A method of using an ice therapy machine involves replacing water with windshield washer fluid containing ethanol or ethylene glycol, and placing the main unit of the ice therapy machine, including the ice chest and pump, in a freezer to prevent the ice in the ice chest from melting. The freezer has been modified to include openings for passage of the fluid-circulating tubes of the ice therapy machine, and an opening for the power cord of the ice therapy machine, which supplies power to the pump. Alternatively, the door of the freezer may be replaced by an insulated panel having openings for the coolant circulating tubes and power cord. An on/off switch may be installed in the power cord so that the pump can be turned on and off without having to open the freezer door.