Florida Home Inspector Practice Test 2025 – Comprehensive Exam Prep

The ideal temperature differential at the air return handler of a heating system in heating mode is typically within the range of 10 to 15 degrees Fahrenheit. This differential indicates the effectiveness of the heating system in delivering warm air to the living spaces while ensuring that the return air is adequately circulating back to the system for reheating.

A differential within this range suggests that the system is operating efficiently, moving the air effectively and maintaining comfort levels in the home. If the differential is too low, it may indicate that the system is not heating properly, potentially due to issues such as inadequate airflow or a malfunctioning heat source. Conversely, a differential that is too high may suggest that the system is working harder than necessary, which can lead to increased energy consumption and wear on the components. Therefore, aiming for a differential of 10 to 15 degrees is optimal for ensuring both comfort and efficiency in a heating system.