Desiccant or compressor?

Two different mechanisms

A compressor dehumidifier is a refrigeration circuit. It chills a coil below the air's dew point, water condenses onto it and drains away. Its performance depends entirely on being able to get that coil colder than the dew point without freezing it, which is a harder ask the colder the room gets.

A desiccant unit has no cold coil. Air passes through a rotor coated in a water-absorbing material; a heater then drives the moisture back out of the rotor and it condenses in a separate stream. There is nothing to freeze, and the process works essentially the same at 40F as at 70F.

The crossover

What the desiccant costs you

• It heats the room. Not incidentally - the heater is how it works. In a cold garage that is a small bonus. In a warm basement in August it is exactly wrong and it fights the air conditioning upstairs.
• Efficiency at normal temperatures. A resistive heater is a blunt instrument compared with a refrigeration circuit. In the temperature range where both work, the compressor moves more water per kilowatt-hour.
• No published efficiency figure at all. Desiccant units are not represented in the ENERGY STAR certified dehumidifier list, which covers compressor portables and whole-home units. That means there is no IEF to compute a wattage from, and neither Ivation model in our registry publishes one.
• Capacity. The desiccant units here are rated 13 and 19 pints a day against a compressor's 50. In a warm room that is a large gap.

What the compressor costs you

Everything below about 50F. And it is worth being clear about how it fails, because it does not fail cleanly - it keeps running, keeps drawing its full 488 watts, and produces steadily less water while spending more of each hour in a defrost cycle. From the outside it looks like a working machine. The bucket tells the truth.

Quick picks

#	Product	Best for	Draw	Price
1	Ivation 19 Pint Desiccant DehumidifierThe only technology here that does not lose to the cold, which makes it the right answer in exactly the rooms where a compressor is the wrong one.	An unheated garage in winter	Not published	Check price on Amazon #ad How we are funded
2	Midea Cube 50 Pint DehumidifierThe only unit here that solves the real basement problem, which is not capacity but where the water goes when you are not standing next to it.	A basement you visit once a month	487 W	Check price on Amazon #ad How we are funded
3	Ivation 13 Pint Desiccant DehumidifierThe small desiccant, for spaces that are cold and enclosed rather than large and damp.	A cold closet, attic or bathroom	Not published	Check price on Amazon #ad How we are funded
4	GE ENERGY STAR 50 Pint DehumidifierThe same 50-pint platform as the pump model with the pump removed, which makes it the cheaper choice when the water can simply run downhill.	A garage or shop with a floor drain	487 W	Check price on Amazon #ad How we are funded

1

Ivation

Ivation 19 Pint Desiccant Dehumidifier

Best for: An unheated garage in winter

The only technology here that does not lose to the cold, which makes it the right answer in exactly the rooms where a compressor is the wrong one.

Average draw

Not published

Not published, and desiccant units are not represented in the ENERGY STAR certified dehumidifier list, which covers compressor portables and whole-home units. Desiccant machines use a resistive heater to regenerate the rotor, so their draw is roughly flat with temperature rather than falling off with it - the opposite trade to a compressor. We will not print a number for this one without a published source.

What is good

• +Keeps extracting at temperatures where a compressor's coil ices and its output collapses
• +No compressor, so it is quieter and lighter than any refrigerant unit here
• +Continuous drain hose included
• +Warm, dry exhaust, which is useful in a cold room and a nuisance in a warm one

What is not

• -No published wattage, and desiccant units are generally less efficient than compressors at normal room temperature
• -410 sq ft coverage - this is a small-space machine
• -It heats the room, which is the last thing a summer basement needs

Who it is for

Unheated garages, boats, sheds and crawl spaces in winter, where a compressor unit spends its time defrosting.

Skip it if

Skip it for a warm summer basement. Above roughly 65F a compressor removes more water per kWh, and the desiccant's waste heat works against you.

2

Midea

Midea Cube 50 Pint Dehumidifier

Best for: A basement you visit once a month

The only unit here that solves the real basement problem, which is not capacity but where the water goes when you are not standing next to it.

