A cyclone is disclosed that includes an enclosure that encloses at least a portion of the cyclone. The enclosure delimits an enclosed volume between an interior surface of the enclosure and the exterior surface of the body. The enclosure retains a gas coolant or liquid coolant in thermal exchange with the enclosed exterior surface of the cyclone. A powder coating system is disclosed that includes a spray booth and a cyclone, where ambient air is added to process air that is drawn from the spray booth into the cyclone. The ambient air may be added to the process air to cool the process air to a temperature that is lower than the process air would be if ambient air were not added, and also may be used to dilute the powder overspray entrained process air.