-cost assumptions and moisture ratings can use different methods. Normalize the inputs before comparing products.