Q&A: What should I look for in a new dehumidifier?

Our old dehumidifier just took its last gasp. We've had a very wet summer and need to get a replacement ASAP. What should we look for when shopping for a new dehumidifier?

A dehumidifier can make your home more comfortable and keep it free of mold. Here's how to find model that's quiet, efficient, and effective. (As we recently reported, now might be the right time to buy new appliances.)  

First, decide on the size of the dehumidifier you need. Our latest report on dehumidifiers (ratings available to subscribers) covered small-, medium-, and large-capacity models. Small-capacity units have a claimed removal rate of about 25 to 40 pints per day; medium-capacity, 40 to 50; and large-capacity, 50 to 75. Learn more about dehumidifier capacity.

Keep in mind that the higher the capacity you choose, the noisier the dehumidifier will likely be. Tested models of all sizes ranged from 55 decibels (the level of loud conversation) to 67 decibels (street traffic). Look for a model with a larger tank—the bigger it is, the less often you'll have to empty it.

Also consider a dehumidifier that has a hose attachment. That setup eliminates your having to empty the reservoir. One model we tested from DeLonghi can pump water upward and outward through a window or other port. And using our ratings, choose a model that earned at least a good score for humidistat accuracy. (Optimal relative humidity is 30 to 50 percent.)

Our tests also found that DampRid disappoints. The manufacturer claims this product, which uses calcium-chloride crystals to remove moisture from the air, will lower humidity to about 50 percent in spaces up to 1,000 square feet. But those claims didn't hold water: A large bucket of DampRid crystals removed only 2 ounces of moisture from the air after 24 hours in our test chamber.—Gian Trotta | e-mail | Twitter | Forums | Facebook

Essential information: Even the best dehumidifier might not help with moisture problems linked to structural flaws. Try these fixes to keep your basement drier. Find out which dehumidifiers other readers use in the air conditioner, air purifier, and dehumidifier topic in our appliances forums. And read about the Cool Surge portable air cooler, which is essentially an evaporative, or swamp, cooler.