Condensing dehumidifiers work well in warm temperatures and mid-range humidity levels (>20°C and >40%RH) making them a popular choice for vertical farm dehumidification. Moisture removed from the air can be returned to the agricultural cycle as liquid water and the heat energy produced during drying can also offset any heating requirement in the space. Dehumidifiers such as the Condair DC-N, with remote condensers, allow excess heat to be remotely exhausted outside when upper temperature level is met in the space. This avoids overheating an area due to the heat generated from the drying process or needing to ventilate to control temperature.
Desiccant dehumidifier systems offer a wider operational range than condensing systems, typically -30 to +40°C together with operational ambient humidity from 0-100%RH. They can maintain very dry conditions, at less than 10%RH even at low temperatures. However, as the absorbed moisture is vented outside via a warm air duct, there is no liquid water that can be recovered.