What factor can greatly affect the efficiency of heat transfer in an electric furnace?

The efficiency of heat transfer in an electric furnace can be significantly influenced by the placement of temperature probes. Properly placed temperature probes allow for accurate readings of the air or fluid temperature within the system. These readings help to ensure that the furnace operates at optimal conditions, making necessary adjustments to maintain the desired temperature efficiently. If the probes are not positioned correctly, it may lead to inaccurate temperature readings, which can cause the furnace to run inefficiently, overheating, or underheating the space it is designed to serve.

While factors such as fuel type, location of the furnace, and maintenance frequency are important in broader HVAC system performance, they do not directly influence heat transfer efficiency in the same way that temperature probe placement does. The heat transfer in an electric furnace relies on accurate temperature control to maximize efficiency and comfort.