The Gaymar Medi-Therm device provides a means of regulating patient temperature by supplying temperature-controlled water through a connector hose to accessory Gaymar Hyper/Hypothermia blanket(s)/body wrap(s). The blanket/body wrap provides an interface for heating or cooling the patient. Accessory YSI 400 series patient probe interfaces between the || Medi-Therm and patient to sense patient temperature, which is displayed on the device's control panel. The Medi-Therm device controls output water temperature by mixing hot and cold water using hot and cold solenoid valves under microprocessor control. The device includes a circulating pump, heater and refrigeration system. || The Medi-Therm controller, connector hose, blanket/body wrap and patient probe comprise the Medi-Therm Hyper/Hypothermia System.