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The need for efficient dehumidification is not just restricted to neither construction work, water damage, production processes, swimming pools and waterworks and other obviously damp areas. Buildings, valuables and people in all sorts of climates will often benefit from dehumidification in less obvious everyday situations. The outdoor air is never completely dry anywhere in the world, and indoors multiple sources add to the relative humidity of the indoor air: transpiration from people; steam from cooking and bathing; humidity emanating from production processes or the storage of damp goods; even building materials and furniture slowly drying out add to the overall humidity of a room. Due to ever rising energy prices, buildings are much better insulated than before. The insulation might keep out the cold, but it also reduces the air change and traps humidity. A sure sign is dew on on windows, which can easily turn into moisture causing damage to the woodwork.
Water is always in the air, inside and outside the home. The amount inside the home varies and is increased by many routine daily life activities such as cooking, washing, showering, making tea and breathing. If you have uncovered water containers in the home like fish tanks etc, then these will also add to the amount of water in the air.
Condensation principleDanVex dehumidifiers work by drawing air from the room over a coil cooled to a very low temperature by a refrigeration system. These are commonly known as refirigeration dehumidifiers ( Domestic, Swimming pool, Industrial, Stationary series ). The water vapor condenses on the cold surface and the liquid water drips into the water collection bucket underneath. 

adsorptionAn alternative method known as desiccant dehumidifiers ( Adsorption series ). The desiccant dehumidifiers pass the air over a wheel coated with a water absorbing material ( called desiccant). The water is removed from the desiccant by passing a stream of warm air through it whereby it is dried and re-generated to collect more moisture on its next pass.