The SP Series unit contains two refrigeration circuits.  One is optimized for dehumidification, the other is optimized for heat recovery and cooling.  The control logic in the machine senses the space requirements and shifts the operation of each circuit and the airflow in the machine to use the most efficient methods to condition the space. 

Direct drive fan arrays, scroll compressors, and heat exchangers that use the refrigerant directly to exchange energy with the air are also important to reducing energy use.  

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