A dehumidifier works on the same principal as a refrigerator. Moisture laden air is drawn into the
dehumidifier and is passed over a cold coil (evaporator). The warm damp air then condenses on the
cold coil into water droplets, which pass into the water container. The air is then passed over the warm
coil (condenser) and is expelled from the dehumidifier.
In cold conditions the water accumulating on the cold coil may freeze. For this reason it
is important that the dehumidifier has a Hot Gas Defrost system. This very simply enables
the dehumidifier to transfer hot gases into the cold coil, thus melting any moisture that
may have frozen. Without a system of this type the dehumidifier must defrost itself (only
achievable when temperatures rise) or employ an expensive to run, heavy and noisy heating
system.
As the dehumidifier lowers the humidity, it will start to remove dampness that has
accumulated in the wall linings, furnishings and bedding. For this reason it is
important to run the dehumidifier constantly for the first few weeks, particularly in
very damp situations. Once the desired humidity levels are reached the dehumidifier
should be used to maintain this humidity level.
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