The refrigerated type operates very similar to an air-conditioner where it sucks the surrounding air and reduces its temperature making the moisture content of the air to condensed back to its water state so you can purge it. The lower the temperature or the higher the differences between the surrounding air and the evaporator temperature, the dryer the air you’re going to get.
In fact you can as well make use of the air-conditioning unit to dehumidify however it can only function on the room where the unit is mounted and you can’t use it during winter season or you will freeze to death. On the other hand dehumidifiers exhaust both cold and hot air, when merged together provides you the equivalent of the surrounding temperature. You can use it in some other areas without air-conditioner throughout the summer season particularly in the attic and basement. If you want to completely get rid of the moisture content of the entire house you need to have a dedicated system, it work and looks very similar to an air-conditioning device however it is particularly built to remove large volume of moisture.
The other kind of commercial dehumidifier is the desiccant kind, unlike refrigerated type that utilizes Freon to decrease the temperature of the air so as to isolate the moisture content, the desiccant-type uses silica to soak up the humidity from the air. They are more complicated to setup since you need to run a large diameter ducting flexible hose to the outside of the house before you can actually use it, but when setup it can continue to work without any supervision. This type of product is commonly used by restoration contractors thanks to its effectiveness and very fast outcome. It is also best to use in just about any kind of weather condition considering that it doesn’t change the temperature of the surrounding air.
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