"The Marine Corps Systems Command supports and fields a number of tactical environmental control units (ECUs) in various sizes that provide (heating, ventilation, air conditioning, and dehumidification) for soft wall (tents) and rigid wall shelters, as well as Small and Large Field Refrigeration Systems and a unique Cooling and Refrigeration Tool Kit.  These systems consist of primarily commercial components, use EPA-compliant refrigerants, and are ruggedized to perform in extreme operating conditions."

Download Characteristics of All Current Environmental Control Equipment