Don Vandervort, Head Homeboy, has written more than 30 DIY home improvement books, been a segment host on HGTV, served as MSN.com's home improvement expert and written countless magazine articles.
There are three common types of home dehumidifiers: heat pump dehumidifiers, chemical absorbent dehumidifiers, and dehumidifying ventilators. Each has its advantages.
Heat pump dehumidifiers extract water from the air by using a heat pump that is similar to an air conditioner pump. First, a fan pulls the indoor air across a very cold coil, which causes the moisture to condense. The droplets drip into a bucket inside the unit. The dry air is warmed by a second, heated coil and exhausted at room temperature. These dehumidifiers are considered among the most effective.
Chemical absorbent dehumidifiers work best in warm climates. They use a chemical drying agent, or desiccant, on a heat exchange wheel to absorb water molecules from the air. Damp air is sent outside via vents. Desiccant dehumidifiers use a lot of energy. They are more commonly used by industries than homeowners.
Dehumidifying ventilators have a sensor controller and exhaust fan. The sensor controller activates the unit when humidity reaches a specified level. Dehumidifying ventilators are less effective in muggy climates because they draw outside air into the house. These dehumidifiers often are used in basements. But they can depressurize a room and cause gas spillage. Make sure gas furnaces are properly vented.
