High temperature refrigeration is that produced by ______.

High temperature refrigeration is primarily produced by an air-conditioning system. In this context, refrigeration refers to the process of removing heat from a designated space to lower its temperature. Air-conditioning systems are specifically designed to absorb heat from indoor environments and expel it outside, thereby providing a cooling effect. These systems can effectively manage temperature in residential, commercial, and industrial applications by utilizing various refrigerants and coils to achieve the desired cooling performance.

The other options focus on activities or components that do not primarily produce high temperature refrigeration. For instance, heat from a furnace generates warmth, not cooling. The vegetable cooling system of a refrigerator is designed to maintain a relatively low temperature but is not defined as a high-temperature refrigeration process. Similarly, the freezer section of a refrigerator operates at low temperatures to preserve food but does not involve high temperature refrigeration. Thus, the air-conditioning system is the most accurate and relevant source of high temperature refrigeration in the choices provided.