Best Overall
Eva-Dry EDV-4000H Rotary Desiccant Dehumidifier
Our verdict: A rotary desiccant unit cold-rated to 34 degrees, with no compressor or refrigerant.
The Eva-Dry EDV-4000H is a rotary desiccant dehumidifier cold-rated to 34 degrees Fahrenheit, listed for garages and similar spaces and covering up to 444 square feet. It uses no compressor and no refrigerant, so it has no cycling noise and no coil to ice up in a cold room.
It ranks first because cold performance is the reason to buy desiccant at all, and this is the only unit here that states a temperature floor. The Ivation 19 Pint removes more moisture on paper, but the Eva-Dry's 34 degree rating suits unheated spaces where the others make no promise. It sits in the $200 to $500 bracket with the Ivations.
Buy it for a garage, a boat storage room or a crawlspace that stays cold in winter. The caveat is coverage: 444 square feet is modest, so a large open basement needs a bigger unit or two.
- Type
- Rotary desiccant
- Low temperature
- Rated to 34 degrees F
- Coverage
- Up to 444 sq ft
- Price bracket
- $200 to $500
What we like
- +Rated down to 34 degrees
- +No compressor or refrigerant
- +No cycling compressor noise
- +Suited to garages
Watch out for
- −444 sq ft coverage is modest
- −Top price bracket
- −Desiccant units warm the room
Buy it if: Cold garages, storage rooms and crawlspaces where compressor units stall.
Skip it if: Your space stays warm and you want the lowest energy bill.




