When air is cooled down, it can not hold as much moisture. The air contracts, like squeezing a sponge. The moisture is forced out of the air and will eventually condense onto a surface as liquid water. That is what happens inside a dehumidifier or an air conditioner.
The air passes over the cool condenser coils and is itself cooled down. In a dehumidifier, the drain bucket usually has a float that will trigger a shut-off switch to prevent the bucket from overflowing. Some dehumidifiers use gravity-fed hoses or even pumps to automatically remove the water. Either way, the water is removed from the air, and the less-humid air is returned to the room. Modern dehumidifiers have a humidistat that lets you set a specific humidity level 30 to 50 percent is typically suitable for most homes.
The humidistat will automatically shut off the dehumidifier when the humidity reaches the set point, then reactivate it when the humidity rises. However, the best choice can be affected by the type of room you are looking to reduce humidity in. In general, the square feet of the space, how damp the room gets and whether it will operate in temperatures below 65 degrees may impact what kind of dehumidifier is best for your needs.
Another major consideration when buying a dehumidifier is capacity measured in how many pints of water the unit can extract from the air over 24 hours. Energy star has a helpful guide that shows what capacity of dehumidifier you need, which is based on the 1 size of the space and 2 how damp or wet are the conditions of the room Obviously, a larger, wetter space will require a more heavy-duty dehumidifier.
Below are some estimates for reference. If the space you need to dehumidify has an air temperature below 65 degrees, you may need a dehumidifier with special features to prevent frost from forming on the condensing coils. These dehumidifiers have an anti-frost sensor that will shut the device down temporarily to prevent frost from building up. If temperatures generally go below 65 degrees in your basement, it is a good idea to consider the anti-frost sensor mentioned above.
Frost can impair the performance of the unit by causing the compressor to turn on and off without really removing the moisture from the air. You should also be considering a model with a hose attachment feature. This allows you to connect a hose and direct the other end to a floor drain or sump pump, allowing the dehumidifier to keep working without you having to empty the bucket — especially if the may need to be continuously dehumidified through a period of excessively humid months.
Attics and crawl spaces can present challenges for removing humidity, but it is crucial to dehumidify those spaces to prevent mold and wood rot. For a large attic, a regular compressor dehumidifier is a good solution. For smaller enclosed spaces, there are lower capacity dehumidifiers that can do the job as long as you can get an extension cord into the space. For really tight or tiny crawl spaces, using a desiccant might be your only option in lieu of using a dehumidifier.
For rooms with specific moisture problems, like kitchens and bathrooms, air conditioning will help, but those rooms really should have a vent with a fan to divert moisture outside the house. Moisture buildup in poorly ventilated bathrooms is a common source of household mold. However, if there is no fan that exhausts to the outside, or a window that can be opened, a dehumidifier may be a good option to remove excess moisture in the bathroom.
It is essentially a bucket or dish filled with a substance that can absorb large amounts of moisture. When the desiccant substance is saturated, it stops working, so it needs to be replaced or refilled. Much like your glass of ice water, the coils are colder than the air that is immediately around them. As air cools, its ability to hold and retain moisture drops, and when the air has more moisture than it can hold, it forms that familiar condensate. Dehumidifiers typically have a drip pan or a removable bucket where the condensate collects for easy disposal—some dehumidifiers are also equipped with a built-in pump for worry-free, continuous drainage.
How does a dehumidifier work? Primary Menu. Conditions like pneumonia can actually become worse if the air is made too dry. Your skin and hair can be affected, too, if your home becomes an arid place. People with eczema atopic dermatitis may be especially prone to flare-ups in a dry environment. When you use a dehumidifier, you might need to be especially mindful of staying hydrated. If you have a dry cough or stuffy nose, running a dehumidifier might do more harm than good, too.
Dehumidifiers work best in areas where damp air collects, like basements. Signs you might want to consider buying a dehumidifier include:.
You can buy a dehumidifier at almost any home supply retailer or home improvement store. Appliance stores and department stores also tend to keep them in stock. You may also want to figure out the energy costs associated with the appliance before you purchase it. Buy a dehumidifier online. A dehumidifier does have some established health benefits. The main benefit is reducing the presence of allergens and irritants in damp areas of your home.
Dehumidifiers are accessible and easy to purchase. Giving one a try might make a difference in the comfort level you experience at home. A humidifier may help asthma symptoms in certain situations, but can also exacerbate symptoms if there is too much moisture in the air.
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