Dehumidifiers

Compressor, desiccant and closet dehumidifiers:

for a whole bedroom in Guápiles, the machine that does the work is a compressor unit. Damp air passes over a cold coil and drips into a bucket, and it performs best in a warm room. A desiccant model uses a drying wheel instead, so it keeps going in a chilly room in Zarcero where a compressor coil would frost over, at the cost of more power and a little added warmth. For one wardrobe or a car, a thermoelectric box or a tub of moisture-absorbing crystals is enough, and the tub only ever costs its refill. If the room is hot as well as damp, a unit from airconditioning units takes water out while it cools. Dust and smoke are a job for an air purifier, and a room that only feels stuffy may just need a fan.

Pints per day and the label that changed:

capacity is the US pints of water removed in 24 hours under a lab test, and labels from 2020 on use a cooler test. The machines did not get weaker, only the numbers did: an older unit sold as 50 pints matches a new one sold as 30 to 35, so a second-hand “70-pint” is nowhere near twice a new 35. Many labels print both figures; when only one appears, the year on the sticker tells you which test it is.

Bucket, hose or pump, for a house left shut:

in a really damp room the bucket fills within a day and the unit switches off. For a cabin near La Fortuna left closed while the owners are away, look for a hose outlet that drains by gravity to a floor drain, or a built-in pump that lifts water to a sink or a window, plus a humidity setting and auto-restart after a power cut. Without those, it stops on the first day.

A used dehumidifier against the new one it really matches:

a new compressor unit of around 35 pints costs roughly ₡120,000 to ₡180,000. Make your offer against the new model a used one actually equals, not the number on its front, and offer less again when the sticker shows no readable date.

The sticker, the coil and the float switch:

start with the label on the back. Millions of dehumidifiers made by Gree up to 2014 and sold under names including Frigidaire, GE, Kenmore, Danby and De’Longhi were recalled in the US for overheating, and the model number and date code settle whether a unit is on that list. Browned or warped plastic near the back or the cord is a reason to walk away. Then let it run: frost creeping over the coil in a warm room means low refrigerant or a clogged filter, and a rattle that grows as it warms is the fan motor. Slide the bucket half out and the unit should stop; that float is all that keeps the floor dry. A cheap hygrometer beside it shows whether the humidity display is honest.

A dehumidifier left over once the leak is fixed:

that is how most of these come up, after a roof in Tibás is repaired, the gutters are cleared or a family leaves a damp ground-floor flat. Photograph the back sticker with the model number and date code readable, and give the pint rating with the test it belongs to. Say whether the drain hose comes with it, whether there is a pump, and what humidity it holds a closed room at. Whoever collects it should carry it upright with the bucket empty, and if it rides on its side, let it stand a few hours before switching on so the compressor oil settles.