Which dehumidifier for a cold room and why?

Below about fifteen degrees, a compressor or Peltier dehumidifier loses much of its efficiency. The reason is simple: to create condensation, the compressor's role is to cool the condenser. If the air is too cold, the drops formed on the condenser will freeze. On older products, you can see blocks of ice forming. Today, there are "Defrost" modes that disconnect the compressor, but the device no longer dehumidifies. It is therefore advisable to opt for a desiccant or low-temperature dehumidifier that works with a large silica wheel. Its efficiency will be almost constant at 0°C or à 20°C.