Average draw

487 W

Computed from the ENERGY STAR certified entry for Midea MAD50S1QWT-A, the 50 pt / 4,500 sq ft Cube without a pump: 49.67 pt/day at IEF 2.01 L/kWh. Midea's own US product page confirms MAD50S1QWT-A is this configuration. Midea publishes no wattage on the Amazon listing or on that page.

What is good

• +The body separates, so the tank half can sit lower than the compressor half and the hose gets a genuine downhill run
• +Certified at 49.67 pt/day, which is a real 50-pint machine rather than a saturation number
• +IEF 2.01 L/kWh puts it exactly on the median for the 50-pint class - neither a bargain nor a penalty
• +Wi-Fi that tells you it has stopped, which is the only smart feature that matters in a basement

What is not

• -No pump, so the drain has to run downhill the whole way
• -Midea publishes no wattage anywhere, so the 487 W above is computed rather than quoted
• -The 4,500 sq ft coverage claim is marketing, not a spec - see the sizing guide

Who it is for

Someone with a floor drain, a sump, or a window well lower than the machine, who wants to set it once and stop thinking about it.

Skip it if

Skip it if the only drain in the room is higher than the unit. Without a pump, gravity is the entire drainage system, and no setting fixes an uphill hose.

3

Ivation

Ivation 13 Pint Desiccant Dehumidifier

Best for: A cold closet, attic or bathroom

The small desiccant, for spaces that are cold and enclosed rather than large and damp.

Average draw

Not published

Not published. Not represented in the ENERGY STAR certified list, which does not cover desiccant units.

What is good

• +Works in the cold, unlike every compressor unit on this site
• +Small and light enough to move between an attic and a closet
• +Continuous drain hose supported at this size, which the compressor minis do not offer
• +Quiet - no compressor to cycle

What is not

• -270 sq ft is a genuinely small room
• -No published wattage
• -Warms the space it dries

Who it is for

Closets, attics, bathrooms and RV interiors in a cold climate.

Skip it if

Skip it if you need real capacity. Thirteen pints a day is a maintenance machine, not a recovery machine.

4

GE

GE ENERGY STAR 50 Pint Dehumidifier

Best for: A garage or shop with a floor drain

The same 50-pint platform as the pump model with the pump removed, which makes it the cheaper choice when the water can simply run downhill.

Average draw

487 W

Computed from the ENERGY STAR certified entry GE ADSE50X: 49.64 pt/day at IEF 2.01 L/kWh. Same certified platform as the pump variant - removing the pump does not change the DOE capacity or the IEF, so it does not change the computed draw.

What is good

• +Identical certified capacity and efficiency to the pump model at a lower price
• +Clean-filter alert, which is the maintenance nobody remembers to do
• +Auto defrost, so it keeps working in a cold garage rather than icing solid
• +Simple enough to be repairable

What is not

• -Gravity drainage only
• -No published wattage from GE
• -No app or timer if you want scheduled running

Who it is for

A garage, workshop or utility room with a floor drain and no interest in connectivity.

Skip it if

Skip it below about 41F. Every compressor unit on this page loses capacity as the coil approaches freezing - that is when a desiccant machine starts to win.

The practical answer for a four-season climate

No single machine is ideal for a space that is 80F in August and 38F in January, and the honest recommendation is a compromise rather than a product:

1. 1Buy the compressor unit and run it from spring to autumn. That is when most of the moisture problem exists anyway - warm air holds more water, so summer is when a space gains the most.
2. 2Switch it off below about 50F rather than leaving it running and wondering why the bucket is empty. It is not doing much and it is drawing full power to do it.
3. 3Add a small desiccant unit for the winter months if the space genuinely needs to stay dry through them - a workshop with tools, a store with paper, a boat.
4. 4Or heat the space slightly. Bringing a garage to 55F transforms what a compressor unit can do, and depending on your electricity rate that may be cheaper than a second machine.

One thing neither is

A thermoelectric mini unit is a third mechanism and it is not a competitor to either of these. It removes about a pint a day and Pro Breeze states it will not work below 41F, which rules it out of exactly the cold-weather job people buy it for. The mini, reviewed.