Small Dehumidifier Checks for Closets and Wardrobes

What to look for in a closet dehumidifier

When shopping for a dehumidifier for a closet or wardrobe, the first words on a listing tell you the size and capacity group. Small units are often labeled with a low pints per day figure, such as 20 or 30 pints, but the exact number depends on the measuring standard the seller uses. The DOE test procedure for portable dehumidifiers was updated in 2019, and capacities reported under the new standard are lower than older ratings. Read the listing to see which figure is stated, and check the maker's page for the conditions under which it was measured.

Auto shutoff is a common feature on small dehumidifiers. It means the unit stops when the water tank is full, so you do not have to worry about overflow. The ENERGY STAR buying guidance notes that most portable dehumidifiers use a removable bucket and have an automatic shutoff when the bucket is full. Look for this term in the listing title or bullet list. If the unit has a continuous drain option, you can connect a hose to direct water to a floor drain, but that requires a drain nearby and a hose that fits the fitting. For more on drainage, see the drain options article.

Reading moisture removal rates on listings

Pints per day is the standard way dehumidifier capacity is stated. The DOE defines capacity as the amount of water removed per day at test conditions, reported in pints per day. On a listing, you may see one figure or two, especially if the seller mentions both the old and new test standards. The ENERGY STAR page on testing and capacity explains that the new test procedure uses cooler conditions, so a unit tested to the new standard will likely report a smaller capacity than one tested to the old procedure. Do not convert between standards; just read what the listing states.

For a closet or wardrobe, a small unit with a lower pints per day figure is usually enough, but the figure is a label, not a promise of how fast it will dry the space. The site cannot say how many pints a closet needs or how quickly a unit will remove moisture. Use the pints per day figure to compare listings within the same capacity group, and read the maker's page for the test conditions. The ENERGY STAR buying guidance includes a chart that suggests capacity ranges for rooms of different sizes and dampness, but that chart is for general guidance, not a guarantee for a closet. For more on capacity, see the capacity versus square footage article.

Types of small dehumidifiers

Small dehumidifiers come in three main types: compressor, desiccant, and Peltier (thermoelectric). The listing may name the type or not. Compressor units use a refrigerated coil and are common for room dehumidifiers. Desiccant units use a moisture-absorbing material and are often chosen for cooler spaces. Peltier units are small and quiet but have lower capacity. The site does not read Peltier units in its guides, so if a listing says thermoelectric, check the maker's page for details. For a comparison of compressor and desiccant types, see the compressor versus desiccant article.

The type affects where the unit works best. Compressor units may have a stated operating temperature range; the ENERGY STAR guidance notes that frost can form on coils below 65 degrees Fahrenheit, and some units have an anti-frost sensor. Desiccant units can work at lower temperatures. For a closet inside a heated home, temperature is usually not an issue, but if the closet is in an unheated garage or attic, read the maker's stated operating range. The site cannot say which type is better for a specific closet; that is a question for the maker's page. For more on low-temperature operation, see the low temperature operation article.

Placement and care for a closet unit

Place the dehumidifier according to the manual. Keep clearance around the unit so air can flow, and place it on a level surface. Do not block the vents. The manual will describe how to clean the filter and empty the bucket. Some units have a washable filter; others need replacement. Read the listing for filter type and check the maker's page for cleaning instructions. For more on filter care, see the filter types and maintenance article.

For a wardrobe, a small unit can sit on a shelf or the floor, but the manual may specify a minimum clearance. Do not place it on a soft surface that could block airflow. If the unit has a continuous drain hose, route it to a floor drain as the manual describes. If you use the bucket, empty it when the full indicator lights up. The auto shutoff prevents overflow, but the bucket still needs emptying. For more on placement, see the placement tips article.

What this site cannot say about closets

This site cannot promise that a dehumidifier will prevent mold, mildew, or odors in a closet. Mold control is about moisture control, and the EPA and CDC provide guidance on mold prevention and cleanup. Read the EPA mold pages and the CDC mold page for that information. This article does not summarize their guidance.

The site also cannot say how long a unit will take to dry a closet, what humidity level it will reach, or how much energy it uses. Those are measured claims that require data the site does not have. Read the listing for stated details and the maker's page for specifications. For energy use, look for the ENERGY STAR mark, which is a program that certifies efficient models. The ENERGY STAR page explains that certified models use 20% less energy than conventional units, but the site cannot give a running cost. For more on ENERGY STAR, see the Energy Star requirements article.

What to pick for your situation

Questions

What does auto shutoff mean on a dehumidifier?

Auto shutoff means the unit stops when the water tank is full, so it does not overflow. Most portable dehumidifiers have this feature, according to ENERGY STAR. Look for it in the listing title or bullet list.

How do I read the pints per day figure on a listing?

Pints per day is the capacity stated by the seller, based on a test procedure. The DOE updated the test in 2019, so newer ratings are lower than older ones. Read the figure as a label, not a promise of drying speed, and check the maker's page for test conditions.

Can I use a regular dehumidifier in a wardrobe?

A small dehumidifier can fit in a wardrobe if it has enough clearance for airflow. Read the manual for placement instructions. Do not block vents, and keep the unit on a level surface.

What is the difference between compressor and desiccant dehumidifiers?

Compressor units use a refrigerated coil, while desiccant units use a moisture-absorbing material. Desiccant units can work at lower temperatures. The listing may name the type; if not, check the maker's page.

Does a dehumidifier prevent mold in a closet?

This site cannot promise that. Mold control is about moisture control, and the EPA and CDC provide guidance on mold prevention. Read their pages for that information.