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Desiccant dehumidifiers allow you to achieve humidity levels as low as 5 or 10% which may be needed for special applications. Dessicant dehumidifiers do not remove the moisture from the air by using a refrigeration system. Air is drawn in from the room and passes through what is called a desiccant wheel containing a highly absorbent material like silica where it is able to draw the moisture from the air. This dried air is then circulated back into the room out the other side. Since there is no refrigeration system used, the moisture can be removed regardless of the air temperature or humidity. The only other thing that is necessary for this kind of dehumidifier to be efficient is that the desiccant wheel needs to be regenerated, so it can continue to absorb more moisture from the air. The way this is done is to circulate air from the opposite direction that has been heated in some fashion through the wheel, so the heat and moisture removed can be exhausted to the outside. Because of how a desiccant dehumidifier works it is both expensive and more difficult to install. We recommend Novel-Aire desiccant dehumidifiers.
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Currently, NovelAire dehumidifiers are our recommended brand of desiccant dehumidifiers. Novelaire desiccant dehumidifiers use a revolutionary new process to remove moisture at exceptionally low temperatures without the freeze up problems inherent with refrigerant dehumidifiers. The heart of these dehumidifiers is a desiccant wheel. Air from the room is drawn in through a rotating desiccant wheel. The silica gel desiccant adsorbs the moisture from the air and then the bone dry air is returned to the room. Then the moisture containing portion of the wheel rotates into the regeneration section where the desiccant releases the moisture it had just adsorbed earlier into the heated regeneration air stream, where it is then exhausted to the outside of the building. This allows the desiccant wheel to regenerate itself on a continual basis, so it can continue to adsorb moisture from the incoming air. Some Novelaire dehumidifiers are combined with central air conditioning units for perfect home or light commercial humidity control. The Novelaire desiccant dehumidifiers are far from inexpensive but they are excellent quality and provide a whole house solution.
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