A dehumidification system, comprising: a compressor; a primary evaporator and a primary condenser; and a secondary evaporator and a secondary condenser, wherein: the secondary evaporator is operable to receive an inlet airflow and output a first airflow, the first airflow comprising cooler air than the inlet airflow, the first airflow generated by transferring heat from the inlet airflow to a flow of refrigerant as the inlet airflow passes through the secondary evaporator; the primary evaporator is operable to receive the first airflow and output a second airflow, the second airflow comprising cooler air than the first airflow, the second airflow generated by transferring heat from the first airflow to the flow of refrigerant as the first airflow passes through the primary evaporator; the secondary condenser is operable to receive the second airflow and output a third airflow, the third airflow comprising warmer and less humid air than the second airflow, the third airflow generated by transferring heat from the flow of refrigerant to the third airflow as the second airflow passes through the secondary condenser; the primary condenser is operable to receive the third airflow and output a dehumidified airflow, the dehumidified airflow comprising less humid and warmer air than the third airflow, the dehumidified airflow generated by transferring heat from the flow of refrigerant to the dehumidified airflow as the third airflow passes through the primary condenser; and the compressor is operable to receive the flow of refrigerant from the primary evaporator and provide the flow of refrigerant to the primary condenser; and characterized in that the dehumidification system is configured to cause the refrigerant to evaporate twice and condense twice in one refrigeration cycle. a compressor; a primary evaporator and a primary condenser; and a secondary evaporator and a secondary condenser, wherein: the secondary evaporator is operable to receive an inlet airflow and output a first airflow, the first airflow comprising cooler air than the inlet airflow, the first airflow generated by transferring heat from the inlet airflow to a flow of refrigerant as the inlet airflow passes through the secondary evaporator; the primary evaporator is operable to receive the first airflow and output a second airflow, the second airflow comprising cooler air than the first airflow, the second airflow generated by transferring heat from the first airflow to the flow of refrigerant as the first airflow passes through the primary evaporator; the secondary condenser is operable to receive the second airflow and output a third airflow, the third airflow comprising warmer and less humid air than the second airflow, the third airflow generated by transferring heat from the flow of refrigerant to the third airflow as the second airflow passes through the secondary condenser; the primary condenser is operable to receive the third airflow and output a dehumidified airflow, the dehumidified airflow comprising less humid and warmer air than the third airflow, the dehumidified airflow generated by transferring heat from the flow of refrigerant to the dehumidified airflow as the third airflow passes through the primary condenser; and the compressor is operable to receive the flow of refrigerant from the primary evaporator and provide the flow of refrigerant to the primary condenser; and characterized in that the dehumidification system is configured to cause the refrigerant to evaporate twice and condense twice in one refrigeration cycle. the secondary evaporator is operable to receive an inlet airflow and output a first airflow, the first airflow comprising cooler air than the inlet airflow, the first airflow generated by transferring heat from the inlet airflow to a flow of refrigerant as the inlet airflow passes through the secondary evaporator; the primary evaporator is operable to receive the first airflow and output a second airflow, the second airflow comprising cooler air than the first airflow, the second airflow generated by transferring heat from the first airflow to the flow of refrigerant as the first airflow passes through the primary evaporator; the secondary condenser is operable to receive the second airflow and output a third airflow, the third airflow comprising warmer and less humid air than the second airflow, the third airflow generated by transferring heat from the flow of refrigerant to the third airflow as the second airflow passes through the secondary condenser; the primary condenser is operable to receive the third airflow and output a dehumidified airflow, the dehumidified airflow comprising less humid and warmer air than the third airflow, the dehumidified airflow generated by transferring heat from the flow of refrigerant to the dehumidified airflow as the third airflow passes through the primary condenser; and the compressor is operable to receive the flow of refrigerant from the primary evaporator and provide the flow of refrigerant to the primary condenser; and characterized in that the dehumidification system is configured to cause the refrigerant to evaporate twice and condense twice in one refrigeration cycle.